ML19316A135

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Rept on Seismic Activity at Lake Jocassee,771201-780228
ML19316A135
Person / Time
Site: Oconee Duke Energy icon.png
Issue date: 04/04/1978
From: Chiang J, Stevenson D, Talwani P
SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC
To:
References
NUDOCS 7911280668
Download: ML19316A135 (19)
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A Report on the l Seismic Activity at Lake Jocassee Between December 1, 1977 and February 28, 1978 Pradeep Talwani, Principal Investigator and Don Stevenson, Jin Chiang, f Jeanne Sauber and Alice Drew 1

i Geology Department University of South Carolina Columbia, S. C. 29208 T

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1 INTRODUCTION During the reporting period seismicity was monitored at Lake Jocassee. Low level (averaging about one event per day), low magnitude (ML <_ 2.0) , shallow (Z _< 4.0km) activity was recorded in the vicinity.

SEISMIC STATION DEPLOYMENT Up to five portable seiscographs (Sprengnether MEQ 800 model) were used, together with Duke Power Company's permanent station at SMT. The location ~

of sites occupied are listed in Appendix I, and are shown in Fig. 2. In identifying the sites in later discussion and in tables, the location number (first column) is used. The deployment times at various sihs are shown in Fig. 1. Two seismographs were temporarily moved from the Jocassee network to Lake Keowee where there was activity. The seismograph which occupied location ODL was removed December 13th and was returned after the end of the reporting period. The other seismograph which occupied site BL2 was removed January 3rd and returned on February 8,1978.

l RESULTS Events were located by using a computer program, HYP071 (Lee and Lahr,1972) and a velocity model developed for the Clark Hill reservoir area (Appendix II).

The location accuracy is about 200 m while the depths are usually good to '

t 400 m.

In the reporting period (December 1, 1977 - February 28, 1978) 91 events were recorded. Of these 48 events were located and are shown in Fig. 2 and are listed in Appendix IV. The activity was confined to the southern half e

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) TABLE 1 EVENTS OF ML*I Date Time M L

3 (UCT) 771208 07:00:35 1.5 j 771222 16:15:28 1.8

! 771230 22:27:00 1.5 780202 18:19:35 1.8 780203 08:03:15 1.4

! 780205 13:08:50 1.1 780226 05:05:20 1.1 i

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of the Jocassee network. During the period (December 1,1977 - February 28,1978) seven events with magnitude greater than 1 were recorded, and are listed in Table 1. The largest were magnitude 1.8 events on December 22 and on February 2. Figure 3 shows the location of all the located events between November 8, 1975 and February 28, 1978. In Fig. 4, the seismicity is compared with water level fluctuations. These data are plotted on the same time axis for the period December 1,1977 to February 28, 1978.

Starting at the top are the daily water level readings at 8 AM (local _

time). The bars indicate the maximum and minimum water level for that day. In the ordinate,100 ft. corresponds to a full pond elevation of 1110 ft. a.s.l. The daily variation of water level (computed for readings at 8AM and plotted midway between them) is shown in the next row. The daily energy release and the number of events are shown in the two bottom rows. Thereappearstobe'noobviouscorrelationbetweentheseismicity and the water level or its fluctuations. Figure 5 shows seismic data for the period January, 1975, thru February, 1978. Each data point represents a ten-day period.

CONCLUSIONS Low level seismicity is still continuing in the vicinity of Lake Jocassee, although the frequency decreased.

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DECEMBER. JANUARY  : FEBRUARY 1977 i

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8 ed APPENDICES i

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AI A5PENDIX I STATION LOCATIONS Np. Stn. Lat. N. Long. W.

1 BL2 34 57.92 82 57.24 .

2 KTS 34056.00 82 53.08 3 BG3 34 59.58 82 55.90 4 ODL 34 55.82 82 57.26 5 MCS 34057.12 83 00.45 6 PFS 34 58.50 83 00.29 7 SMT 34 55.85 82"58.26 8 ELJ 34 59.05 82 54.57 i

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i, APPENDIX TI VELOCITY MODEL HYP071 was used to locate various events. The crustal model used is Velocity Depth km/see km

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5.75 0 6.2 0.5 8.1 30.0 This model was developed for the Clark Hill reservoir - also located on gneissic rocks in the South Carolina Piedmont (Talvani, 1975). ,

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A3 4 APPENDIX III LIST OF EVENTS FROM DECEMBER 1977 - FEBRUARY 28,1978 1 In Column 3 the " station of max. duration" refers to the location of a station where the recorded duration event was maximum. The station number corresponds to that listed in Appendix I. The maximum recorded j duration for any event is given in column 4. In column 5 are listed the total number of stations recording the event. The daily energy release

, is listed in column 6. The daily energy is calculated using a simplified d

magnitude - energy relation (Gutenberg and Richter,1956), i.e.,

log 10 E = 11.8 + 1.5 M L where M = calculated duration magnitude. For Jocassee (Talwani and others, L

1976),

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ML = -1.83 + 2.04 log D where D = duration of event in seconds. Events with magnitude > 1 are listed in column 7.

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i A4 APPENDIX IV LOCATION OF EVENTS FROM MARCH 1 - MAY 31, 1977 Computer printout of HYP071 showing data for location of events.

Colu=n 1 Date.

Colu=n 2 Origin time (UCT) h.m.sec. -

Column 3 Latitude (N) degrees, min.

Column 4 Longitude (W) degrees, min.

1 Colu=n 5 Depth (km).

Colu=n 6 Local duration magnitude.

Colu=n 7 No. of station readings used to locate event.

P and S arrivals from same stations are regarded as 2 readings.

Colu=n 8 Largest azimuthal separation in degrees between stations.

Colu=n 9 Epicentral. distance in km to nearest station.

Column 10 Root mean square error of time residuals in sec.

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RMS=]R t /NO, where R is the time residual for the ith station.

Colu=n 11 Standard error of the epicenter in km .

Colu=n 12

  • Standard error of the focal depth in km .
  • Statist'ical interpretaticn of standard errors involves assumptions which may not be met in earthquake locacions. Therefore standard errors may na: represent actual error limits.

If ER11 or ERZ is blank, this means that 2 canno: be computed, because of insufficient data.

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A5 STN OF NO. OF ENERGY TIME MAX. DURATION STN REC. PER DAY DATE H: M: S DURATION (SEC) EVENT (ERGS) ML >1.0 771201 01:23:14 1 2 1 02:43:59 1 3 3 04:44:22 1 3 1 10.87 771202 09:40:58 6 8 4 10:22:29 1 2 1 10:42:15 1 2 1 11.77 771203 02:06:53 1 2 4 02:09:26 1 3 6 02:09:47 4 3 6 02:12:54 1 2 6

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02:12:56 1 2 6 02:14:59 6 4 6 11.87 771204 00:28:54  ?  ? 5 771208 00:03:22 4 3 2 07:00:35 2 45 5 1.5 07:52:57 1 2 1 13:20:18 1 6 5 14.11 771210 01:35:30 4 3 2 01:11:38 4 1 1 10:06:38 4 2 1 21:34:37 1 3 1 10.88 771211 02:50:37 1 2 3 02:53:07 3 3 5 23:04:17 1 3 1 10.65 771213 17:45:44 1 2 3 9.97 771214 06:40:16 2 12 4 12.35 771215 01:31 :59 1 2 2 9.97 771219 03:06:50 7 6 1 11.43 771220 05:04:28 3 4 1 10.89 771221 03:53:16 6 2 2 9.97 771222 09:34:32 1 2 2 09:59:54 2 7 5 11:17:31 6 2 1 13:24:20 6 4 1 14:04:05 6 2 1 16:15:28 6 65 5 1.8 18:52:58 2 8 5 14.60

A6 STN OF NO. OF ENERGY I TIME MAX. DURATION STN REC. PER DAY DATE H: M: S DURATION (SEC) EVENT (ERGS) M]>1.0 L

771224 02:33:34 2 3 2 13:22:03 2 4 5 11.04 771226 10:02:05 3 2 2 9.97 771229 10:30:41 6 2 1 17:22:17 6 3 5 19:31:42 1 3 4 11.29 771230 22:27:00 2 47 5 14.17 1.5 771231 23:27:55 1 5 5 11.19 780101 23:22:47 1 3 2 1 0.51 780111 17:28:10 3 2 2 9.97 780118 06:23:36 3 3 4 10.51 780122 08:59:46 2 3 3 17:38:38 7 4 4 23:08:34 6 4 4 23:09:10 7 7 4 11.79 780124 09:47:13 o 7 4 11.64 780129 13:38:39 7 3 4 1 0.51 780202 18:19:35 7 60 4 1.8 18:19:51  ?  ? 4 18:27:36 3 2 2 19:48:33 2 10 4 20:50:14 3 5 1 21:10:23 3 3 4 21:47:45 2 8 4 22:47:34 2 9 4 14.49 780203 08:30:15 2 40 4 1.4 08:30:32  ?  ? 4 21:58:18 2 10 4 13.96 780204 19:19:35 2 3 1 10.51 780205 05:54:45 6 6 3 13:08:50 2 30 3 13.57 1.1 780206 09:37 56 3 4 10.89 780208 12:54:61 2 2 3 9.97

A7 STN OF NO. OF ENERGY TIME MAX. DURATION STN REC. PER DAY DATE H: M: S DURATION (SEC) EVENT (ERGS) M)>1.0 L

780210 21:27:22 1 5 5 11.19 780213 04:24:13 1 2 4 07:37:39 1 3 4 10.62 780214 04:35:10 1 3 4 11:47:09 1 3 3 10.81 780215 03:28:39 2 5 5 11.19 1

780217 23:51:58 3 10 5 12.11 780219 12:21:55 2 9 5 13:05:16 2 12 4 17:06:07 2 5 2 19:36:18 7 3 1 12.51 780220 17:12:45 1 2 1 17:22:12 1 2 3 17:26:10 1 3 3 10.71 780221 03:13:10 6 4 3 08:17:05 1 3 4 11.04 780222 02:05:49 1 4 4 18:46:24 6 4 2 11.19 780223 01:08:57 1 2 1 05:01:25 7 3 3 10.62 780224 01:09:53 1 2 5 9.47 780226 05:05:20 1 30 5 13.57 1.1 l

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DATE ORIGIN LAT N LONb e OEPTM MAG NO GAP OMIN RMS \

ERM ERZ GM 1 .. 771202 940 56.96 35- u.91 d2-57.87 3.21 0.01 10 2e5 J.9 0.06 0.6 0.7 C1 2 771203 2 9 25.76 34-50.T9 82-56.06 1 98 -0.e6 10 llo 2.6 0.01 01 0181 3 771203 4 9 40 15 36-56.79 82-56.04 2 16 -0.86 12 118 2.6 0.04 02 0.6 61 4

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. 771206 b28 53.18 34-58.lo 82-36.48 2.24 -0 11 12 132 1 3 0.06 0.2 04 81 6

771208 1 0 33.79 34-51 28 62-56.77 0.90 1 54 11 96 1.4 0.u6 0.2 0.5 81 77120d 1J20 17.99 34-50.37 82-55.62 1.25 -0 24 12 145 2.4 0.04 02 0.6 81

-.771210 c53 6.06 34-56.35 82-55 47 2.65 -0.56 8 156 2.4 0.05 8 0.+ 0.d 81 771216 040 15.09 34-50 17 d2-56.4J 2.79 0.J1 10 le* 2.9 0.03 U.1 0.3 61 9 771222, 959 53.07 34-58.2T 82-58 26 1 59 -0 11 10 192 1.T 0.07 10 - 771222 1015 27.21 34-36.be 03 0 6 C1 d2-55.e0 4.02 1 81 6 158 3.0 0.04 0.7 0. 61 11 771222 Ic52 57.29 36-d0.60 e2-55.94 3.56 12 771229 1122 16.06 3*-56 94 0.01 10 IJ5 4.9 0.02 0.1 0.4 81 62-55.9e 3.73 -0.40 10 129 2.e u.03 01 0381 13-- _771229 1931 40.80 3*-56.76 82-56 02 3.71 .-0 36 10 IJ5 .2.d 0.12 .0.1 0 2 81 --

14 7e0103 21 9 7.39 34-58.29 82-55 66 0.83 -0.60 6 231 2.* U.09 15 780118 623 34.5d 36-5d.09 1.1 4.6 Cl-62-56.24 2 78 -0.86 6 406 2.o 0.01 01 01C1 16 780122 oS9 35.25 34-53.67 82-57.66 17 2 38 _-0.e6 6 201 1.3 0.02 10 03C1 7d0122 1i38 37.06 3*-56.31 82-57.34 1.04 -0.60 8 143 1.6 0.02 01 0.3 81 le 780122 2J 8 32.76 J -56.J3 82-57.30 0.28 -0.60 8 142 1.e 0.01 01 0161

_ ___ __ 19 __780122 2J 9. 9.34 34-50 32 d2-57 38 ._1.23 20 -0 11 8 144 1.o 0.02 01 0.3 61 7d0124 v47 11.74 3*-56 20 82-b6 20 2.52 -0 11 8 104 3.2 0.05 0.3 U.7 81 21 760129 1J38 38.37 36-56.52 82-55.*6 22 1 52 -0.86 8 149 3.8 0.01 01 0.3 81 780dO2 1e19 36.79 34-56.53 82-55.*9 _1.15 1.60.16 111 .3.8 0.04 _0 1 0 6 el 23 760202 1966 32.22 34-50.46 82-55 52 _ _.

24 1.23 0 21 8 152 J.d 0.01 00 0.3 81 760202 2110 22.25 3*-56.62 82-55.59 1.46 -0.80 a 146 4.0 0.02 01 0.5 di 25 780202 2147 44.53 34-56 65 82-55 52 26 1.72 0.01 8 1*3 3.9 0.01 0.0 04 61 750203 o30 14.00 3*-56.e4 82-55.99 1.76 1 44 14 104 3.8 0.06 02 0.6 el 27 780203 2158 17.33 36-56.5d 82-55.59 1.82 0 21 8 146' *.0 0.03 02 0.7 81

- - --- 2296 - 780205 356 62.78 3*-31.80 82-59.41 1.85 -0.24 6 209 2.7 0.03 0.3 0.7 C1 760205 1J 8 49.02 34-54.35 82-54.69 3.42 1.18 12 147 3.9 0.06 0.2 Jo 7e0206 937 56.23 34-56.e6 d2-55.61 1.88 0.6 81

-0.60 8 142 4.1 0.03 02 0.7 61

-- -- -- 31 32 - 760208 1254 59.5J 34-36.39 .82-55.73 - 0.91. -l.22 6 led _4.0 0.03 -1.4 3.9 C1 -

780210 2027 21.40 34-S6.55 82-57.3d 1.87 -0.40 10 127 1.9 0 03 0.1 33 7e0213 *24 12.2d 34-51.99 82-55.26 0.2 el 1.13 -1.22 6 15e 3.0 0.02 0.1 0.7 81

_. 3635- 780213 131 36.80 3*-56.55 82-58.15 .0.71 -0.86 6 237 -2.9 0.02 0.6 1.6 C1 780214 635 9.46 34-57.26 82-57.96 1.07 36 760214 11 7 8.31 34-51.13

-0.86 e 146 1.1 0.01 0.1 0.2 81 l 62-57.99 2.40 -1.22 6 155 2.* 0.01 0.1 0.3 81

3738. 7d0215 J38 37.88 34-56.61 82-50.0* 2.40 -0.40 10 153 J.3 0 02 .0.1 0.3 s1 1

I 760217 2J51 57.76 3*-58.29 82-57.02 1.98 0 21 to 159 0.8 0.02 01 0.2 81 39 780219 1221 5*.27 34-57.93 40 82-55.84 0.32 1.14 10 132 2.1 0.03 0.1 0.3 81 780219 IJ 5 10.17 34-56.30 82-55.80 1.72 0.31 8 264 2.3 0.02 0.2 U.3 C1 l

  • 1 780219 2J58 32.97 3*-56.20 d2-37.d1 0.19 -0.24 42 8 220 1.0 0.09 0.3 0.5 C1 7do220 1/22 11.50 3*-51.01 82-58.73 1.93 -1.22 6 181 2.3 0.02 0.7 0.6 C1 1

63 7d0220 ll26 10.1J 3 -51.13 l 52-be.82 1.69 -0.d6 6 188 2.4 0.02 0.7. 0.7 C1 '

46 7d0221 J13 10.17 3*-51.6e 82-58.74 1.6* -0.60 6 163 2.3 0.02 0.0 0.6 C1 45 760221 e17 5.32 36-56.69 d2-50.23 1.28 -0.66 8 Is0 1.1 0.02 01 0.2 81 46 __. 7o0222 4 5 47.96 34-59.68 d2-56.01 1.06 0.0 4 dst 4.4 0.02 0.0 0.0 C1 47 160223 3 1 24.27 36-5e.55 82-37.43 1.83 48 180226 s 5 19 15 34-51.d6

-0.86 6 202 1.d 0.01 0.1 0.2 C1 82-5e.77 0.u2 1.18 10 106 0.T 0.04 0.2 0.3 81 j l

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