ML20031B703
| ML20031B703 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 02/28/1981 |
| From: | WESTON GEOPHYSICAL CORP. |
| To: | |
| Shared Package | |
| ML20031B698 | List: |
| References | |
| ISSUANCES-OL, ISSUANCES-OM, NUDOCS 8110050450 | |
| Download: ML20031B703 (67) | |
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SITE SPECIFIC RESPONSE SPECTRA
" ~ "
MIDLAND PLANT - UNITS 1 and 2 l
PARTI RESPONSE SPECTRA - SAFE SHUTDOWN EARTHOUAKE l
ORIGINAL GROUND SURFACE i
i prepared for CONSUMERS POWER COMPANY i
i February 1981 J
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- .7,. 3., a Lif f f Weston Geophysical CORPORATION E
0110050450 810929
[DR ADOCK 050003]O PDP Holt Exhibit 5
1
- d Weston Geophysical coneoac,e~
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i February 26, 1981 l
E Consumers Power ComparJJ 1945 W.
Parnall Road Jackson, Michigan 49201 Attention:
Dr. Thiru R. Thiruvengadam Gentlemen:
In accordance with your Purchese Order No. 37957-Q, we E
submit our final report on the determination of site specific response spectra f or the original ground surf ace at the Midlanr*
Plant - Units 1 and 2.
This is a formal presentation of our findings.
l Sincerely, WESTON GEOPHYSICAL CORPORATION
-o Edward N.
Levine l
for Richard J.
Holt ENL : RJII: slc l
B E
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l Post Office Box 550. Westboro, Massachusetts 01581. (617) 366-9191
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SITE SPECIFIC RESPONSE SPECTRA MIDLAND PLANT - UNITS 1 and 2 PART I l
RESPONSE SPECTRA - SAFE SHUTDOWN EARTHQUAKE ORIGINAL GROUND SURFACE l
prepared for CONSUMERS POWER COMPANY February 1981 5
i 4&
I 5
Weston Geophysical 8
TABLE OF CONTENTS l
1.0 INTRODUCTION
1 2.0 Tile SITE DEPENDENT RESPONSE SPECTRA METilODOLOGY 4
3.0 EVALUATION OF Tile GROUND MOTION POTENTIAL AT Tile MIDLAND SITE 5
3.1 Seismicity 5
3.2 Midland Site Characteristics 6
3.3 Selection of Accelerograms 7
4.0 DERIVATION OF RESPONSE SPECTRA 11 4.1 Description of Selected Data Set 11 4.1.1 Data Base Search 13 4.2 Data Processing 13 4.2.1 Strong-Motion Signal Correction 13 4.2.2 Spectra Derivation 15
4.3 Results
Seismic Response Spectra 15 I
REFERENCES TABLES FIGURES APPENDIX A GEOLOGICAL AND GEOPHYSICAL DESCRIPTION OF STRONG-MOTION RECORDING S'.?ATIONS 5
Weston Geophysical
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LIST OF TABLES Table No.
Title i
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l Station Name and Location for Record Reference Numbers 2
Selected Accelerograms for Midland Nuclear Power Plant i
3 Peak Accelerations for Midland Data Set and Three i
Empirical Studies 4
Number of Response Spectra Ordinates Averaged in Various Period Ranges j
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weston Geoonysicai
LIST OF FIGURES Figure No.
Title 1
Seismicity of Northeastern and North-Central United States and Adjacent Canada 2
Site Characteristics of Midland Nuclear Power Plant Site.
B 3
All Available Strong-Motion Records ML:4.5-6.0;
(
Epicentral Distance 0.-40.
4 Strong-Motion Accelerograms Suitable for Midland Nuclear Power Plant Site, il 5
Comparison of Shear Wave Velocity Columns, Cedar E
Springs Dam Pump House and Gavilan College - Gilroy vs.
{
Midland 6
Comparison of Shear Wave Velocity Columns, Maiano, Italy and Petrolia General Store vs. Midland 7
Comparison of Shear Wave Velocity Columns, El Centro, Ifollistet and Oroville l
Station 7 vs. Midland 8
All Suitable Accelerograph i
Stations vs. Midland With l
Average Velocity Plot 9
Outline of Data Processing Techniques 1
II 11 II l
\\
Weston Geophysical
I LIST OF FIGURES (Cont'd)
I Title Figure No.
10 Overplot of Response Spectra for the Or iqinal Ground I
Surface at Midland Nuclear Power Plant, 11 Median, Mean and 84 th Percentile Response Spectra for the Original Ground I
Surface at Midland Nuclear Power Plant.
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l Weston Geophysical
ll 1.0 _ INTRODUCTION Seismic design values for nuclear power plants are based on two decisions:
first, the selection of the size and location I
of an earthquake which represents a conservative estimate of the source of maximum vibratory motion at the site; second, a conservative assessment of the resulting ground motion at the site, considering the ef fects of the local geologic conditions.
The second assessment is generally provided in terms of a frequency-dependent response spectrum.
Because the present understanding of the seismicity within the Central Un.ted States (CUS) region does not permit the t
discrimination of all active tectonic features, both with respect to past and future activity, the " tectonic province or structure" approach, as defined by the USNRC in Appendix A, 10 CFR, Part 100, is the current method for determining the maximum ground motion potential at a CUS site.
Fcr most applications, the tectonic province approach can be overly conservative inasmuch as it assigns to every location a minimum seismic potential equal to the maximum historical earthquake.
Equivalently stated, the approach assumes that active faults with dimensions sufficient to support the maximum historical event are ubiquitous througrout the region.
This assumption contradicts the reulity of the earthquake process which involves failures of crustal rocks along zones of weakness.
The presence of weaker zones necessarily implies the Weston Geophysical
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_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ E coexistence of zones of strength, which indeed are observed as aseismic stable blocks.
The clustering distributions of earthquakes ir. the CUS, as well as in other regions, support this contention.
Although the source of seismic potential for a CUS site cannot be more specifically defined than with those estimates made by application of the tectonic province methodology, the expected vibratory motion, can be more realistically addressed with a site-specific approach than with the established practice of using generalized response spectrum shapes.
The site-specific approach develops response spectra based on strong motion data selected under criteria that closely model the parameters used to describe the occurrence of the maximum earthquake potential, as well as the plant site characteristics.
Of the various parameters available to quantify the sizes and effects of earthquakes at a specific site, those determined instrumentally are more reliable than any others based on noninstrumental evaluations.
For instance, the magnitude and location of an earthquake are computed from instrumental recordings.
Similatly, the strong ground motions observed at specific sites are recorded on accelerographs, and the local geologic conditions at the sites can be well determined using geophysical surveys.
On the other hand, the Modified Mercalli intensity at an accelerograph site is not easily evaluated and generally is assigned the intensity level prevalent in the surrounding region.
I Weston GeophysiCol
E E By using accelerograms selected according to three
- criteria, e.g.,
the magnitude of the earthquake, the distance to the recording station, and the local geology of the recording station, a range of expected ground motions at a site can be reasonably well established.
It should be noted that many more parameters influence the resulting site ground motion.
These include the fault mechanism, azimuthal directivity of the seismic wave radiation pattern, stress drop, etc.
Therefore, ground motion estimates determined on the basis of only three parameters will exhibit significant E
scatter, which can be interpreted as a probability density function of expected motions.
Consequently, the specification of the design ground motion at the site will involve choosing from the density function a probability level that adequately accommodates the uncertainty of the methodology.
2.0 THE SITE-DEPENDENT RESPONSE SPECTRA METHODOLOGY The approach used to develop site-dependent response spectra for the Midland site is based on the evaluation of the seismic ground motion potential at the site, within the context of tectonic provinces and structures (10 CFR, Part 100, 5
Appendix A), in terms of magnitude and location (distance to the site) of the maximum earthqua'Ke.
Real time histories (accelerograms) are then selected such that their magnitudes and epicentral distances approximate the estimate of the maximum earthquake and that the local geology at their E
E
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-4 B
l recording sations are similar to those at Midland.
Response
spectra are generated for each of these accelerograms and statistical processing of all the individual spectra yield average spectra that typify the maximum earthquake potential.
I Therefore, neither normalization nor scaling of the spectra to peak acceleration or peak velocity are required.
3.0 EVALUATION OF GROUND MOTION POTENTIAL AT THE MIDLAND SITE 3.1 Seismicity This section discusses the seismologic input to the development of the site spec,ific response spectrum at the Midland Nuclear Power Plant.
Specifically, the maximum earthquake potential at the site is determined in terms of magnitude in order to search available strong-motion data for records that are used in the derivation of the spectra.
The site, as outlined in the Midland FSAR, lies in the Michigan Basin.
It is part of the central stable region of North America and has undergone only mild deformation since the Paleozoic Era.
The low seismicity of the region, shown in Figure 1 manifests its stability.
As shown in this figure, the largest earthquake intensity that occurred within 200 miles of the Midland Site is VI (MM) and the largest earthquake magnitude is 4.5.
Figure 1 shows that l.
4 ear thquakes o f 1937 (205 miles from Midland site),
E We"on Geophv9 col
-. estimated m f 5.0 (Nuttli and Brill, 1980); and the b
1909 Northern Illinois Intensity VII earthquake, 250 miles from Midland.
A more detailed presentation of the regional seismicity is presented in the Midland FSAR.
The nearest areas with major seismic activity to the Midland site is in western Quebec.
Earthquakes in the magnitude range 2 to 4 are frequent in this region; three larger earthquakes with magnitudes in the range of 5.5 to 6.0 have also occurred.
This region is approximately 300 miles from the Midland site at its closest approach.
The area with largest earthquake activity in the entire region is centered around New Madrid, Mo., about 550 miles from the site.
The lower level seismic activity associated with the New Madrid area is more than 350 miles l
from Midland.
l Based on this overview of the seismicity near Midland, the selection of a magnitude 5.3m earthquake adjacent to b
the site represents a highly conservative assessment of the maximum earthquake potential.
The nearest area with l
historical activity even approaching this magnitude is approximately 205 miles from the Midland site.
3.2 Midland Site Characteristics 1
The original ground surface at the Midland site is underlain by approximately 360 feet of glacial deposits l
which overlie the site area bedrock formation, the Saginaw 1
5 1
5 we,em c e.,<e
l 11 I Shale.
Figure 2 shows both the geologic and material' description of the soils column beneath the site as typified by deep borings (Midland FSAR, Appendix 2A).
The compressional "P"
and shear "S" wave velocities shown on Figure 2, were determined by seismic measurements as discussed in Appendix 2C, Midland FSAR.
As stated in this appendix, "The seismic survey shows good correlation between the measured seismic velocities and the different soils and rock materials encountered at the site."
3.3 Selection of Accelerograms All currently available strong-motion records with epicentral distances less than 40 km and M magnitude g
ranging from 4.5 to 6.0 are presented in the histogram shown in Figure 3.
The magnitude data were obtained from Krinitzsky and Chang (1975), Nuttli (1979), ISC Balletins or other references.
Each record is represented by the reference number used by the agency that digitized the records (Cal. Tech. or Italian Agencies); or by a Weston Geophysical Corporation (WGC) reference number.
The station name and location of these records are presented in Table 1.
The histogram in Figure 3 shows a non-uniformity of the distribution of the records in terms of Mg magnitude; with few records from earthquakes with magnitudes 4.8, 5.1, 5.7 and 5.8.
Weston Geophysicci
L The histogram presented on Figure 3 was developed independent of site geologic criterion; that is, accelerograms recorded on deep alluvium as well as hard rock are included.
Thus, many of these stations would not be used to develop the site specific spectrum at Mi61and.
The local geologic characteristics of the recording stations have been the object of additional research.
The amount of information available on the foundation conditions of each station is highly variable.
It ranges from very general descriptions to detailed information including test borings and seismic surveys which provide data on layer thicknesses, and compressional and shear wave velocities.
For cases where details of recording site foundation conditions are not directly available, site foundation conditions have been estimated from available geologic maps, and where applicable, from geotechnical and geophysical data extrapolated from adjacent sites.
The geologic characteristics of each accelerograph station within this data set was rated in terms of their similarity to those at Midland and the inappropriate records are color coded on the histogram (Figure 3).
The remaining appropriate records, those records that were recorded at sites most similar to Midland are presented in Figure 4 and a detailed description of the geologic characteristics at each of these stations and the appropriate references are presented in Appendix A.
Weston Geophysical
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The two principal site characteristics that were evaluated for each recording station in the selection process are:
1.
the thickness of the crustal layers beneath the station; 2.
the shear wave velocity contrast between the layers.
As examples of the selection process, the measured shear wave velocity column for Gavilan College and velocities at the Cedar Springs Dam Pemphouse as estimated from a detailed boring log are compared with the velocities at the Midland site in Figure 5.
This figure shows that the thickness of the low velocity material is similar at all three locations.
Although an exact match in terms of velocity contrast could not be obtained, these stations fit the Midland site characteristics quite well.
As an additional example of the selection process, the shear wave velocities as estimated from compressional wave velocity measurements at the Maiano recording station in Italy show an appropriate velocity contrast, although the depth to the higher velocity layer is slightly greater when compared to Midland (see Figure 6).
The measured shear wave velocity column at Petrolia General Store shows a reasonably good match with overall velocity column for the Midland site although the velocity increase is gradual in i
Weston GeophystCol
ll I the depth range of 40 to 80 feet as compared to abrupt velocity increase at the Midland site (see Figure 6).
The El Centro, Hollister, and Oroville Station 7 are examples of stations which were not included in the Midland strong motion data set.
Shear wave velocities were measured at El Centro and Hollister by Shannon and Wilson and Agbabian Associates (SW-AA) and by the California Division of Mines and Geology (CDMG ) at Oroville Station 7.
Figure 7 compares the shear wave velocities at these stations with the Midland site.
At the El Centro station, the shear wave velocity column shows only a very slow and gradual increase with depth.
Although the Hollister station has higher velocities than the El Centro station, it shows only a small velocity contrast at the appropriate depth levels in comparison to Midland.
It was I
not included in the Midland data set because more appropriate stations are available (see Appendix A).
The measured shear wave velocities at Oroville Station 7 indicate a dense rigid material at ground surface which is not characteristic of the Midland site.
The depth to bedrock with shear wave velocity values of 4500 - 5500 f t/sec as measured at other nearb'f strong motion recording sites is unknown.
The shear wave velocity column for each of the selected stations is compared to the Midlcnd site on Weston Giophysical 1
1
E Figure 8.
Also shown on Figure 8 is the average velocity profile of all the selected stations for use in development of the Midland site dependent response spectra.
This average profile is just that; an average profile, and does not adequately describe the velocity contrasts or the depths at which velocity changes occur on individual l
profiles.
The average profile provides a quick check that the selected stations encompass the desired site conditions.
4.0 DERIVATION OF RESPONSE SPECTRA 4.1 Description o,f Selected Data Set Various descriptive parameters such as the earthquake date, magnitude, epicentral and hypocentral distance of the individual records shown in Figure 4 are listed in Table 2 along witn their ranges, mean values and standard deviations.
The range of magnitudes of the earthquakes, 4.9 to 5.5, represents a factor of almost 10 in total seismic energy released.
That is, a magnitude 5.5 contains about 10 times the energy of a 4.9 magnitude earthquake.
This narrow magnitude range is preferred over the next alternative, which is to widen the range and include a record with magnitude 5.9.
The range of total seismic energy released of this alternative data set is a factor of 40 and considered too large.
As shown in Table 2, the mean magnitude of the data set is 5.35 g (lecal magnitude), while the earthquake E
E g
E E potential, as discusced in Section 3.1, is a 5.3 m (body b
wave magnitude).
Using the Chung and Bernreuter (1980) formula that converts an Eastern U.S. measured m to an b
5 M
the 5.3 m is equivalent to a 5.45 M The mean g,
b g.
magnitude 5.35 M developed for this study is within the g
expected scatter of the actual magnitude estimates for a desired 5.45 M data set.
g The depths of the earthquakes presented in Table 2 indicate that each earthquake occurred within the earth's crust.
Deeper earthquakes are not expected for an intraplate regime such as the Central U.S.
The c:picent.ral distances range f rom 7 to 33 km with a mean of 17.6 km.
There are a total of 10 earthquakes that generated these records; 5 occurred in California and the other 5 are part of the Friuli Af tershock sequence.
Of the 44 total horizontal components used, 20 were recorded in California and the other 24 in northern Italy.
There is normally a significant amount of scatter in the peak acelerations for a particular magnitude.
Table 3 compares the averaged peak acceleration of the data set developed in this study with three empirical studies (Donovan, 1973, Esteva and Villarde, 1974 and McGuire, 1974), at the same mean magnitude and distance.
This table shows that mean of the three empirical peak accelerations are nearly the same as the mean of the Midland data set.
E E
Weston Geophyycol
I II I The smaller scatter of the Midland data set as implied by the lower value of the 84th percentile (see Table 3), is a tesult of the selection of records based on the geologic I
characteristics of the recording station.
4.2 Data Processing The general outline of the methodology used to compute response spectra is described in the flow chart (Figure 9).
As discussed previously, all recordings within the data base were not obtained from the same source.
Therefore, the degree of processing performed on the chosen records is not uniform.
The following sectiona discuss the general techniques used to generate response spectra.
4.2.1 Strong-Motion Signal Correction The data obtained f rom CIT and f rom EDS/NOAA were already corrected for the instrument response, digitization errors, and baseline drift and were ready for the spectra-generation process.
However, the Friuli accelerograms were obtained in an uncorrected
- form, i.e., only digitized and corrected for instrument sensitivity, scaled to g/10.
The general procedure and the computer program (EQCOR) used to correct these data are described in detail by Trifunac (1970) and Trifunac and Lee (1973).
Since publication of these reports, several advances have been made in the correction process; weston Geophysical
- j specifically, in the choices of the low-pass filter l
I values (Basili and Brady, 1978).
These l
1 j
state-of-the-art techniques were used to process the l
I uncorrected accelerograms.
4.2.2 Sp'ctra Derivation Response spectra are plots of the maximum response of a simple oscillator (une-degree of l
I freedom) to ground acceleration as a function of the natural period and damping of the oscillator.
The spectra are computed by solving the equation of motion l
i i
for the oscillator:
2 f
x+2 Sw x.
+
w x = -a l
where:
x is the relative displacement of the i
simple oscillator; a
is base (ground) acceleration at time t; t
l w
is the natural frequency of the oscillator; P
is the fraction of critical damping.
The details of the derivation of the solution to l
this equation and the computational procedures i
involved are discussed by Nigam and Jennings (1968).
4.3 Results
Seismic Response Spectra The response spectra of the forty-four horizontal
{
comper.ents listed in Table 2 were computed for several i
r i
values of critical damping.
Spectra at 5% of critical j
damping are shown over-plotted in Figure 10.
The large 1
Weston Geophysical 1
_ _ _ _ _ _ _ scatter, more than an order of magnitude, in spectral accelerations, velocity, and displacement, observed in i
Figure 10, clearly demonstrates the probabilistic nature of l
earthquake motions.
The observed scatter is a result of a variety of specific parametet s of the earthquake sources and transmission media.
The addition of more records based on the three criteria (magnitude, distance and site characteristics) would not necessarily reduce the scatter I
attributed to the specific sources and transmission paths.
The log normal median, mean and 84th percentile response spectra for five percent critical damping for the original ground surface are shown in Figure 11.
It should be noted that not all 44 components were averaged at all periods.
Within the period range of.04 to.P seconds (25 to 1.1 Hz), the 44 components averaged define the level and shape of the spectrum in the frequency range of interest for the Midland plant.
The nnmber of spectra averaged decreases with increasing period (above.9 seconds) since each accelerogram has its own pass-band selected during the correction process (see Section 4.2.1).
Table 4 shows the actual number of spectra averaged in various period ranges.
The development of the response spectra shown in Figure 11 incorporates conservatisms involved in the estimate of the earthquake potential and the suitability of Weston Geophysical
_ _ _ - - _ _. the data set to this estimate.
It also constitutes a conservative representation of the ground motion realistically tied to the specific Midland foundation characteristics, 1
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REFERENCES
- Basili, M.
and A. G.
Brady, 1978, " Low Frequency Filtering and the Selction of Limits for Acceleroarams Corrections",
I Sixth European Conference on Earthquake Engineering, Dubrovnik, Yugoslavia, September, 1978.
- Chang, F.
K.,
1978, " State-of-the-Art for Assessing Earthquake Hazaros in the United States, Report 9 - Catalogue of Strong Motion Earthquake Hazards, Volume 1, Western United I
9tates, 1933-1971", United States Army Engineer Waterways Enperiment Station.
- Chung, D.
H.
and D.
L.
Pernreuter, 1380, " Regional I
Relationships Among Earthquake Magnitude Scales",
Lawrence Livermore Laboratory Report 52745, prepared for United States Nuclear Regulatory Commission, NUREG/CR-1457.
CNEN-ENEL, 1978, Strong Motion Earthquake Accelerograms Digitized and Plotted Data.
Uncorrected Accelerograms, Volume 1, Parts 1-4.
- Donovan, N.C.,
1973, " Earthquake Hazards for Buildings, Building Practices for Disaster Mitigation:
Natl. Bur.
I Standards Building Sci., Series 4 6, pp.82-111.
- Esteva, L.
hnd R. Villaverde, 1974, " Seismic Risk Design I
Spectra and Structural Reliability", Proceedings:
5th World Conference on Earthquake Engineering, Rome 1973, Vol.
2, pp. 2586-2596.
International Seismological Centre Bulletins, Berkshire, United Kingdom.
Krinitzsky, E.
L.,
and F.
K. Chung, 1975, " State-of-the-Art for Assessing Earthquake Hazards in the United States, Report 4 - Earthquake Intensity and the Selection of Ground I
Motions for Seisuic Design", United State Army Engineer Waterways Experiment Station.
McGu ir e,
R.
K.,
1974, " Seismic Structural Risk Analysis, I
Incorporating Peak Response Regressions on Earthquake Magnitude and Distance", Massachusetts Institute of Technology, Department of Civil Engineering, Research Repo r t R7 4 -51.
Midland Plant Units 3 and 2 Final Safety Analysis Report, Docket No. 50-329 and 50-230, Consumers Power Company.
i weston Gecphysical 1
- Muzzi, F.
and S. Vallini, 1977, "The Friuli 1976 Earthquake Concidered as a 'Near Source Earthquake' Presentation and Discussion of the Surf ace Recordings, Proceedings of Specialist peeting on the 1976 Fruili Earthquake and the Antiseismic Design of Nuclear Installations, Vol. II, Rome, Italy, 11-13 Oct., pp. 46D-526.
- Nigam, N. C.
and P.
C. Jennings, 1968, " Digital Calculation of Response Spectra from Strong-Motion Earthquake Records", Earthquake Engineering Research Laboratory, California.
- Nuttli, O. W.,
1979, " State-of-the-Art for Assessing Earthquake Hazards in the United States, Report 16-The B
Relation of Sustained Maximum Ground Acceleration and Velocity to Earthquake Intensity and Magnitude", United States Army Engineer Waterways Experiment Station Miscellanicus Paper S-7 3-1, Report 16.
- Nuttli, O.
W.
and K. G.
Br ill, J r. 1980, " Earthquake Source Zones in the Central United States Determined from Historical Seismicity", prepared for the Nuclear Regulatory Commission (preprint).
Trifunac, M.
D.
1970, " Low Frequency Digitization Errors and a New Method for Zero Base-Line Correction of Strong-Motion Accelerograms", Earthquake Engineering Fesearch Laboratory, EERL 70-07, California Institute of Technology, Pasedena, California.
Trifunac, M.
D.
and V.
W.
Lee, 1973, " Routine Computer E
Processing of Strong Motion Accelerograms", Earthquake Engineering Research Laboratory, EERL 73-03, California Institute of Technology, Pasadena, California.
U SAEC, 1973, " Design Response Spectra for Seismic Design of Nuclear Power Plant", Regulatory Guide 1.60, Revision 1 USNRC, 1973, Appendix A-Siting and Geologic Siting Criteria for Nuclear Power Plants, CFR, Part 100, Section 10, Rules and Regulations, Federal Register, Vol. 38, No. 218.
Weston Geophysical Engineers, 1968, " Seismic Measuronents end overburden Amplification Curves", prepared for Consumers Power Company.
World Data Center A, 1979, Personal Communication; Updated table from L. Moris, S. Smockler and D.
Glover, 1977,
" Catalog of Seismograms and Strong-Motion Records, World Data Center A for Solid Earth Geophysics, NOAA, Report SE-6.
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TABLES B
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B B
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I TABLE 1 STATION NAMES AND LOCATIONS FOR RECORD REFERENCE NUMBERS II RECORD STATION NAME LOCATION REFERENCE NUMBER I028 Tolmezzo (lg)
Northern Italy I047 Tolmezzo (lg)
Northern Italy 1078 Forgario-Cornino Northern Italy 1079 Maiano E.
Northern Italy 1080 Maiano E.
Top Floor Northern Italy 1234 CDMG-1 Oroville, Calif.
4234 CDMG-4 Oroville, Calif.
5234 CDMG-5 Oroville, Calif.
8234 CDMG-8 Oroville, Calif.
J234 D. Johncon Ranch Oroville, Calif.
M234 Oroville Medical Center Oroville, Calif.
0234 Oroville Airport Oroville, Calif.
W234 Dept. Water Resources Oroville, Calif.
BV972 Bear Valley Fire Station Hollister, Calif.
MR97 2 Melendy Ranch Hollister, Calif.
SC972 Stone Canyon Geophysical Obs.
Hollister, Calif.
V329 U.S. Naval Station Port Hueneme, Calif.
I055 Forgaria-Cornino Northern Italy 1056 Maiano C.
Northern Italy 1350 CDMG-1 Oroville, Calif.
E l
TABLE 1 (cont.)
STATION NAMES AND LOCATIONS FOR RECORD REFERCNCE NUMBERS l
B RECORD STATION NAME LOCATION REFERENCE l
NUMBER 1
2350 CDMG-2 Oroville, Calif.
E 3350 CDMG-3 Oroville, Calif.
l 4350 CDMG-4 Oroville, Calif.
l 5350 CDMG-5 Orovil'Le, Calif.
J350 D. Johnson Ranch Oroville, Calif.
M350 Oroville Medical Center Oroville, Calif.
0350 Oroville Airport Oroville, Calif.
W350 Dept. Water Resources Oroville, Calif.
E350 Earl Broadbeck St.
Oroville, Calif.
Il86 Somplago Northern Italy 1040 Tolmezzo Northern Italy I
i 1700 CDMG-1 Oroville, Calif.
4700 CDMG-4 Oroville, Calif.
5700 CDMG-5 Oroville, Calif.
6700 CDMG-6 Oroville, Calif.
7700 C DMG -7 Oroville, Calif.
J700 D. Johnson Ranch Oroville, Calif.
E700 Earl Broadbeck St.
Oroville, Calif.
0700 Oroville Airport Oroville, Calif.
W700 Dept. Water Resources Oroville, Calif.
U297 Federal Building Helena, Montana E
E Weston GeophysiCc'
TABLE 1 (cont.)
STA. TION NAMES AND LOCATIONS FOR RECORD REFERENCE NUMBERS I
RECORD STATION NAME LOCATION REFERENCE l
NUMBER I
U307 Hollister Public Library Hollister, Calif.
'J 3 3 0 Federal Building Eureka, Calif.
I Il57 Forgaria-Cornino Northern Italy 1159 Somplago Northern Italy 1022 CDMG-1 Oroville, Calif.
0022 Oroville Airport Oroville, Calif.
U313 Hollister Public Library Hollister, Calif.
j 1059 CDMG-1 Oroville, Calif.
I M059 Oroville Medical Center Oroville, Calif.
0059 Oroville Airport Oroville, Calif.
GN74 Gavilan College Gilroy, Calif.
HN74 Hollister Public Library Hollister, Calif.
SJN74 San Juan Bautista San Juan Bautista, I
Calif.
PG175 Petrolia General Store Petrolia, Calif.
PC175 Cape Mendocino Petrolia, Calif.
FC675 Ferndale City Hall Ferndale, Calif.
PC675 Cape Mendocino Petrolia, Calif.
PG675 General Store Petrolia, Calif.
U301 Hollister Public Library Hollister, Calif.
U305 Hollister Public Library Hollister, Calif.
Weston Geophysical l
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TABM 1 (cont.)
I STATION NAMES AND LOCATIONS FOR RECORD REFERENCE NUMBERS l
I RECORD STATION NAME LOCATION REFERENCE NUMBER A013 Southern Pacific Bldg.
San Francisco, Cal:.t.
A014 Alexander Bldg.
52.n Frar.ri nco,
Calif.
A015 Golden Gate Park San Francisco, Calif.
A016 State Bldg.
San Francisco, Calif.
A017 Oakland City Hall Oakland, Calif.
1059 Forgaria-Cornino Northern Italy 1060 Maiano C.
Northern Italy 1061 Tarcento Northern Italy IO63 Tolmezzo (lg)
Northern Italy 1064 Tolmezzo (1/4g)
Northern Italy B022 Hollywook Storage Penhouse Hollywood, Calif.
B023 Hollywood Storage Basement Hollywood, Calif.
V316 Public Utilities Long Beach, Calif.
V317 Los Angeles Chamber of Commerce Los Angeles, Calif.
T292 Imperial Valley Irrigation District El Centro, Calif.
W334 6074 Park Dr.
Wrightwood, Calif.
W335 Allen Ranch Cedar Springs, Calif.
W336 Cedar Springs Dam Pump House Cedar Springs, Calif.
I Weston Geophysical E _ - _. _ _ _ _ _ _ _ _
E TABLE 1 (cont.)
STATION NAMES AND LOCATIONS FOR RECORD REFERENCE NUMBERS RECORD STATION NAME LOCATION REFERENCE NUMBER W338 Hall of Records San Bernardino, Calif.
E, W339 Southern California Edison Co.
Colton, Calif.
B030 Ferndale City Hall Ferndale, Calif.
I T288 Imperial Valley Irrigation District El Centro, Calif.
A010 Bank of America San Jose, Calif.
1051 Forgaria-Cornino Northern Italy IOS2 Maiano C.
Northern Italy IO54 Tolmezzo Northern Italy l
1131 Forgaria-Cornino Northern Italy Il32 San Rocco Northern Italy Il33 Tarcento Northern Italy l
1134 Somplago Northern Italy U309 Hollister Public Library Hollister, Calif.
A018 Hollister City Hall Hollister, Calif.
E l
T287 Imperial Valley Irrigation i
District El Centro, Calif.
B033 Cholame, Shandon Array No. 2 Parkfield, Calif.
B034 Cholame, Shandon Array No. 5 Parkfield, Calif.
l B035 Cholame, Shandon Array No. 8 Parkfield, Calif.
B036 Cholame, Shandon Array No. 12 Parkfield, Calif.
I B037 Temblor No. 2 Parkfield, Calif.
E
\\
l. -
I l
TABLE 1 (cont.)
l STATION NAMES AND LOCATIOt2S FOR RECORD REFERENCE NUMBERS l
l RECORD STATION NAME LOCATION REFERENCE NUMBER OS875 Oroville Seismograph Station Oroville, Calif.
OD875 Oroville Dam Oroville, Calif.
U312 Ferndale City Hall Ferndale, Calif.
U299 Santa Barbara Courthouse Santa Barbara, Calif.
1138 Forgaria-Cornino Northern Italy 1139 San Rocco Northern Italy i
I142 Samplago Northern Italy Il43 Buia Northern Italy B025 Carroll College Helena, Montana U295 Federal Building Helena, Montana Il68 Forgaria-Cornino Northern Italy Il69 San Rocco Northern Italy I 17 2 Tarcento Northern Italy Il77 Buia
!;orthern Italy i
I i
1 l
W W
W W
W W
W1 n'O Fl FW TABLE 2 SELECTED ACCELEROGRAMS FOR MIDLAND NUCLEAR POWER PLANT (ORIGIN!'_ CROUND SURFACE)
Re f.
Epic.
Hypo.
Peak Date Ti me( UT) mb ML De pth Io Location No.
Dist.
Dist.
Acc.
Comp.
Station (km)
(MM)
(km)
(km)
(gals)
MAR 22 19 57 19:44:21 5.1 5.3 11 VII San Francisco, CA A013 16.8 20.1 45.9 N4 50S S. Pacific Bldg.
44.9 N4 50W San Francisco, CA HAR 22 19 57 19:44:21 5.1 5.3 11 VII San Franc isco, CA A014 15.2 18.8 41.8 N090W Alexander Bldg.
45.4 N810E San Francisco, CA HAR 22 1957 19:44:21 5.1 5.3 11 VII San Francisco, CA A015 11.8 16.1 81.8 N100E Golden Gate Park 102.8 S8 00E San Francisco SEP 12 1970 14:30:52 5.2 5.4 9
VII Lytle Creek, CA W336 23.8 25.4 55.9 S540E Cedar Springs Dam 69.4 S360W Pump House SEP 12 1970 14:30:52 5.2 5.4 9
VII Lytte Creek, CA W338 22.9 24.6 113.0 NS San Bernardino 57.5 EW Hall of Records SEP 12 1970 14:30:52 5.2 5.4 9
VII Lytle Creek, CA W339 31.5 32.8 40.2 NS SCE Co., Colton 35.3 EW SEP 12 1970 14:30:52 5.2 5.4 9
VII Lytle Creek, CA W334 13.9 16.1 139.0 S650E Wrigh t wood 194.0 S250W NOV 28 19 74 23:01:25 5.0 5.2 9
VI Gilroy, CA GN74 9.
12.7 134.7 S670W Gavilan College 94.1 S230E JAN 12 19 75 01:37:17 4.7 5.2 2.0 VI Cape Mendocino, CA PC175 11 11.2 179.7 N750E Petrolia 113.7 N150W General St ore JUN 07 1975 48:46:22 5.4 5.2 21 VIII Cape Mendocino, CA PG6 75 30.5 37.0 158.5 N750E Petrolia 128.1 N150E General Store
- q MAY 07 1976 00:23:45 4.8 49 30.0 VI Friuli, Italy 040 32.2 44.7 121.1 NS Tolmezzo 3
71.2 EW O
o HAY 09 1976 00:53:45 5.0 5.5 1.0 IX Friuli, Italy 0 51 23.2 25.2 38.6 NS Forgaria-Cornino 35.6 EW
{[562
TABLE 2 SELECTED ACCELEROGRAMS FOR MIDLAND NUCLEAR POWER PLANT (ORIGINAL GROUND SUF FACE) (cont. )
Re f.
Epic.
Hypo.
Peak Date Time (UT) mb ML Depth I
Location No.
Dist.
Dist.
Acc.
Comp.
Station o
(km)
(MM)
(km)
(km)
(gals)
MAY 09 1976 00:53:45 5.0 5.5 1.0 IX
- iuli, Italy 052 24.8 24.8 73.3 NS Maiano 39.9 EW MAY 09 1976 00:53:45 5.0 5.5 1.0 U.
Friuli, Italy 054 22.0 22.0 33.2 NS Tolmezzo 32.2 EW MAY 11 1976 22:44:00 4.9 5.3 19 VIII Friuli, Italy 059 9.7 21.3 296.8 NS Forgaria-Cornino 178.7 EW MAY 11 1976 22:44:00 4.9 5.3 19 VIII Friuli, Italy 060 11.8 22.4 66.3 NS Maiano 45.3 EW MY 11 1976 22:44:00 4.9 5.3 19 VIII Friuli, Italy 061 11.7 22.3 31.0 NS Ta rce nt o 61.0 EW MAY 11 1976 22:44:00 4.9 5.3 19 VIII Friuli, Italy 063 13.4 23.3 37.8 NS Tolmezzo-1 28.2 EW
' AY 11 1976 22:44:00 4.9 5.3 19 VIII Friuli, Italy 064 13.4 23.3 25.5 NS Tolmezzo-2 21.2 EW l
SEP 11 1976 16:31:12 5.0 5.5 9
VIII-Friuli, Italy 131 15.8 18.2 93.0 NS Forgaria-Cornino I
IX 102.1 EW l
SEP 11 1976 16:31:12 5.0 5.5 9
VIII-Friuli, Italy 133 7.5 11.7 158.0 NS Ta rcent o IX 79.1 EW SEP 15 1976 04:38:53 4.8 5.0 21.5 VII Friuli, Italy 157 13.6 25.4 54.4 NS Forgaria-Cornino i
49.6 EW I
.9-5.5 2-22 7-33 11-37 21-194 MEAN 5.0 3
12.2 17.6 22.7 82.8*
k STANDARD DEVI ATION
.16
'. 5 7.7 7.7 7.8 127.8**
"~
- Lognormal Mean a
- 84th percentile of lognormal d,tribution (Do OUk m
R
ll TABLE 3 PEhK ACCELERATION FOR MIDLAND DATA SET AND THREE EMPIRICAL STUDIES Donovan Eseteva & Villaverde McGuire Midland I
(1973)
(1974)
(1974)
Data Set Mean Peak I
Acceleration (cm/sec2) 82.8 102.1 97.2 82.8*
B 84th Percentile 190.4 194.0 162.3 127.8**
Lognormal lean Lognormal 84th Percentile I
I I
I I
I Weston Geophysical
TABLE 4 NUMBER OF RESPONSE SPECTRA ORDINATES AVERAGED IN VARIOUS PERIOD RANGES Period Number of Response (sec)
Spectra Ordinates I
.04.90 44
.91-1.0 42 1.2 34 1.6 28 2.0 22 2.4-7.2 14 5
B B
B B
B 5
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1, I
L SEISMICITY OF NORTHEASTERN AND NORTH CENTPAL UNITED STATES AND ADJACENT CANADA FIGURE 1
1 SEISMIC WAVE VELOCITY ORIGIN AL GROUND SURFACE 1 P
S ELEV 600' 0 N BEACH AND DUNE DEPOSITS -
l B
MODERATELY DENSE 5200 850 TO DENSE SAND 1
c -GLACIAL TILL-HARD COHESIVE CLAY WITH SAND, 2300 GRAVEL AND 500'-
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VERY C2NSE FINE SAND WITH SOME SILT 300' -
SHALE -SAGINAW FORMATION 10,000 5000
._ t SITE CHARACTERISTICS MIDLAND NUCLEAR POWER PLANT SITE FIGURE 2 Weston Geophysical
ME E
E E
E E
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I ALL AVAILABLE APPROPRIATE FOR ORIGIN AL GROUND SURFACE STRONG MOTION RECORDS
. TOO SOFT ML : 4.5 - 6.0 h TCO STIFF
~
NO GEOLOGIC CRITERION
[ INAPPROPRIATE LOCATION OF INSTRUMENT l
i STATION PROBLEMS i
STATION VERY NEAR SURFACE RUPTURE 26 -
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COMPARISON OF
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SHEAR WAVE VELOCITY COLUMNS l
j CEDAR SPRINGS DAM PUMP HOUSE AND i
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320-E N
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400 O
1000 2000 3000 4000 5000 600C FIGURE 5 g
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0 1000 2000 3000 4000 5000
/ GROUND SURFACE O
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40 COMPARISON OF E
i SHEAR WAVE VELOCITY COLUMNS b-I q
M AI ANO, ITALY AND PETROLIA GENERAL STORE 80~
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120 PETROLIA GENERAL STORE l
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1000 2000 3000 4000 5000 6000 FIGURE 6 Weston Geophysical
V IN FEET /SECOND f ORIGINAL 3
0 1000 2000 3000 4000 5000
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COMPARISON OF
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EL CENTRO, HOLLISTER, AND I
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1 i
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ALL SUITABLE ACCELEROGRAPH STATIONS N
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0-
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RANGE IN ESTIM ATED SHEAR
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1 400 O
1000 2000 3000 4000 5000 6000 F1G:;RE 8 Weston Geophysical
e a
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a e
a e
M e e e CW W CMT M
COMPUTE MEAN RESPONSE PLOT RESPONSE SPECTRA +
CORRECTED ACCELEROGRAM GENERATE RESPONSE SPECTRA
=
g AT DESIRED DAMPING RATIOS SPECTRA (PROGRAM SPECEQ)
U UNCORRECTED ACCELEROGRAM l
PLOT ACCELER0 GRAMS
=
CHOOSE FILTER PARAMETERS i
RUN PROGRAM EQCOR l
3 IS CORRECTION NO l
ADEQUATE?
5l U YES l
?
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OUTLINE OF DATA PROCESSING TECHNIQUES l
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OVERPLOT OF RESPONSE SPECTRA FOR THE ORIGINAL GROUND SURFACE AT THE MIDLAND NUCLEAR POWEP PLANT 5% CRITICALLY DAMPED FIGURE 10 Weston Geophysical
Q^.
8 Nr
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MEDIAN, MEAN AND 84TH PERCENTILE RESPONSE SPECTRA FOR THE ORIGINAL GROUND SURFACE AT MIDLAND NUCLEAR POWER PLANT FIGURE 11 Weston Geophysical
1 E
E APPENDIX A GEOLOGICAL AND GEOPHYSICAL DESCRIPTION E
STRONG MOTION PECORDING STATIONS B
B B
E B
B B
B E
WC5fon GCCphysical
I l
TABLE OF CONTENTS E
Page iE W
l.0 INTRODUCTION A-1 2.0 STATION DESCRIPTIONS A-2 E
2.1 Alexander Building and Southern Pacific Building, San Francisco A-2 l
2.2 Cedar Springs Dam Pump House A-3 2.3 Forgaria-Cornino A-4 l
l 2.4 Gavilan College A-5 2.5 Golden Gate Park A-6 2.6 Maiano A-7 2.7 Petrolia General Store A-8 2.8 San Bernardino Hall of Records A-9 2.9 Southern California Edison Substatinn, l
Colton A-10 E
2.10 Tarcento A-ll l
2.11 Tolmezzo A-12 2.12 Wrightwood A-13 l
FIGURES REFERENCES E
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LIST OF FIGURES Figure No.
Title A-1 Summary Log, Alexander Building, San Francisco, California A-2 Comparison of Shear Wave Velocity Columns, Southern Pacific Buidling and Alexrader Building, San Francisco vs. Midle.id A-3 Summary Log, Pump House Cedar Springs, California A-4 Comparison of Shear Wave Velocity Columns, Cedar Springs Dam Pump House vs. Midland A-5 Comparison of Shear Wave Velocity Columns, Forgaria-Cornino, Italy vs. Midland A-6 Summary Log, Physical Science Building E
Gavilan College, Gilroy, California A -7 Comparison of Shear Wave Velocity Columns, E
Gavilan College, Gilroy vs. Midland A-8 Summary Log, Golden Gate Park, San Francisco, California A-9 Geologic Summary of Strong-Motion Sites, San Francisco - Golden Gate Park A-10 Comparison of Shear Wave Velocity Columns, Golden Gate Park (A) and Golden Gate Park (B), San Francisco vs. Midland A 11 Soil Profile at Accelerograph Station Maiano A-12 Comparison of Shear Wave Velocity Columns, l
Maiano, Italy vs. Midland l
A-13 Summary Log, General Storc
- Petrolia, l
A-14 Compa-ison of Shear Wave Velocity Columns, Petrolia General Store vs. Midland j
A-15 Earthquake Site Characteristics Project, l
Station:
San Bernardino lE
l Figure No.
Title A-16 Comparison of Shear Wave Velocity Columns, San Bernardino Hall of Records vs. Midland A - 17 Earthquake Site Characteristics Projects, Station: Colton, Edison Substation A-18 Comparison of Shear Wave Velocity Columns, Southern California Edison Substation, Colton l
i vs. Midland A-19 Comparison of Shear Wave Velocity Columns, Tarcento, Italy vs. Midland A-20 Soil Profile at Accelerograph Station Tolmezzo A-21
- mparison of Shear Wave Velocity Columns, e
rolmezzo, Italy vs. Midland A-22 Summary Log, 6074 Park Drive, Wrightwood, California A-23 Comparison of Shear Wave Velocity Columns, Wrightwood vs. Midland I
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1.0 INTRODUCTION
This appendix discusses the subsurface geological and geophysical characteristics of the strong motion recording stations which were used in the development of site specific response spectrum for the Midland site.
The available data includes test borings, seismic surveys and lithologic descriptions collected at the specific site or at other nearby locations.
Many of these data were collected by Shannon &
Wilson and Agbabian Associates (SW-AA) under studies funded by the Nuclear Reg.tlatory Commission.
Each station description includes a comparitive plot of the measured or estimated shear wave velocities and layer thicknesses with those at the Midland site.
Where measured shear wave velocities are not available for a particular station, they have been estimated from measured compressional wave velocities or from an evaluation based on the descriptions of the subsurface materials and l
Weston's experience in other similar geologic environments.
The stations discussed in this Appendix were incorporated into the Midland data set, based on similarity in site characteristics, particularly velocity structure (layering) and velocity contrasts.
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2.0 STATION DESCRIPTIONS 2.1. Alexander Building and Southern Pacific Building, San l
Francisco The boring and shear wave velocities at the Alexander Building as published by SW-AA (1980), are shown in Figure I
A-1.
The. shear wave velocities are compared with those at the i
Midland site in Figure A-2.
Test borings drilled at the Alexander Building encountered cedimentary rock of the
)
Franciscan Series at a depth of 140 feet (SW-AA, 1980).
Seismic velocity measurements have been made at nearby localities and show a gradual increase of the velocity with depth.
Although the velocity increase at a depth of 35 to 50 feet is not as sharp as for Midland, this station has been included in the Midland data set because it is in good agreement for the top 50 feet.
The Southern Pacific building is also incorporated because of its proximity (approximately
.3 niles distant) to the Alexander Building.
No boring data are available for this station, although Idriss and Seed (1968) estimated a much deeper depth to bedrock, 285 feet for Southern Pacific vs. the boring depth of 140 feet (SW-AA, 1980) for the Alexander Building.
Nonetheless, the velocities of the top 50 feet at Southern Pacific Building bre judged similar to the Alexander Building and t'.ius the station is incorporated into the Midland l
data set.
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i 2.2 Cedar Springs Dam Pump House The log of the boring obtained adjacent to the accelerograph station (SW-AA, 1980) describes the Crowder i'
formation as a poorly indurated sandstone, conglomerate and fanglomerate (see Figure A-3).
The log indicates that the material became very dense at a depth of thirty-seven feet.
Shear wave velocities have been estimated based on the f
aescriptions of the materials and are compared with Midland velocity colunn, Figure A-4.
This site has been included in the Mid'and data set because the depth to the first major interfece layer, and the velocity contrasts are reasonably similar.
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E 2.3 Forgaria-Cornino The subsurf ace profile at this accelograph station in Italy was developed from test borings which encountered sedimentary rocks at a depth of 15 meters (Muzzi and Pugilese, 1977).
The overburden material consists of alluvial deposits with shear wave velocities estimated to range from 300 m/sec near the surface, increasing with depth to 400 m/sec at 10 meters and 1
500 m/sec at 15 meters (Muzzi and Pugilese, 1977).
The f
estimated shear wave "elocity for the sedimentary rock is based
}M on compressional wave velocities measured at other nearby ig
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locations.
Figure A-5 shows that the estimated shear wave i
i velocities and layer thickness at the Forgaria station are very i
similar to those at the Midland site.
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E 2.4 Gavilan College The log of the boring obtained adjacent to the Physical Sciences Building at Gavilan College describes 40 feet of clay E
i overlying sedimentary rocks of the Monterey and Franciscan Formations (see Figure A-6).
The measured shear wave velocities also show a significant increase at this depth producing a velocity contrast which is very similar to the Midland site (see Figure A-7 ).
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l 2.5 Golden Gate Park The geologic conditions at the strong motion accelerograph
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station at Golden Gate Park are described as flat-lying sedimentary rocks of the Franciscan Series which are weathered and fractured near the surf ace.
Two sets of shear wave velocity measurements exist for this site (see Figures A-8 and A-9).
The velocity measurements of Silverstein (1978)
(Figure A-9) are accepted as more representative of the j
sedimentary rocks at Golden Gate Park, although it is possible that either velocity value could exist at any particular location.
Figure A-10 shows both Golden Gate Park velocity profiles compared with the Midland velocity profile.
Although the
- 5 overall velocity values are comparable, Profile A shows a gradual increase in velocity in comparison with the sharp i
increase noted at the Midland site.
Profile B has much higher velocities that the Midland site, however, the velocity contrast and layering compare favorably.
The type of materials i
and the increasing shear wave velocity with depth are the basis for including the accelerograms from this station into the Midland data set.
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2.6 g iano The soil profile published by Muzzi and Vallini (1977),
presented in Figure A-ll shows that a competent material composed of stiff clays and gravels is encountered at a depth of 20 meters (66 f t. ).
The measur 1 compressional wave velocity of this layer is 3 km/sec.
The estimated shear wave velocities for the Maiano station are compared with those at Midland in Figure A-13.
This station has been included in the 1
- 4idland data set because of the similarities in layering and shear wave velocit'.es.
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2.7 Petrolia General Store l
The log of the boring obt.ined adjacent to the instrument I
!g amm shelter shows a change from sand to sof t sandstone (Yager Formation) a' a depth of 56 feet (see Figure A-13).
The increase in the measured shear velocity at this depth is gradual in contrast to the abrup> increase in shear velocity noted on the Midland profile (see Figure A-14).
At a depth of i
i 120 feet, the shear velocity increases to 3300 ft/sec, indicating an improved competence of the bedrock as noted on I
the boring log.
The layering at this site and the shear wave l
velocity column generally conform to the Midland site.
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l ll 2.8 San Bernardino Hall of Records The description of the geologic column at th site by Duke and Leeds (1962) indicates a moderately dense alluvial material at a depth of 58 feet and a dense, older allus_al material at a depth o f 150 feet (see Figure A-15).
The shear wave velocity as estimated by Duke and Leeds (1962) is also presented in Figur ? A-15.
The depths to the various layers in terms of shear wave velocity are similar to the Mit and site (see Figure A-16).
Although the shear wave velocities for this station as estimated by Duke and Leeds would appear to be somewhat high estimates for the material descriptions, the overall layering at the station and the shear wave velocities are the basis for including it in the Midland data set.
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E 2.9 Southern California Edison Substation, Colton gW The shear velocities published by Duke and Leeds, 1962, (Figure A-17), are based on compressional wave velocity data measured in the vicinity of the station with the assistance of California Department of Water ReEources.
The Colton station
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is included in the Midland data s(t on the basis of similar layer thicknesses and shear wave velocities to the Midland site 1
(see Figure A-18).
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2.10 Tarcento The geologic conditions at the Tarcento, Italy site are i
described as 10 meters of recent alluvial deposits overlying sedimentary rocks, namely, marl and sandr one (Basili, et al.,
2 1977).
The shear wave velocities for t.s.~e materials have been l
estimated from compressional wave velocities measured at other nearby locations.
The description of this station in terms of i
)
layering and estimated sheer wave velocity column (see Figure j
A-19) indicate that it is similar to the Midland site, and it 1
has therefore been included in the Midland data set.
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2.11 Tolmezzo The Tolmezzo, Italy strong motion accelerograph station as described by Basili, et al.,
(1977) is located on a fractured complex of Triassic sedimentary rocks, mainly limestones and dolomites.
This station has been included in the Midland data set because of the depth of approxima'.ely 20 meters to more competent rock (see Figure A-20) and the shear wave velocity column estimated from the measured compressional wave velocity values.
The layering and shear wave velocity columns compare favorably with the Midland site as shown on Figure A-21.
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2.12 Wrightwood
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The log of the boring obtained adjacent to the Wrightwood station notes a dense to very dense material near surface which i
becomes even harder at a depth of 40 to 50 feet (see Figure A-22).
The estimated shear wave velocity column based on the i
material description shows an increase in velocity at the same l
depth as the Midland site (see Figure A-23) and thus, the Wrightwood station is accepted in the Midland data set.
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REFERENCES - APPENDIX A E
Basili M.,
S. Polinari, and G. Tinelli, 1977, " Strong Motion Records of Friuli Earthquakes", Proceedings of Specialist Meeting on the 1976 Friuli Earthquake and the Antiseismic E
Design of Nuclear Installations, Vol. II, Rome, Italy, 11-13 Oct., 1977, pp. 375-386.
Duke, C.
M.,
and D. J.
Leeds, 1962, " Site Characteristics of Southern California Strong-Motion Earthquake Stations",
Departrent of Engineering, Report No. 62-55, University of California, Los Angeles.
- Idriss, I.
M.
and H.
B.
Seed, 1968, "An Analysis of Ground Motions During The 1957 San Francisco Earthquake",
5 Seismological Society of America Bulletin, Vol. 58, No. 6, pp. 2013-2032.
E Muzzi, F.
and S. Vallini, 1977, "The Friuli 1976 Earthquake Considered as a 'Near Source Earthquake' Presentation and Discussion of the Surface Recordings", Proceedings of Specialist Meeting on the 1976 Friuli Earthquake and the 5
Antiseismic Design of Nuclear Installations, Vol. II, Rome, Italy, 11-13 Oct., pp. 460-526.
Muzzi, F.
and A. Pugliese, 1977, Analysis of the Dynamic Response of Soil Deposit in Locality Ca' Dant (Cornino-Forgaria) Proceedings of Specialist Meeting on the 3
197 6 Earthquake and the Antiseismic Design of Nuclear Installations, Vol. II, Rome, Italy, 11-13 Oct., pp.
541-566.
Shannon and Wilson and Agbabian Associates, 1980, "Geotechnical Data from Accelerograph Stations Investigated During the Period 1975-1979, Summary Report", prepared for United E
States Nuclear Regulatory Commission, NUREG/CR-1643.
Silverstein, B.
L.,
1978, " Geologic Description of Selected 5
Strong-Motion Accelerograph Sites, Part 1",
United States Geological Survey Open-File Report No. 78-1005.
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a, s!
e
(
120 i
- E 16 0-i 5
j u 200 E
a
?
E a
o 240 i
i, 280-I
/ /
RANGE IN DEPTH TO HIGH VELOCITY
/ /
LAYER IN MIDL AND SITE AREA 320-E i
E 360 E
I i
1
{
400 0
1000 2000 3000 4000 5000 6000 FIGURE A-7 i
Weston Geophysical
LOG '
sHU9 eut vttacIn typ
( H i t "" 5tG*D I cr 7,t-tw t tscei rs ich u.
i o..
in.
m.
no.
E i
i 6
i i
se ei n e r e s, iii...i t,...ii.:
te a. o f i.4. w i. n.. o. m...
se ea
.; 5 Q"
4pp t ^t t r ett illen t one )
I l2
- S
- 4Je ta t tiv hard eed erg ttle lla t 6. fresh to slightly testbefed, s!_
g 3 *,.,
k.rd a9J t r a 't le (blST and tieselv fisc teres SMALI and Cutaf m
aI7 94L E E 5
$ bI le
{
$[
,,- o...m. ie 9 E
f Generellaed tends tion s ter site 36 E
h{
=
Pr e s e r poos Cross - LM5.1577 ene 19?S) o E
3C 1
1 10 U
C E
Ez so m
E I
40 E
I i
i i
i i.
E VE Lot tt i ts soere.
tr 8 P B (19 ? ? 6 1975)
I Pe r m a cc.B)
(*B Loca t ion s tite 19. P r o p o rtmon C ro-o l e ro, r e th station),
(sit e o f Golden Gate Dates match 31. 1976 E
B2 pC p?
SW-AA (19 7 7b)
SUI L.C I N G The acce le rogr aph l e housed in. esa t t basilding f ound ed at grado et t he t.ese of Prayerboom Crose.
.e t., i. i e i. 4.s e..a l
wns, n no, i., e..... 4.. t m.it..
i
.. t a. A.,....... rv. a a s i,....it.
,eco... i
..c.
l (SW-AA. 19 7 7t,}.
SUMMARY
LOG GOLDEN GATE PARK l
SAN FRANCISCO, CALIFORNIA E
.me s e e1.- s.
cc1.<...
1eee ec:= emcce
<<cm e1c.
-ee. sm mmcm m.11.mm e
FIGURE A-8 5
Weston Geophysical
GEOLOG1C SWNARY OF STRON3-M3:10N ST:ES pate4/78 Station So. 1117 Station SAN FRANCISCO - Golden Gate Park
- cpth P-Wave.
S Vave Censitu Lo; Site Geologu 1
. eters m/see g/c4
)l h Cz yh%
Franciscan chert t 2 T
!E 390 200 1 >
1 c
t,
l 1
)
- 5 583 316 mk 634 364 7 x I
_ r T5 E
l I
XJ
_ 10 760
' 308
[
l3 803 527 Franciscan shale 5
=
4 809 582
!E 2.31 i
'3 l
'1020 611
-1070 636
,_ 2 0
_r-1 m
[ P 3, Franciscan chert a
v y
1 E
,73 412m T K 3 E A N fl i
N3 5
-30 11/75 -
cottom of. core Franciscan chert and shele E
E E
E S
FIGURE A-9 USGS-Silve rs tein, ED CH+SH 1078 Reproduced from page 16, E
Weston Geophys: col
l l
l' l!,lll l
l ill>}i[,l il
,l'(
- !l l
l l>
.(
f _z'mm< m8ZO om5Enr 5 om0Eo x >nm O
o u8 ao8 w8o o
~
/
/
/
clllI'I J nOE'>mgoz D
/
ao I
x
' j!,
MIgx g>h <mrOON oorCI U i
N
\\
eoFomZ C>4m, >xf 3 >Zo
)
g B
OOromz OpHM T>2x m.sz '" Z mO
/
K
(
)
R A
A
$m E gm33 13I <mIo \\ r> mm Z gog5 eam >mm> moi I $o I f oo O O u8 3og oooO eooO 2ncxA _o S'o&a Oo >$50-I l l 11 i!5' is11 E I ~ ~ ~ 0-~a Io f o N x 5cI=6yo $%o=.'d3. Km/g.a.'LC--t2 -o_-T-oh~"l* cr- *~ *37* ~ E4s*l* c.-i E f S M 'd .e_- 0. s _- p *o -.e 5: E j. o c- . * -o.. - (% - O--o - - - p3
- O o
o o g, o o o o00 o o o o o o, o o o o,
- ,h o
o o 3 o o a o O o 0e O
- 0 0
o0, O0 oe o o o VD = 0,8 kmh.ac. o 0 o o I o. o E U o O o E o o
- a' e
o oo e o o O o o 'O o* y o. 0 00* o o oo i gr~ ave,lS o o oe o o o .0 o
- O 'o*'o O
, e C
- o*
- 0, o
o n,o o o* o o e o, ce
- o
- 0. 0*
o o Oo O.# 0 o*. 8* E O o* 0 0
- o o
o* o o O *o* _;t pk iMfi%$
- J
&w) M x// %w b a n %:n.1
- bk s
E Soll Profile at Accelerontaph Station Maiano Reproduced from F i r;. 6,
- uzzi and Vallini, 1977 E
5 FIGURE A-11 5 Weston Geophysical V ItJ FEET /SECOND r ORIGINAL 3 0 1000 2000 3000 4000 5000 / GROUND SURFACE 0 I i i i i i L___ l l COMPARISON OF 40-A / SHEAR WAVE VELOCITY COLUMNS M AI ANO, ITAL'r I V S. L_______.------ MIDLAND f I l l 80-I 1 I I I i 120 l l l I i 160-I l lg l l o o1 0 200 E $l E d El E 21 f -z l l z E $ 240 E 280-E / / RANGE IN DEPTH TO HIGH VELOCITY / / LAYER IN MIDL AND SITE AREA 32 0-360 E 400 0 1000 2000 3000 4000 5000 6000 FIGURE A-12 Weston Geophysicot l 041 ftST Ola SM4GT EM.U t e entra contrat. t 3 [ A stamonao ranrisafim assisin=(3, stres / rt. i E e to to Se e* Se se gstg ty, b. == l g 3 g 1 l l f' O Sua lad VELJ0ln (V l e t sc ca sc airfic. (sett fra secreo) 0861- '{ . b ud u e goe
- gee, ipe 3e,,
- gge,
,e,, B I 3. l l ersi.e s ti r r, ees tles g r ey. 3 l l et ees. eilly (Lav a 1 sei, se.se, se t s ies g r ey.orees. ~ t h eyeT. Silty. Ef eselly. Ilse I I L' II3 to tear se Sa%D e ~ e l>B) l' I 4,18 [riestle Liest 3 a s, D e, f.d.e.r e.e,. se n i, ..s e r roe i nem sefy g seedy, sitty ~ ct ei [ II I I' 3I I II ligelt Llelt ,5 0 / s' s e wi t 2 / D' j bety desse grey, slaattay 0 > SO / t* tietey, salty, gravelly, f ase s= se se to coarse SatD i go. w,5 g j 3 m /S/lG* $4 g Mets. Gera sf ee. sa 6 ty LLat. p highly f r at t e f ed end e lla t e s. E sedea (Sitistsht fety sof t) e U CL ~ teeensie s e d E m n.: ese-sa. Infee) 6 g I a ? E e e e u e a 5: Ct a soc 3* 10e-3' = -e i l 5 ~.
- 2 E:
130 m.- S I L 151041 Sof t. g r ay, algtty a. ~ rrefleted en th et t a s t ea a l 4 o s6s taeosides. Groses locally a e EI t o sof t. greF. f ase.gre ased (g 5 A%L570% E g O 5 Its 2 ISt-e l s e O I ( CL e f i. -_i __ li f I ,,,,3 1s0TTi e a n aru m at hm l Ct>wtt ET3 D e -t /1e E posihG flese t ten IOS ft. WSL ( a s te rpol a t e d f r ee L.03 tepe tee f. ). Le< s t see SS ft. at of the teatreerst ste a ter ens itw it.
- m. of the General Ster e,
cat s Searce so.a4 f inite t Egespeens reelles lSet pot sf y er:11 seaplaag esta se set stese estrel, see s ty t o ne s, e pitsker ser rel see .e . c. r e o e r, e,,,... e,. I yE1M 4Til3 see, e .e.aa,,,,.., te s t.ee. .see eie t e.t.o. ,e,,e t e r., e..e v e.... e '
SUMMARY
LOG rete.
,eee..
,,,e GENERAL STORE
.i ~et :
se..a.
.,,e'
.t i t, c T. e... e e r.....e, s
,0.. t e., e e
,,e e,, e l., e s t. e e t a t PETROLIA, CALIFORNIA
..e i t e,....e ee e e r. e
Reproduced from Fig.
A-62, Shannon & Wilson and Agbabian Associates, 1980 FIGURE A-13 Weston Geophysical
I V IN FEET /SECOND ORIGINAL 3
0 1000 2000 3000 4000 5000 GROUND SURFACE O
j i
i i
i i
( \\
\\
COMPARISON OF SHEAR WAVE VELOCITY COLUMNS
'[/
40-
/
PETROLIA GENERAL STORE s(
VS, g
i MIDLAND
\\
80-
\\
l I
i 120 I
w
$I Gl l
160-il l
9
~
5 8
i e
O C 200 2
A U
E I
$ 240 lW E90-
//
RANGE IN DEPTH TO HIGH VELOCITY j
/ /
LAYER IN MIDLAND SITE AREA l
320-l I
360 l
400 O
1000 2000 3000 4000 5000 6000 FIGURE A-14 Weston Gecphysical
STATION :
',,1N B ERN ARDlHO No. 51 VELO CIT Y,
FPS w,,
3 O
5000 10,000 D.*"'
"O#
W. L.
Elev.
I';0 8 '
r Sartby loom
/i 10 100 j'c -
Clay, sand 1953 h
" 9'*"I
,O Younger alluvium Of 50 c.
w
- ;c r
o-
~ (*.
Gravel and sand
- *o Vs V
o',
p 10 110
? 'O.
'.o[.0 4
10 0 Older alluvium
~
/,,' '
125 Gravel, sand, s
sitt and clay u.
O, I 500 t-O G.
a w
m c
m O
E w
Early Pleistocen, m
D 130 Continental depo sits 3
g 1000 compacted gravel j
sand silt and clay g
y u
o c
IM Pliocen.
e g
indurated clays-a m
l xx OIorific g
gx 5000 x
basement m
x O
I O
j H
O X
o E
N c
U N
I u
x aox x
I 10'000 FIGURE A-15 Weston Geophysical L
Vs IN FEET /SECOND
/- ORIGINAL 0
1000 2000 3000 4000 5000
/ GROUND SURFACE O
i i
i i
I L_
l COMPARISON OF I
SHEAR WAVE VELCCITY COLUMNS 40
/
/
l SAN BERNARDINO HALL OF RECORDS l
vs.
I MIDLAND l
80-l 1
I I
l l
120 l
l l
l l
16 0-l l
i I
I C 200 ml E
el a
81el r
o 240 gll j'
o l
s 5
o o
el 5
l l
e1
$I 280-EI I
5A!
//
RANGE IN DEPTH TO HIGH VELOCITY l
/, /
LAYER IN MIDLAND SITE AREA 320-l I
l I
360 l
l l
l I
I I
I 400 O
1000 2000 3000 4000 5000 6000 FIGURE A-16 Weston Geophysical
STATION :
COL TON, t:DISON SU S.
N' 3d VELOCIT Y,
FPS w,n a
con,.n, Dmier 945' O
5000 10,000 pcs W L.
Elev.
i A
'O o3
,' 'e 4
73'90 0
1941 > so.
Sand and g ovel l
O o
g o
n o o
7 g
l l0 Gravel and clay 4
1933 >
o
' E O
I 20 100 1
50 1952 >
E E
a i
.oc l
~
0 3
s s
~a o
w I
[E H
l 1956 >-
q o
=
v v
p 4
s g
25 95
~
Sand I
I 1
10 0 E
7;'7 Clay and gravel I
Sand i
40 110
/
Clay y
's
- f H
I i
Older alluvium Sands, gravels, I
125 g
silts and clays O
= 500 i
8 5
a
-/
e w
a o
a i
7 Early Plei stocene en 1
01 330 Con tinen tal N
L
_U.
8 Ol
~
depo sit s, conipacted l
Ol 9
gravel, sand,
/
E I
w I
r sitt and clay e
o g
[oo 1000 j
l I
I l
y o
g c
j Pliocene
,e l
,/
indurated clays N
l c
~
I Ui 8
5 I
xx I
E U
5000 1
I 'I'I
- g 168 x
i i
o ba sem ent i
=
x v
e i
_ x oo e
E i
o O
T w
1 N.
_ x cu i
e c
l x
I x
l 10,000 FIGURE A-17 I
wesbn Geophysical L
jf f!l E
E o '5 E w-4 3
2 2
2 1
2 8
4 0
6 M
6 1
8 4
0 0
O 0
0 0
0 0
0 O
O o
Ll l
1 1
0
/
i 0
0 0
0 0
2 2
0 I
i 0
0 0
/
V 0
0 NoASBm5*gEa6 s
LI llIIllgl1Illil !
l l
lllI lll lq I
N F
3 I ll1 I 1IIIl )IlII1, E
0 l
'-sEo 3E 0T 0
i 0
/
0 S
0 EC O
S N
0 D
lV C S 0
I
/
A H 4
4 0
/
' L i
0 E
I A
0 0
0
/l
.F R
]
E W C
V Y N S
M EG M
O E P
5 RE I
N VA 5
0 NN L
0 I
I D vS ER i
0 0
0 SU LI S 0
MD A.
O O I
B DE N
L P S
C N D
T I
T A
T O
W N H A Y
[
e DT T
F O
I C
st 6
S O
GO O
RR o
I H N
n F 0 I
EG L
i OI T
0 I
G I
0 U
UI G
G A H C M NN e
U RV O
DA o
R EE L
S N
L p
E AL T S U
h O
y O
R s
A C
F i
N A
c IT al 8
1 Y
C E
V IN FEET /SECOND r ORIGINAL s
t 0
1000 2000 3000 4000 5000
/ GROUND SURFACE O
i i
i i
i i
i L_..q l
l I
COMPARISON OF 40-
/
SHEAR WAVE VELOCITY COLUMNS _
~
~
~
~
l TARCENTO, ITALY l
VS.
l MIDLAND 80-O I
zl 0
5 E
- !l 120 E
16 0-E i'"
~
l 5
m
$ 240-E E
2-
/ /
RANGE IN DEPTH TO HIGH VELOCITY
/ /
LAYER IN MIDL AND SITE AREA 320-l 360 E
I I
I I
I I
O 1000 2000 3000 4000 5000 6000 FIGURE A-19 weston Geophysico!
r M
M M
M M
M M
M M
M eccekerograpb 7
E x'
3<$
[
/(~~
l j )\\]
gi N
/
/
X
\\
ASSURED ROCds 2ometers
/ N
?
G s
Nd
\\
(
g\\
V = 0.8 k'm/seh
\\
j q
)q g
l mm-amesswase==AeaaAe*h -
COMPETENT ROCK v = 2,5 k'm/sec p
scale, 1'500 5
$ Soil Profile at Accelerograph Station Tolmezzo 3
k j Reproduced from F i cr.
7, Muzzi and Vallini, 1977 O
E b
l i
V IN FEET /SECOND ORIGINAL
[ GROUND SURFACE s
0 1000 2000 3000 4000 5000 0
1 I
i I
I COMPARISON OF 40-
/
SHEAR WAVE VELOCITY COLUMNS
'/
TOLMEZ ZO, lT ALY i
l VS.
" - - - ~ - - - ~ ~~ - - -]
MIDLAND 80-l l
1 1
12 0 l
I s
l l
160 1
I Io S
N lw C 200 d
I l
e
=
r E
I E
l
$ 240 280-E
//'
RANGE IN DEPTH TO HIGH VELOCITY
//
LAYER IN MIDL AND SITE AREA 320-E 360 I
400 O
1000 2000 3000 4000 5000 6000 FIGURE A-21 Weston Geophysical
t ime e j
1 YN$
5 t sC CE M RIPT ION Le e s e te very sense ( 9 ). Bally, s eedy. ftse t e g es r Se GR4%L L.
enth ett e s t at al t e rDi e 5 er Deu!4 ell DelOe Il it.
as 1
1 as 20
.?
E b
0 8
E l
q;_
I (tery tard drillleg at 39 ff.,
ses*the8 le IStsryl a
Tee ha e.re s.es,i.e
.t i e.spie s
?
co tete eed.
rt. e or E
f recesery. Secove red segeeste rorrespondes to cercles or o
,E 5
a pe s ee se feet, drininas et So 1 e
a Des & de r s )
E E
pet doen pressere and adenss ted 2 8
I
$ft. In appres. 3 assetes) 1 E
80 w
a; Ee E
E I
h iih in tf E RPL4 9 47104 CfAsPLITLD 19/$/14 5
DGa l esG I
Elevo t ton:
Appres teetely $110 f eet. msL IUSG4 tope,gr aphie g=ed. )
Loc a t i on :
16 f ee t f rom accolosograph station Da t e soer c e 5W-AA (19 7 7 bl i
Equ & seen t
- embile D-41 hollow stee Auger f
Aege r ed t-19 f eet seap l ang only cut t tog r e t. ur ri e.
l
,s.t.r.d.nd. rot a.r y co,e. and esept ed.cett. sag w a t ene to telow 39 f eet I.
tte pt ed z..
betecen se nd f.et.
Vf Lrr IT t t $:
Isot Ava t l able
- 9Attet, S W - A.A { 19 7 7b l BU ILD !s Q A l t hougi t r.e s t a t ion has t.een discont inued, t he a cc e l e r -
og rapn at ene t;na ted Cali f orate bent ea s i d s ng 46074 feet D r i ve ) wee loc a t ed i s t %* da y t a g*.t be oemen t (grade le se 4 3 of e one stor y st ruct ure.
m 7t r.
1p medror a es e not encount ered wit hin t he dept h of the bor ir.g.
l lE
SUMMARY
LOG 6074 PARK DRIVE WRIHTW
, CALIFORNI A E
E Reproduced from Fig.
A-73, Shannon & Wilson and Agbabian Associates, 1980 FIGURE A-22 Weston Geophysical
f Vs IN FEET /SECOND r ORIGINAL 2000 3000 4000 5000
/ GROUND SURFACE
- 1000, 0
O i
i I
l 1
l I
COMPARISON OF SHEAR WAVE VELOCITY COLUMNS _
40
/ L' ;/-- /
WRIGHTWOOD i
OI VS.
OI MIDLAND I
E 80-oI El 3
S 120 j
e 2
160-0 200-E a
E I
o 240 280-
/ /
RANGE IN DEPTH TO HIGH vel.OCITY
/ /
LAYER IN MlDL AND SITE AREA 20-E 360 l
400 i
O 1000 2000 3000 4000 5000 6000 FIGURE A-23 Weston Geophysical
..