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{{#Wiki_filter:, _ _ _ _ _ _ | {{#Wiki_filter:, _ _ _ _ _ _ | ||
N | N | ||
. l | . l | ||
. arTC.QhjiL- | . arTC.QhjiL- | ||
.r k[$U,[.3hed p - | .r k[$U,[.3hed p - | ||
'l DUKE POWER COMPANY l OCONEE NUCLEAR STATION l I N I I | |||
'l DUKE POWER COMPANY l OCONEE NUCLEAR STATION l | |||
I N I | |||
I | |||
l | l | ||
, $jg- , | , $jg- , | ||
; DUKE POWH I g . | |||
; DUKE POWH I | |||
g . | |||
k 7 911280 h y [ | k 7 911280 h y [ | ||
1 I | 1 I | ||
A Report on the Seismic Activity at Lake Jocassee Between March 1 and May 31, 1978 | A Report on the Seismic Activity at Lake Jocassee Between March 1 and May 31, 1978 | ||
) | ) | ||
Pradeep Talwani, Principal Investigator and | Pradeep Talwani, Principal Investigator and Don Stevenson, Jin Chiang, Jeanne Sauber and Jim Whitworth Geology Department University of South Carolina Columbia, S. C. 29208 O | ||
Don Stevenson, Jin Chiang, Jeanne Sauber and Jim Whitworth | |||
Geology Department University of South Carolina | |||
Columbia, S. C. 29208 | |||
O | |||
1 | 1 IllTRODUCTI0fl During the reporting period seismicity was monitored at Lake Jacassee. | ||
IllTRODUCTI0fl During the reporting period seismicity was monitored at Lake Jacassee. | |||
Low level (averaging about one event per day), lor magnitude (f!L 42.0), | Low level (averaging about one event per day), lor magnitude (f!L 42.0), | ||
shallow (Z q 4.5 km) activity was recorded in the vicinity. | shallow (Z q 4.5 km) activity was recorded in the vicinity. | ||
SEISf1IC STATION DEPLOYMENT Up to five portable seismographs (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 , | SEISf1IC STATION DEPLOYMENT Up to five portable seismographs (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 , | ||
Figure 2. In identifying the sites in later discussion and in tables, the location number (first column) is used. The deployment times at various sites are shown in Figure 1. In &rch, BL2 was taken out and temporarily used for a noise survey for selection of permanent sites (at Limber Pole mountain and BG3). | Figure 2. In identifying the sites in later discussion and in tables, the location number (first column) is used. The deployment times at various sites are shown in Figure 1. In &rch, BL2 was taken out and temporarily used for a noise survey for selection of permanent sites (at Limber Pole mountain and BG3). | ||
RESULTS Events were located using a computer program, HYP0 71 (lee and Lahr, 1972) and a velocity model developed for the Clark Hill reservoir area (Appendix II). The location accuracy is about t 200 m while the depths are usually good to | RESULTS Events were located using a computer program, HYP0 71 (lee and Lahr, 1972) and a velocity model developed for the Clark Hill reservoir area (Appendix II). The location accuracy is about t 200 m while the depths are usually good to | ||
* 400 m. | * 400 m. | ||
In the reporting period (March 1 - May 31,1978) 81 events were recorded. | In the reporting period (March 1 - May 31,1978) 81 events were recorded. | ||
Of t'ese 41 events were located and are shown in Figure 2 and listed in Appendix IV. The activity was scattered throughout the Jocassee network. | Of t'ese 41 events were located and are shown in Figure 2 and listed in Appendix IV. The activity was scattered throughout the Jocassee network. | ||
During the period-(March 1 - May 31, 1978) six events with magnitude greater than 1 were recorded, and are listed in Table 1. The largest were magnitude 1.5 events on April 11 and May 23, 1978 Figure 3 shows l 1 | During the period-(March 1 - May 31, 1978) six events with magnitude greater than 1 were recorded, and are listed in Table 1. The largest were magnitude 1.5 events on April 11 and May 23, 1978 Figure 3 shows l 1 | ||
the location of all the located events between flovember 8,1975 and May 31, 1978. l l | |||
the location of all the located events between flovember 8,1975 and | |||
May 31, 1978. l l | |||
j i,0 i | j i,0 i | ||
3 | 3 | ||
- s i | - s i | ||
Y s | Y s | ||
| Line 100: | Line 54: | ||
t l | t l | ||
i 0 A 3 | i 0 A 3 | ||
l | l L | ||
I i 0 R i 2 P s | |||
i 0 R i 2 P s | |||
A 1 i e r | A 1 i e r | ||
u g | u g | ||
| Line 114: | Line 66: | ||
2 R A | 2 R A | ||
1 1 | 1 1 | ||
M s 0 i 1 | M s 0 i 1 1 | ||
1 | |||
_. 1 | _. 1 | ||
. 8 3 S L T M | . 8 3 S L T M | ||
2 D S L G T F M B B K O P S | 2 D S L G T F M B B K O P S | ||
3 JOCASSEE EARTHOURKES FROM MARCH 1 TO MAY S1, 1973 c''"e , , . . . . . . | |||
3 | |||
JOCASSEE EARTHOURKES FROM MARCH 1 TO MAY S1, 1973 c''"e , , . . . . . . | |||
f9. f8. f7. po. p5. f4. f:. ; l | f9. f8. f7. po. p5. f4. f:. ; l | ||
\T | \T Ls-[' .,, | ||
Ls-[' .,, | |||
..,y,, . | ..,y,, . | ||
: i. : | : i. : | ||
(. a | (. a | ||
, L.: . s sy;9 :a l ._, | |||
, L.: . s | |||
sy;9 :a l ._, | |||
[h / J- .1 | [h / J- .1 | ||
\m . | \m . | ||
; | ; | ||
\ ,/ <N | \ ,/ <N | ||
- 4*)/ : ,- .- | - 4*)/ : ,- .- | ||
: . ,. , c : o L. | : . ,. , c : o L. | ||
; | ; | ||
m _ | m _ | ||
T G5 .. | T G5 .. | ||
= | = | ||
( o Q,g ; , n. 5 I | |||
( o Q,g ; , n. 5 | |||
I | |||
[L)h | [L)h | ||
_J | _J | ||
-9 A.st. * | -9 A.st. * | ||
; ,9'^r : | ; ,9'^r : | ||
a - | a - | ||
""t$ | ""t$ | ||
| Line 174: | Line 100: | ||
g .- -.- | g .- -.- | ||
, 'li'W"s ]' | , 'li'W"s ]' | ||
i | i pt2 . | ||
pt2 . | |||
.c | .c | ||
^ | ^ | ||
h A , | h A , | ||
-(= v-c e ,t(, L ,. | -(= v-c e ,t(, L ,. | ||
D/ ' | D/ ' | ||
% Nr e p <,- w,. .. | % Nr e p <,- w,. .. | ||
| Line 193: | Line 114: | ||
+- . m- yOu, v,semm | +- . m- yOu, v,semm | ||
\, v., s,. | \, v., s,. | ||
A & . 7.Jf' ,m | A & . 7.Jf' ,m gn . cat w.DJ ye caj 35 o d %F | ||
gn . cat w.DJ ye caj 35 o | |||
d %F | |||
'j. - | 'j. - | ||
._ss.s | ._ss.s 9 y (g f J y) 2 5.0 l r i i i i i 8 I.;,:.,t' c., | ||
9 y (g f J y) 2 5.0 l | |||
r i i i i i 8 I.;,:.,t' c. | |||
-.ss.s h, b. % _ f | -.ss.s h, b. % _ f | ||
.3 y~ -~ l i i I i i I i | .3 y~ -~ l i i I i i I i | ||
| Line 213: | Line 122: | ||
O a + X 0 i i | O a + X 0 i i | ||
.i | .i | ||
-1. c. 1. 2. 3. 4. O. 1. 2. 3. 4. s. 1 | -1. c. 1. 2. 3. 4. O. 1. 2. 3. 4. s. 1 MAGNITUDE DEPTH (MW . ! | ||
MAGNITUDE DEPTH (MW . ! | |||
Figure 2 | Figure 2 | ||
4-4 f-l TABLE 1 | |||
4- | |||
4 | |||
f-l TABLE 1 | |||
. LIST OF EVENTS ML*I e | . LIST OF EVENTS ML*I e | ||
t | t TIME (UCT) | ||
; OATE('78) H:M Mt l 04:04 09:11 1.4 04:11 00:49 1.5 l | |||
TIME (UCT) | 05:12 13:39 1.4 05:12 14:15 1.3 i . | ||
; OATE('78) H:M Mt | |||
l 04:04 09:11 1.4 04:11 00:49 1.5 l | |||
05:12 13:39 1.4 | |||
05:12 14:15 1.3 i . | |||
05:23 08:07 1.2 | 05:23 08:07 1.2 | ||
; 05:23 12:29 1.5 | ; 05:23 12:29 1.5 | ||
.t i | .t i | ||
I a | I a | ||
i j .~ | i j .~ | ||
r a e J | r a e J | ||
l | l e | ||
i i | |||
t. | |||
E | E | ||
5 | 5 JOCASSEE EARTH 00AKES 3g . . . . . . , | ||
JOCASSEE EARTH 00AKES 3g . . . . . . , | |||
p9. f6. 53. | p9. f6. 53. | ||
fB. f7. f5. f4. g | fB. f7. f5. f4. g | ||
\_fb m ,, | \_fb m ,, | ||
^ | ^ | ||
, 2. s e | , 2. s e | ||
^ | ^ | ||
g _.i . a | g _.i . a | ||
. " O e | . " O e c o 2. , | ||
c o 2. | |||
O ' | O ' | ||
, , e O o s., o .= .. | , , e O o s., o .= .. | ||
3 C.. | 3 C.. | ||
73-Oh W-O o 0 e + *O | |||
73- | |||
Oh W-O o 0 e + *O | |||
... eo o , ,2 g., | ... eo o , ,2 g., | ||
- . s' , : | - . s' , : | ||
gg | gg | ||
: e. > | : e. > | ||
p' ..e | p' ..e | ||
_ p. e . | _ p. e . | ||
.a c. | .a c. | ||
m .s e | |||
m .s | |||
e | |||
& :*esQS o. 'a | & :*esQS o. 'a | ||
;r$ | ;r$ | ||
s*3. la" | s*3. la" | ||
~ | ~ | ||
~ ,,., | ~ ,,., | ||
.BR%2 | .BR%2 | ||
.p. e e af) | .p. e e af) er y. "L=e 'w T . 27. c. | ||
er y. "L=e 'w T . 27. c. | |||
l":,.>l ' ~06 | l":,.>l ' ~06 | ||
=e@ D _sr.c e . | |||
=e@ D _sr.c | |||
e | |||
e: | e: | ||
4- | 4- | ||
+ | + | ||
s | s | ||
,]f =... | ,]f =... | ||
c ' | c ' | ||
shM | shM y ., | ||
y ., | |||
a n.o | a n.o | ||
_ 4 8 + | _ 4 8 + | ||
+ _ss.s . | + _ss.s . | ||
p.gg 0 | |||
p.gg | i , , , , 5, (KN4 ,p / 55- | ||
- 4, | - 4, | ||
_n . s I I I I I b I | _n . s I I I I I b I | ||
&( 1 | &( 1 | ||
- o e 0 0 0 0 A + X 6 ~ | - o e 0 0 0 0 A + X 6 ~ | ||
-1. O. 1. 2. 3. 4. O. 1. 2. 3. 4. 5 MAGNITUDE DEPTH (KM) | -1. O. 1. 2. 3. 4. O. 1. 2. 3. 4. 5 MAGNITUDE DEPTH (KM) | ||
Figure 3 | Figure 3 S | ||
S | |||
6 | 6 t | ||
In Figure 4, the seismicity is compared with water level fluctuations. | |||
These data are plotted on the same time axis for the period March 1 to May 31, 1978. Starting at the top are the daily water level readings at 8 A.M. (local time). The bars indicate the maximum and minimum water level for that day. In the ordinate,100 feet corresponds to a full pond elevation of 1110 feet above sea level. The daily variation of water level (computed for readings at 8 A.M. 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. | |||
These data are plotted on the same time axis for the period March 1 to May 31, 1978. Starting at the top are the daily water level readings at 8 A.M. (local time). The bars indicate the maximum and minimum water level for that day. In the ordinate,100 feet corresponds to a full pond elevation of 1110 feet above sea level. The daily variation of water level (computed for readings at 8 A.M. 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. | |||
Starting the 16th of May there is a* large decrease in the water level, without an' immediate corresponding change in seismicity. | Starting the 16th of May there is a* large decrease in the water level, without an' immediate corresponding change in seismicity. | ||
Figure 5 shows data over a three and a half year period (January 1975 - | Figure 5 shows data over a three and a half year period (January 1975 - | ||
| Line 369: | Line 200: | ||
l The drastic drop in water level does not appear to have an associated . | l The drastic drop in water level does not appear to have an associated . | ||
change in seismicity. | change in seismicity. | ||
l l | |||
l | l | ||
H Ivd - | H Ivd - | ||
O. | O. | ||
-.s ,j | -.s ,j | ||
.;. , | .;. , | ||
6 w : i | 6 w : i w | ||
95 - - i i . .. | |||
i . .. | |||
'I . | 'I . | ||
w 90 - 'n i; F- , | w 90 - 'n i; F- , | ||
4 . ! ! | 4 . ! ! | ||
I. | I. | ||
> 85 - | > 85 - | ||
' ~ | ' ~ | ||
, i-- | , i-- | ||
| Line 407: | Line 220: | ||
is is ii si is si is si 's | is is ii si is si is si 's | ||
->p ii s i[ | ->p ii s i[ | ||
is | is | ||
.i I si is | |||
; ! | ; ! | ||
i' is | i' is | ||
.l' ni i; | .l' ni i; | ||
O g4 '10 -- M - | O g4 '10 -- M - | ||
Z;w N ii - | Z;w N ii - | ||
; | ; | ||
. <( i p-. H ;- 1 - - | . <( i p-. H ;- 1 - - | ||
l- 4 4 ll 11 11 11 11 lll 11 Il 11 11 Il i 11.i 11' j 11 Il 11 Il | l- 4 4 ll 11 11 11 11 lll 11 Il 11 11 Il i 11.i 11' j 11 Il 11 Il | ||
!. IF . . . | !. IF . . . | ||
1: | 1: | ||
.!!>- <( :ja _ ., . | .!!>- <( :ja _ ., . | ||
-j. ;' . . Li: J. | -j. ;' . . Li: J. | ||
l'O Q | l'O Q 1:.oc | ||
1:.oc | |||
_ l | _ l | ||
[ t | [ t | ||
.w mN .12 - | .w mN .12 - | ||
- J :i . | - J :i . | ||
i | i | ||
_~]f | _~]f | ||
[I | [I | ||
[[-- | [[-- | ||
Z:0 .10 - i ; | Z:0 .10 - i ; | ||
n | n i | ||
i | |||
, j '. WlQd i i, ,si i i i ,i i i e ;ii. g -- | , j '. WlQd i i, ,si i i i ,i i i e ;ii. g -- | ||
I.;;..r::i!; | I.;;..r::i!; | ||
ii is is i si l si i, i , | |||
ii | |||
is | |||
is i si l | |||
si i, | |||
i , | |||
1 | 1 | ||
- .9; 20 ~ . ;.i: I | - .9; 20 ~ . ;.i: I | ||
.l:,\:vj >~ 1 - . . | .l:,\:vj >~ 1 - . . | ||
i | i | ||
.l | .l | ||
,l . ... :g | ,l . ... :g | ||
<( - ' | <( - ' | ||
l; | l; | ||
.!i, .( li ; . | .!i, .( li ; . | ||
'', mQ _ '' '.- ' | '', mQ _ '' '.- ' | ||
l '}---::i 10 - | l '}---::i 10 - | ||
: .:iO.N | : .:iO.N m . | ||
m . | |||
; .. | ; .. | ||
~ | ~ | ||
- ' 0 w | |||
- ' 0 | ll ll 11 I . Il I 11 11 ll ' ' "ll". ll __ l 11 .I I . 1 11 11 ..J I I s: | ||
ll 11 I . Il I 11 11 ll ' ' "ll". ll __ l 11 .I I . 1 11 11 ..J I I s: | |||
10 20 30 10 20 i 30 . - 10 i 20 : | 10 20 30 10 20 i 30 . - 10 i 20 : | ||
.t*30.. | .t*30.. | ||
s-MARCH ! APRIL MAV 'i!!i.2 i - | |||
s- | |||
MARCH ! APRIL | |||
MAV 'i!!i.2 | |||
i - | |||
Figure 4 fi978 - l'i i : a :.-- | Figure 4 fi978 - l'i i : a :.-- | ||
h em - | h em - | ||
1 | 1 | ||
| Line 550: | Line 285: | ||
.g ., | .g ., | ||
8 6 3 '* | 8 6 3 '* | ||
)a%%% 1 400 I | )a%%% 1 400 I 111 ' | ||
111 ' | |||
E ,200 - | E ,200 - | ||
0 - | 0 - | ||
,,,U _b - _ | ,,,U _b - _ | ||
| Line 560: | Line 292: | ||
,_, p , _ , - | ,_, p , _ , - | ||
_, n y$-200 - | _, n y$-200 - | ||
-400 - | -400 - | ||
' ' ' ' s | ' ' ' ' s | ||
, ;, a i r r i . . . . i . r . , ,, ,,,,,,, | , ;, a i r r i . . . . i . r . , ,, ,,,,,,, | ||
e u- | e u-ioo 2: a2 -aa f" | ||
n E dus .A ;- . 2- _yk.I. . | |||
ioo 2: a2 -aa | |||
f" n | |||
E dus .A ;- . 2- _yk.I. . | |||
4 Lt ,_ ._, . _ | 4 Lt ,_ ._, . _ | ||
a is - l 12 | a is - l 12 | ||
[]. ; b u [I | []. ; b u [I JUNE DEC. JUNE DEC. JUtJE DEC. | ||
19 75 1976 1977 1978 Figure 5 | |||
JUNE DEC. JUNE DEC. JUtJE DEC. | |||
19 75 1976 1977 1978 | |||
Figure 5 | |||
* a | * a | ||
9 | 9 C0tiCLUSI0flS Low level seismicity in still continuing in the vicinity of Lake Jocassee. | ||
C0tiCLUSI0flS Low level seismicity in still continuing in the vicinity of Lake Jocassee. | |||
l | l | ||
) | ) | ||
i 1 | i 1 | ||
l | l | ||
O APPENDIX - | O APPENDIX - | ||
I l | I l | ||
I l . | I l . | ||
l | l | ||
^ | ^ | ||
AI | AI | ||
; A5PENDIX I d. | ; A5PENDIX I d. | ||
; | ; | ||
; | ; | ||
STATION LOCATIONS | STATION LOCATIONS No. Stn. Lat. N. Lona. 'J. | ||
No. Stn. Lat. N. Lona. 'J. | |||
J | J | ||
, 1 BL2 34 57.92 82 57.24 1 | , 1 BL2 34 57.92 82 57.24 1 | ||
i 2 KTS 34 56.00 82 53.08 < | i 2 KTS 34 56.00 82 53.08 < | ||
l r 3 BG3 34 59.58 82 55.90 | l r 3 BG3 34 59.58 82 55.90 4 ODL 34 55.82 82 57.26 5 MCS 34057.12 83 00.45 i | ||
6 PFS 34058.50 83 00.29-7 SMT 34 55.85 82058.26 8 ELJ 34 59.05 82 54.57 1 | |||
4 ODL 34 55.82 82 57.26 5 MCS 34057.12 83 00.45 i | 1 l | ||
6 PFS 34058.50 83 00.29-7 SMT 34 55.85 82058.26 8 ELJ 34 59.05 82 54.57 | |||
1 | |||
l | |||
O 4 | O 4 | ||
h I | h I | ||
i I. e | i I. e | ||
'. \ | '. \ | ||
A2 ~ | A2 ~ | ||
1 I | 1 I | ||
APPEb' DIX II | APPEb' DIX II VELCCITY MODEL ' | ||
HYPO 71 was used to locate various events. The crustal codel used is Velocity Depth b/see b 5.75 0 6.2 0.5 8.1 30.0 s | |||
VELCCITY MODEL ' | |||
HYPO 71 was used to locate various events. The crustal codel used is Velocity Depth b/see b | |||
5.75 0 6.2 0.5 8.1 30.0 | |||
s | |||
.. This ex) del was developed for the Clark Hill reservoir - also located on gneissic rocks in the South Carolina Piedmont (Taiwani, 1975). | .. This ex) del was developed for the Clark Hill reservoir - also located on gneissic rocks in the South Carolina Piedmont (Taiwani, 1975). | ||
~ | ~ | ||
e 4 | e 4 | ||
I . | I . | ||
i | i l | ||
l l . | |||
l . | |||
A3 - | A3 - | ||
] | ] | ||
I i | I i | ||
~ | ~ | ||
APPENDIX III | APPENDIX III LIST OF EVEllTS FROM MARCH 1 - MAY 21,1978 In colu=n 3 the " station of max. duration" refers co the location of a station where the recorded duration event was maximum. The station nu=ber corresponds to that listed in Appendix I. The maximum recorded duration for any event is given in column 4 In colu=n 5 are listed the total ne=ber of stations recording the event. The daily energy release is listed in column 6. The daily energy is calculated using a simplified magnitude - energy relation (Gutenberg and Richter, 1956), i.e., | ||
log 10 E = 11.8 + 1.5 Mg where M t = calculated duration magnitude. For Jocassee (Talwani and others, 1976) | |||
LIST OF EVEllTS FROM MARCH 1 - MAY 21,1978 In colu=n 3 the " station of max. duration" refers co the location of a station where the recorded duration event was maximum. The station nu=ber corresponds to that listed in Appendix I. The maximum recorded duration for any event is given in column 4 In colu=n 5 are listed the | F( = -1.83 + 2.04 log D where D = duration of event in seconds. Events with magnitude 7 1 are listed in colu=n 7. . | ||
total ne=ber of stations recording the event. The daily energy release is listed in column 6. The daily energy is calculated using a simplified magnitude - energy relation (Gutenberg and Richter, 1956), i.e., | |||
log 10 E = 11.8 + 1.5 Mg | |||
where M t = calculated duration magnitude. For Jocassee (Talwani and others, 1976) | |||
F( = -1.83 + 2.04 log D | |||
where D = duration of event in seconds. Events with magnitude 7 1 are listed | |||
in colu=n 7. | |||
e b | e b | ||
9 O | 9 O | ||
f | f | ||
A4 | A4 | ||
/ | / | ||
APPENDIX IV , | APPENDIX IV , | ||
LOCATIOt 0F EVEtlTS FR0i1ftARCH 1 - May 31, 1978 | LOCATIOt 0F EVEtlTS FR0i1ftARCH 1 - May 31, 1978 Computer printout of HYPO 71 showing data for location of events. | ||
Computer printout of HYPO 71 showing data for location of events. | |||
Cole =n 1 Date. | Cole =n 1 Date. | ||
Column 2 Origin time (UCT) h.m.sec. | Column 2 Origin time (UCT) h.m.sec. | ||
| Line 714: | Line 365: | ||
Colu=n 7 No. of station readings used to locate event. | Colu=n 7 No. of station readings used to locate event. | ||
P and S arrivals from same stations are regarded as 2 readings. | P and S arrivals from same stations are regarded as 2 readings. | ||
Colu=n 8 Largest azimuthal separation in degrees between stations. | Colu=n 8 Largest azimuthal separation in degrees between stations. | ||
Column 9 Epicentral distance in km to nearest station. | Column 9 Epicentral distance in km to nearest station. | ||
Column 10 Root mean square error of time residuals in sec. | Column 10 Root mean square error of time residuals in sec. | ||
A RMS=[R t /NO, where R is the time residual for the ich station. | A RMS=[R t /NO, where R is the time residual for the ich station. | ||
Colu=n 11 Standard error of the epicenter in km . ~ | |||
Column 12 Standard error of the focal depth in km . | |||
* Statistical interpretation of standard errors involves assumptions which may not be met in carthquake locations. Therefore standard errors may na: represent actual error limits. | * Statistical interpretation of standard errors involves assumptions which may not be met in carthquake locations. Therefore standard errors may na: represent actual error limits. | ||
If ERH or ERZ is blank, this means that 2:cannot be computed, because of insuf ficient data. ' | If ERH or ERZ is blank, this means that 2:cannot be computed, because of insuf ficient data. ' | ||
O g e o | O g e o | ||
1 | 1 | ||
. . A5 | . . A5 | ||
| Line 735: | Line 381: | ||
STN OF NO. OF ENERGY ; | STN OF NO. OF ENERGY ; | ||
/ | / | ||
TIME MAX. DURATION STN REC. PER DAY l DATE H:M:S DURATION (SEC) EVENT (ERGS) ML ?> 1.0 78:03:02 11:27:12 3 5 3 11.19 78:03:05 23:44:46 1 4 4 10.89 78:03:06 11:12:09 6 4 5 10.89 78:03:11 14:37:34 6 5 5 11.19 | TIME MAX. DURATION STN REC. PER DAY l DATE H:M:S DURATION (SEC) EVENT (ERGS) ML ?> 1.0 78:03:02 11:27:12 3 5 3 11.19 78:03:05 23:44:46 1 4 4 10.89 78:03:06 11:12:09 6 4 5 10.89 78:03:11 14:37:34 6 5 5 11.19 78:03:17 12:28:24 6 3 1 10.51 78:03:18 04:28:39 6 2 2 e 12:36:56 6 2 1 20:35:02 6 3 1 10.71 78:03:21 04:37:49 3 3 4 05:12:46 3 6 4 11.48 78:03:22 09:18:26 3 2 4 9.97 78:03:24 16:37:15 3 6 4 11.43 | ||
78:03:17 12:28:24 6 3 1 10.51 78:03:18 04:28:39 6 2 2 e 12:36:56 6 2 1 20:35:02 6 3 1 10.71 78:03:21 04:37:49 3 3 4 05:12:46 3 6 4 11.48 78:03:22 09:18:26 3 2 4 9.97 78:03:24 16:37:15 3 6 4 11.43 | |||
( 78:03:25 00:43:12 3 14 4 12.56 78:03:29 10:42:11 3 3 4 10.51 78:03:30 01:39:08 ? 7 5 02:03:12 3 2 1 02:29:58 3 6 4 03:16:16 3 6 4 04:37:11 3 6 4 05:09:09 6 5 2 05:48:34 3 24 4 ' | ( 78:03:25 00:43:12 3 14 4 12.56 78:03:29 10:42:11 3 3 4 10.51 78:03:30 01:39:08 ? 7 5 02:03:12 3 2 1 02:29:58 3 6 4 03:16:16 3 6 4 04:37:11 3 6 4 05:09:09 6 5 2 05:48:34 3 24 4 ' | ||
05:57:46 3 3 2 ~~ | 05:57:46 3 3 2 ~~ | ||
06:10:50 3 2 2 06:10:54 3 7 4 | 06:10:50 3 2 2 06:10:54 3 7 4 07:02:26 2 13 4 08:37:28 3 2 1 13.38 78:04:01 11:53:28 3 6 5 11.43 78:04:04 09:11:23 2 30 5 13.57 1.4 78:04:08 15:15:01 1 15 ~ | ||
4 12.65 78:04:11 00:49:25 2 32 5 13.66 - 1.5 78:04:12 14:09:28 2 6 5 11.43 I | |||
07:02:26 2 13 4 08:37:28 3 2 1 13.38 78:04:01 11:53:28 3 6 5 11.43 | |||
78:04:04 09:11:23 2 30 5 13.57 1.4 | |||
4 12.65 78:04:11 00:49:25 2 32 5 13.66 - 1.5 78:04:12 14:09:28 2 6 5 11.43 | |||
I | |||
A6 STN OF NO.OF ENERGY TIME F%X. DURATION STN REC. PER DAY DATE H:M:S DURATION (SEC) EVENT (ERGS) | |||
A6 | M( > 1.0 78:04:17 17:20:51 1 2 1 9.97 78:04:18 11:16:27 1 4 3 10.89 7' .t:20 21 :01 :45 2 3 1 10.51 78:04:21 11:10:33 1 3 2 10.51 78:04:23 06:25:31 1 5 3 11.19 78:04:27 20:30:48 1 4 4 10.89 78:04:28 01:56:01 3 10 4 02:54:51 6 8 4 19:25:46 6 3 1 23:52:10 6 8 3 12.42 78:04:29 15:13:10 6 7 5 11.19 78:04:30 08:34:37 3 5 3 13:30:52 3 8 3 11.91 78:05:03 19:05:20 1 2 3 9.97 I | ||
STN OF NO.OF ENERGY TIME F%X. DURATION STN REC. PER DAY DATE H:M:S DURATION (SEC) EVENT (ERGS) | |||
M( > 1.0 78:04:17 17:20:51 1 2 1 9.97 78:04:18 11:16:27 1 4 3 10.89 7' .t:20 21 :01 :45 2 3 1 10.51 78:04:21 11:10:33 1 3 2 10.51 78:04:23 06:25:31 1 5 3 11.19 78:04:27 20:30:48 1 4 4 10.89 78:04:28 01:56:01 3 10 4 02:54:51 6 8 4 | |||
19:25:46 6 3 1 23:52:10 6 8 3 12.42 78:04:29 15:13:10 6 7 5 11.19 78:04:30 08:34:37 3 5 3 13:30:52 3 8 3 11.91 78:05:03 19:05:20 1 2 3 9.97 I | |||
78:05:05 23:01:20 1 2 3 9.97 78:05:09 06:14:47 3 3 4 08:29:38 2 14 5 12.56 78:05:10 03:32:46 2 34 5 13.74 78:05:11 20:11:33 3 5 3 11.19 78:05:12 08:32:05 1 2 2 09:29:56 1 2 1 , | 78:05:05 23:01:20 1 2 3 9.97 78:05:09 06:14:47 3 3 4 08:29:38 2 14 5 12.56 78:05:10 03:32:46 2 34 5 13.74 78:05:11 20:11:33 3 5 3 11.19 78:05:12 08:32:05 1 2 2 09:29:56 1 2 1 , | ||
13:39:01 3 28 4 1.4 13:40:25 3 6 1 14:15:17 3 34 4 1.3 14:24:43 3 4 1 16:20:15 1 5 1 13.93 | 13:39:01 3 28 4 1.4 13:40:25 3 6 1 14:15:17 3 34 4 1.3 14:24:43 3 4 1 16:20:15 1 5 1 13.93 | ||
. 7c:05:13 01:34:13 1 2 3 07:09:25 1 2 1 10.27 | . 7c:05:13 01:34:13 1 2 3 07:09:25 1 2 1 10.27 78:05:14 00:43:50 1 8 5 - | ||
78:05:14 00:43:50 1 8 5 - | |||
06:03:35 1 2 1 11:09:39 1 4 2 . | 06:03:35 1 2 1 11:09:39 1 4 2 . | ||
11:09:55 1 9 5 11:12:04 1 2 1 11:23:18 1 2 1 12.30 | 11:09:55 1 9 5 11:12:04 1 2 1 11:23:18 1 2 1 12.30 | ||
STN OF N0.-0F ENERGY TIME MAX. DURATION STN REC. PER DAY DATE H:M:S DURATION (SEC) EVENT (ERGS) ML > 1.0 78.05:18 09:05:06 1 2 1 10:59:01 1 2 1 12:55:05 1 2 2 10.45 78:05:19 06:06:52 1 6 5 09:27:17 1 3 2 11.48 78:05:20 02:04:29 2 8 4 11.81 78:05:21 01:52:20 3 2 1 9.57 78:05:22 09:27:50 1 3 4 20:41:52 3 2 1 10.62 , | |||
STN OF N0.-0F ENERGY TIME MAX. DURATION STN REC. PER DAY | |||
DATE H:M:S DURATION (SEC) EVENT (ERGS) ML > 1.0 78.05:18 09:05:06 1 2 1 10:59:01 1 2 1 12:55:05 1 2 2 10.45 78:05:19 06:06:52 1 6 5 09:27:17 1 3 2 11.48 78:05:20 02:04:29 2 8 4 11.81 78:05:21 01:52:20 3 2 1 9.57 78:05:22 09:27:50 1 3 4 20:41:52 3 2 1 10.62 , | |||
78:05:23 08:07:13 2 30 5 1.2 12:29:24 2 35 5 1.5 | 78:05:23 08:07:13 2 30 5 1.2 12:29:24 2 35 5 1.5 | ||
.12:31:10 3 5 3 12:32:28 3 2 1 15:22:53 3 2 2 13.99 78:05:26 16:33:11 3 10 5 12.11 78:05:27 04:52:02 2 3 4 10.51 78:05:31 13:46:/.1 2 4 2 10.89 I | .12:31:10 3 5 3 12:32:28 3 2 1 15:22:53 3 2 2 13.99 78:05:26 16:33:11 3 10 5 12.11 78:05:27 04:52:02 2 3 4 10.51 78:05:31 13:46:/.1 2 4 2 10.89 I | ||
| Line 781: | Line 401: | ||
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| Line 892: | Line 486: | ||
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| Line 923: | Line 511: | ||
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| Line 943: | Line 525: | ||
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Revision as of 09:04, 1 February 2020
| ML19316A120 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/14/1978 |
| From: | Chiang J, Stevenson D, Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC |
| To: | |
| References | |
| NUDOCS 7911280645 | |
| Download: ML19316A120 (20) | |
Text
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1 I A Report on the Seismic Activity at Lake Jocassee Between March 1 and May 31, 1978
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Pradeep Talwani, Principal Investigator and Don Stevenson, Jin Chiang, Jeanne Sauber and Jim Whitworth Geology Department University of South Carolina Columbia, S. C. 29208 O
1 IllTRODUCTI0fl During the reporting period seismicity was monitored at Lake Jacassee. Low level (averaging about one event per day), lor magnitude (f!L 42.0), shallow (Z q 4.5 km) activity was recorded in the vicinity. SEISf1IC STATION DEPLOYMENT Up to five portable seismographs (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 , Figure 2. In identifying the sites in later discussion and in tables, the location number (first column) is used. The deployment times at various sites are shown in Figure 1. In &rch, BL2 was taken out and temporarily used for a noise survey for selection of permanent sites (at Limber Pole mountain and BG3). RESULTS Events were located using a computer program, HYP0 71 (lee and Lahr, 1972) and a velocity model developed for the Clark Hill reservoir area (Appendix II). The location accuracy is about t 200 m while the depths are usually good to
- 400 m.
In the reporting period (March 1 - May 31,1978) 81 events were recorded. Of t'ese 41 events were located and are shown in Figure 2 and listed in Appendix IV. The activity was scattered throughout the Jocassee network. During the period-(March 1 - May 31, 1978) six events with magnitude greater than 1 were recorded, and are listed in Table 1. The largest were magnitude 1.5 events on April 11 and May 23, 1978 Figure 3 shows l 1 the location of all the located events between flovember 8,1975 and May 31, 1978. l l
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6 t In Figure 4, the seismicity is compared with water level fluctuations. These data are plotted on the same time axis for the period March 1 to May 31, 1978. Starting at the top are the daily water level readings at 8 A.M. (local time). The bars indicate the maximum and minimum water level for that day. In the ordinate,100 feet corresponds to a full pond elevation of 1110 feet above sea level. The daily variation of water level (computed for readings at 8 A.M. 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. Starting the 16th of May there is a* large decrease in the water level, without an' immediate corresponding change in seismicity. Figure 5 shows data over a three and a half year period (January 1975 - May 1978). Each data point represents a 10-day period. From top to bottom: .first row shows the average water level in Lake Jocassee over a 10-day period, with the bars indicating the maximum and minimum water level in that 10-day perir 2. The change in water level between the 10-day mean water levels is shown in the next row. In order to quantify this change, the area in each segment, below and above the zero (or no change) line was calculated in arbitrary units. This ' change time' , representing the duration and amount of change, is plotted in the next i row. This was compared with the total number of events (in 10-day l l period) and the times of events with magnitude greater than 2 were noted. l The drastic drop in water level does not appear to have an associated . change in seismicity. l l l
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9 C0tiCLUSI0flS Low level seismicity in still continuing in the vicinity of Lake Jocassee. l
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O APPENDIX - I l I l . l
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; A5PENDIX I d.
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STATION LOCATIONS No. Stn. Lat. N. Lona. 'J. J
, 1 BL2 34 57.92 82 57.24 1
i 2 KTS 34 56.00 82 53.08 < l r 3 BG3 34 59.58 82 55.90 4 ODL 34 55.82 82 57.26 5 MCS 34057.12 83 00.45 i 6 PFS 34058.50 83 00.29-7 SMT 34 55.85 82058.26 8 ELJ 34 59.05 82 54.57 1 1 l O 4 h I i I. e '. \
A2 ~ 1 I APPEb' DIX II VELCCITY MODEL ' HYPO 71 was used to locate various events. The crustal codel used is Velocity Depth b/see b 5.75 0 6.2 0.5 8.1 30.0 s
.. This ex) del was developed for the Clark Hill reservoir - also located on gneissic rocks in the South Carolina Piedmont (Taiwani, 1975). ~
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APPENDIX III LIST OF EVEllTS FROM MARCH 1 - MAY 21,1978 In colu=n 3 the " station of max. duration" refers co the location of a station where the recorded duration event was maximum. The station nu=ber corresponds to that listed in Appendix I. The maximum recorded duration for any event is given in column 4 In colu=n 5 are listed the total ne=ber of stations recording the event. The daily energy release is listed in column 6. The daily energy is calculated using a simplified magnitude - energy relation (Gutenberg and Richter, 1956), i.e., log 10 E = 11.8 + 1.5 Mg where M t = calculated duration magnitude. For Jocassee (Talwani and others, 1976) F( = -1.83 + 2.04 log D where D = duration of event in seconds. Events with magnitude 7 1 are listed in colu=n 7. . e b 9 O f
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APPENDIX IV , LOCATIOt 0F EVEtlTS FR0i1ftARCH 1 - May 31, 1978 Computer printout of HYPO 71 showing data for location of events. Cole =n 1 Date. Column 2 Origin time (UCT) h.m.sec. Cole =n 3 Latitude (N) degrees, min. y Column 4 Longitude (W) degrees, min. 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. Column 9 Epicentral distance in km to nearest station. Column 10 Root mean square error of time residuals in sec. A RMS=[R t /NO, where R is the time residual for the ich station. Colu=n 11 Standard error of the epicenter in km . ~ Column 12 Standard error of the focal depth in km .
- Statistical interpretation of standard errors involves assumptions which may not be met in carthquake locations. Therefore standard errors may na: represent actual error limits.
If ERH or ERZ is blank, this means that 2:cannot be computed, because of insuf ficient data. ' O g e o
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TIME MAX. DURATION STN REC. PER DAY l DATE H:M:S DURATION (SEC) EVENT (ERGS) ML ?> 1.0 78:03:02 11:27:12 3 5 3 11.19 78:03:05 23:44:46 1 4 4 10.89 78:03:06 11:12:09 6 4 5 10.89 78:03:11 14:37:34 6 5 5 11.19 78:03:17 12:28:24 6 3 1 10.51 78:03:18 04:28:39 6 2 2 e 12:36:56 6 2 1 20:35:02 6 3 1 10.71 78:03:21 04:37:49 3 3 4 05:12:46 3 6 4 11.48 78:03:22 09:18:26 3 2 4 9.97 78:03:24 16:37:15 3 6 4 11.43 ( 78:03:25 00:43:12 3 14 4 12.56 78:03:29 10:42:11 3 3 4 10.51 78:03:30 01:39:08 ? 7 5 02:03:12 3 2 1 02:29:58 3 6 4 03:16:16 3 6 4 04:37:11 3 6 4 05:09:09 6 5 2 05:48:34 3 24 4 ' 05:57:46 3 3 2 ~~ 06:10:50 3 2 2 06:10:54 3 7 4 07:02:26 2 13 4 08:37:28 3 2 1 13.38 78:04:01 11:53:28 3 6 5 11.43 78:04:04 09:11:23 2 30 5 13.57 1.4 78:04:08 15:15:01 1 15 ~ 4 12.65 78:04:11 00:49:25 2 32 5 13.66 - 1.5 78:04:12 14:09:28 2 6 5 11.43 I
A6 STN OF NO.OF ENERGY TIME F%X. DURATION STN REC. PER DAY DATE H:M:S DURATION (SEC) EVENT (ERGS) M( > 1.0 78:04:17 17:20:51 1 2 1 9.97 78:04:18 11:16:27 1 4 3 10.89 7' .t:20 21 :01 :45 2 3 1 10.51 78:04:21 11:10:33 1 3 2 10.51 78:04:23 06:25:31 1 5 3 11.19 78:04:27 20:30:48 1 4 4 10.89 78:04:28 01:56:01 3 10 4 02:54:51 6 8 4 19:25:46 6 3 1 23:52:10 6 8 3 12.42 78:04:29 15:13:10 6 7 5 11.19 78:04:30 08:34:37 3 5 3 13:30:52 3 8 3 11.91 78:05:03 19:05:20 1 2 3 9.97 I 78:05:05 23:01:20 1 2 3 9.97 78:05:09 06:14:47 3 3 4 08:29:38 2 14 5 12.56 78:05:10 03:32:46 2 34 5 13.74 78:05:11 20:11:33 3 5 3 11.19 78:05:12 08:32:05 1 2 2 09:29:56 1 2 1 , 13:39:01 3 28 4 1.4 13:40:25 3 6 1 14:15:17 3 34 4 1.3 14:24:43 3 4 1 16:20:15 1 5 1 13.93
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STN OF N0.-0F ENERGY TIME MAX. DURATION STN REC. PER DAY DATE H:M:S DURATION (SEC) EVENT (ERGS) ML > 1.0 78.05:18 09:05:06 1 2 1 10:59:01 1 2 1 12:55:05 1 2 2 10.45 78:05:19 06:06:52 1 6 5 09:27:17 1 3 2 11.48 78:05:20 02:04:29 2 8 4 11.81 78:05:21 01:52:20 3 2 1 9.57 78:05:22 09:27:50 1 3 4 20:41:52 3 2 1 10.62 , 78:05:23 08:07:13 2 30 5 1.2 12:29:24 2 35 5 1.5
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