ML20032B156
| ML20032B156 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 10/31/1981 |
| From: | Brady A, Mork P INTERIOR, DEPT. OF, GEOLOGICAL SURVEY |
| To: | |
| Shared Package | |
| ML19252B616 | List: |
| References | |
| 81-1214, NUDOCS 8111040685 | |
| Download: ML20032B156 (21) | |
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United States Department of the Interior Geological Survey Seismic Eng,ineering Data Report
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PR'0CES'E6 ACCEL'EROGRAMFROMMONTICELLODAM, S
JENKINSVILLE, SOUTH CAROLINA, 16 0CTOBER 1979, 0706 UTC
~
by P. N. Mork and A. G. Brady OPEN FILE REPORT 81-1214 Prepared on behalf of the National Science Foundation Grant CA-114 This report.is prelimary and has not been reviewed
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.for conformity with U.S. Geological'Su Wef' editorial standards.
Any use of trade names is.for descriptive purposes only and does not imply endorsement by th,e USGS.
Menlo Park, California October 1981 g.-
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5 Processed-Accelerogram from Monticello Dam, Jenkinsvilla, South Carolina,16 October 1979, 0706 UTC This report serves first to document a magnetic tape containing the results of
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processin,p the strong-motion data from this accelerogram, and second to i
reproduce the more important graphical results. The record follows, by a little more than one year, three records that were described in our March 1981 -
~
Open File Report 81-0448 to which reference may be made for a description of the site, records, and processing.
Digitizing was carried out by 10M-T0WILL of Santa Clara, California, and USGS processing has produced plots of acceleration at three stages of correction, corrected velocity and displacement, and response and Fourier spectra.
Numerical data is available on magnetic tape from the Enyironmental Data and extension 6473, or (ITS)f3hn Boulder., Colorado, 80302; phone (303) 499-1000 Information Service, 'iOAA i
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6473'.
The special processing required for the evidently visible 25 and 35 Hz content has-tasulted in the following plots. " Raw data" signifies the input to the correction scheme, and corresponds to uncorrected data of Caltech and USGS p.rocessing. These data are interpolated at 500 points /second, and the plot is labelled " Interpolated / decimated". Butterworth filters whose corner 2
frequencies are 3 db down are used to band pass the interpolated data between the low frequency limit of 1 Hz (with n = 1:, first order) and the high
- frequency limit of 50 Hz (n a 2,.second order). These plots are labelled
" Filtered / windowed".. The.second page of plots for each component contains the acceleration, velocity and displacement with the instrument correction applied. All plots are scaled so that the peak.value, listed in the title, fills the vertical-ax'is.
The respcnse spectra plots, both linear and tripartite, contain plots from 1
~
to 25 Hz, or 0.04 to 1 second. The high frequencies, up to 50 Hz, are portrayed in the Fourier spectra plots.
Tape format The tape celiverea to EDlS, Boulaer, Colorado for dissemination purposes contains two files:
- 1. Uncorrected data, or the ' raw data" of the plots; three components.
2.. Corrected acceleration, velocity and displacement, as described above; three components.
.~
The tape characteristics are: Blocked, fixed length, 80-byte card image, 2000 byte block size (that is, 25 cards), unlabelled, 9-track, 800 bpi, ASCII.
Reference:
A. G. Brady, P. N. Merk and J. P. Fletcher, " Processed Accelerograms from Monticallo Dam, Jenkinsville, South Carolina, 27 August 1978 and Two Later Shocks", USGS Open File Report 81-0448, March 1981.
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U.S. STR0hG-MOTION hETWORK DIRECT 10h*
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