ML20235F088

Marked-up Draft Seismological Analysis of Bodega Head,Ca

ML20235F088
Person / Time
Site:	05000000, Bodega Bay
Issue date:	12/17/1987
From:	Neumann F NEUMANN, F.
To:
Shared Package
ML20234A767	List: IA-85-665, Discusses Seismic Design of Nuclear Power Plants,Including Const of Nuclear Plants in Seismically Active Zones ML20234A761 ML20234A769 ML20234A792 ML20234A798 ML20234A803 ML20234A812 ML20234A816 ML20234A827 ML20234A830 ML20234A838 ML20234A841 ML20234A844 ML20234A847 ML20234A851 ML20234A855 ML20234A858 ML20234A861 ML20234A864 ML20234A868 ML20234A871 ML20234A874 ML20234A893 ML20234A896 ML20234A900 ML20234A911 ML20234A922 ML20234A929 ML20234A932 ML20234A937 ML20234A944 ML20234A956 ML20234A965 ML20234A968 ML20234A976 ML20234A984 ML20234A993 ML20234A996 ML20234A999 ML20234B005 ML20234B008 ML20234B023 ML20234B032 ML20234B035 ML20234B040 ML20234B062 ML20234B066 ML20234B076 ML20234B084 ML20234B098 ... further results
References
FOIA-85-665 NUDOCS 8709280408
Download: ML20235F088 (20)

Text

{{#Wiki_filter:.-. I f, ( / -) f' r v ' '\\ i 4 ,/ .'T S.,Ia.,0r Cv.I,v,..L m,.y, L,.,,a, r.: C;- ,.r v q

i..AD, Cr I-v,3.yIa a

www .:, o s .2 Ef. w.. ~ - _,, Introduction. This report nas baan pre.7ared at the request of the Division of Licensins and Reculation of the Atcric Enercy Cc =ission. Its purpoce is to c;.s. lyze the 201s:o10;f of Eodesc Head, California, the site of a nuclear.novar nis.nz.tro..cced b-J the Pacific G s and Electric Connany and to estimate O c strCn.~22: earthe.uske likely to be e.'cuerienced ,, + % e .,.,4 3 we u.e -.,.,.........., ,4 a,.,

a. w w w.. a s.

.e,,, a.wn u, n.. e3,, tn, g.,,.,..,0. g -.w mv o v..., wv w ..ww w w ....., o..., e., q n +w,., j. s ..v.. v... ...,.tc_,.,, .,,,,,,,e,/.e.e t.,d tw.,., w w,. .tublAv ed w- <ek aww. w. wo - - ' - - +. ~......... ~.. .W.. '. cwt.' e.n "._' c-d vi wh ^ a t%.c n wo~a C .%.~..<,.,e.. C.. s. f 3 a+ _1 c,c+.,.4 c Co,,p.,.ny v. v,, w. w + f. c,,o, w.m. t on Decs,...

c. ;,..s

.....j.,,.,j s ~ < e.._.m_f App e,..w,: 4 c o .....w., . w 'b u .a 5 C.>... a.o C14 _4 ,4/. -2..,...e.,., ,.,,c.w_... _-. e s .,. Os, ow +y o +. n e ,m r ..e b <td.a.e.,...,m..,,,,JA,g ..... -v,,.,. C ; .m., %. s,,,.,,. a.3 a + o +.., e .o A. .w w w. w-w.. v. v.. -. m u u w ..j .wC, 4.C -, Cf C w... c.: v,.~j.,.s...,.. m, j _a c,.O.,,s. rw 3 n C_ w,. v. _,... C,,,; ...w mw M .a.,,m.2. o1.c 4. w., C :' *. ..., ~,. 5 A ',..., Cf, j v,_ e w "v. r %.,.

• 3 :.C.ms. s -,

.-o,a , A.%.3s t. e. w; g s .w aw w.,,,,- w .s ..w o alSo be3n rcVic".70d. -,.u +. L..o..,.e .c, _,.,n w..,, w. ,.v,.- ..... _. n..., v..,,3 v,v.

c..,. w v,.,..>i..,

.,,,,c, ...g w w... .w.. .~ - ws + k.w, C,d,,+ n.1 C y,) .e,. C m. m.., e., .o,-.. ...,. o,Ic,.,.., _7 o., w s.v. ,. -.. a,y .e s v c e,,. wa .v w. wu. .v . w. ..v ,7 a n de.e. tw.c.,.ow,i w2 cvu.g.. .1 - o rov,.1 n,+ 4,,.nw y,.....,,.e....v.m.e.,.c.o w .w . v. ws.

w. w w.

w w--. cauce it to runture cr f; ult. Such ru.,turin.a., ;ets up violent vibrations which are trancritted to the carth's cu" face in a complex wave pattern. l l l 1 8709200408 851217 FOIA PDR FIRESTO85-66S i PDR

84 ' ( , a \\ i -,. 4.,. o., o ~,, s ~v., c3 .3.,, %n.. c e +a ,a.s in 1/.'.4.C h *".e v+.'.C.".- m., n e m e m a O.o + ',."u,nture '.e.,.. c.1 c'. cd. 2.~.~.. c s'. ,..o "..eV t ".' +,, " "...+'cr.a.^. 4 C 'w10.". v.#. 4 ^ .,m._ clonc thC fault surface u.reven.: cli.nn.in" u.til the stres:ec built u; a a e., .,., o 4v. m C.e n, ,,0 c.., Cv.., 4 u..,. , n...w, , C.4. wew., v, r s.... m v cuac- .w v. .w .w v v .m v .v is distributed uniformly OVar the entire fault curface (the so-Called .m e,,

a., ~ i n.w.G

.0s.., w.- w . ; G.,,y, w a N,,,L, O L,h4.CJ: vne VravC.3 sl,.0 - e u .v j. .w o v 4.*.h.>. om, t.. f1'C., Oc.yilf, ,.1e 4ny O\\. 2.. m, C.n. .e.,... c< C w e + w, +v e.,,, + .r n e .C .. as w -,. -t. > w s c . w. v r, , dv. g..* C *.*.,.'.' 0.'.o

• " c^.#.^u.'*. Su'."#^0 t' "'w

&"' C " 'v' l'/ v w s. b,y w a 4 " CrO'".,0 t.k.O e w u v .w, a .e 3,. s C n,... / t o C -, s.., v. u.7.<,;.,,.,m.;y.

r.,..r, + %. e C Ct,u.1 n. 4 n.3 c t n s e.,-- w3 0,0 s.~

o r v s uus s uvv

v. %

w n v. o v, ,+ 4 .n 3 C,o.l.i eu-Cm..,3 +90 C/w., v,.. ta4e 1 4.,..: + ;. o A + - ~ .s .4ww-0.,. O A TCs, 2.S vannc, c..~ w ~ .c., w v, u,~;, .sv.; nwp / th 0,i.u g., e,.,.,, V1'O,,,, + 4. <. O n,,,, ,A, n C C,,.,s-w-e., .,C.,.,,,,, . ;.3 e ,Os,, # Violw,nv

1. w m

vw - ~ a v. w .. j . - ~ ~ ' M c. c -.i 4..y-c.a 4 * ".,. -,, -.. '... .c.,.,., k. 7 OC .".,, C." c.' "' >.c,,ua'.'.a. .#. 0 C 4 ^ .1 r pi..... v v - 'y/ p v. w. o / ,,,, w.~.~_9 1,7 7...., .. ~. v .,. y..,,y. 4 9 w.e, gec. (.3 s 4.. L.,a t o... .e, w.~..,, e 2 .s. s. ,--. v..- 5. y 7 O..g. C w'.'.'w' '." ' ~ I .. u. s., _.:..-wv O.# C ,'e."v'.""., C '." ~wJ 0," o.' ' ' f 2 . aes .. v w ~ 1 1 m... 1,.: w,,... ,.p.....,,,,,4 ;a >. p. .~u. C a. *e - w. ,.,w -f,. - -,,,. e. u. s v,, -v.. . s. -.. v..- .~ v.~ p r.. 4 n,,.,. g...cf .s.> .r... .,.,..>;.o w? v,. ...~w.2.., . m. ., c c o m. .e.,. v-- e.n, e _ ,q v. s .v. ;, www l v, ~,Jsv.sg O Vv.,y C.9.w w, w \\,aw,. &4, ~.,,,s 1,. w s c, Cv,, ,. w 2 -,, w s a u.s ....c. -... -- w..~ ..y-u e. ~,v v w....na s sa s

w. v.

u.. av w. w c, ,y.7 g w-. 3 y.a.3.9 w k, *w v. w-il u e e 'l -w..,7,,,.,. C, w- +wO'".. .'.'w di e 'v o' " C e's" OA .'Lv 3 w :. 4 um u v-., . ww'.a ,.4

• 1
• O w, r.-,An n' L.c 3 9 s..-
• O,,.s..

_n,

1. o.

• _J.9.

-- w ,I.4*.o,A4O ,n i% De e.o, n6 a.s.... e~, w w .w. s w... .a. ~ ra,. %.,e.,,,,, . h..g 9...

e.,

y m y.,3., eg% ,.g g 45v. 4..,.,.4 q g % .r .A g v w gw np,,,.,,, aw 3 .,... ~ - c -s .v. u -vu w.v. ..,w,. w. 1 ] e

9.,/

p h I, - w e. ].. us e. e th.e.90 C,5.p 1S,, e O. S

4. h..,g

("I.s. e. .0C.. f. .gv u.J .d A n pg e q p p,,w g ,y v w i i 1

o l. . 4 ,o. -.'.."V.4"', O.# C' 9 . ".. ' +".w' w'*.~.,~.w' '..'.w.'" ' a". a1.4.".', M,~h, ' " c w- _# ' ^- w. u O v ~ % v,7v..4.- -w, 4_o,. .n-i+w,, e -...-.L - v L, m./ u, v cuc.k. ,,, e e tw.,., I,m,., u,,.,f .s. q.w-w nw., we w..w . w, b. .g. .e v

1. .wa 4 a.

~, w w On Ne..- O.e,. e,.,Lu..,,0,.+ C.,,Ob-. OI D,, <, C...Cnt, O w,.t. e ve sw... ww w. w v. w u nry -.p, ~.c e 4, e 1.....<., o.n ,3.~w, o.- aa cO..w ca ~wa -c,, c._w..g m v.. v. wj d U rock,incrc e3 vith dist nce PrC: the epicanter. tb5* W .g. e.,.C.1.,.p-.,,,, A w. w 2 v.e e,., A.,w u..w-s, , GnT.,, -..c,C. c3,,e.,, k, O C.9 4,, e.,, vw a-COe-lu;e.,.a O wwkm 0.o v -. s

4.,

t,q,,, O n ,..,.w.e.,,, +w,., in

w. Sao,.vf 15 ul.,ays ww w v

w w..v u - a s, e,g

f. :.,.s. ".C e ^. w.

.s>, 9 c.>2:.t e., .m,, a I.n +w..e C c..+w u., w .w v..ij v.3, w.. .,w-. w. V a, w.. C :. .. ;. s.. - gww L,.,,..,._,..s.j .,.m.._. ,,.. ~,, ed.4 eDuw,w/s f3 C O, .s ,y -www-- v- .v.. .w.; / w.s w. C;.

g. wjv... - *

\\ .v w w -j -.w.. ,...w... .w ./.. C. ',... w v..,, ~ n,.J .14.Cs j 3,S +w -w g w.. ,, w a,. e tt w C..., ,,f.. - w v v,.:;. a .../w-y dw w-w ...._w.w . s w.... w ..,., e.,, u w e O-s w e a,,,,,e.,.,. .............., C~e r..,....e .:..u .,.., n c.a. ,4 . w..,, wj s.... - w _ O.,,.. .u ww w w +a , O c,.

s...

ww v .p w, a.:.... .....e..- e. ,,,,,.n;,, CA :,,,, u,.. m 4 4. y 6.4,c, m .w,n o -sw J,.... ......w w.. w .ww. .,, w g ,s -..s.s, .u .w,w w,, .w w.. C.'". ' ' 40.4 ' ..^.a' .'.'."_.?, w'.', _, ' _ '. ' ' '. '. _ ". '. ' ...w'.'.'..w'.v'..,' ,',,',w"..'.""'- .h. A s '.'..*..^.".s' .'w w u. . c -- - - / v.a.., g O.... r.-.vv.,.... , w r.. .v.,.. 4 ,w..

,... % 7.

vw,+ w,,. w. .w ww.w wv w-w, w.. w .w,, .w w-. WV AdA. v-4em-.w e n. .v .w-. gsj w. '.) ,- y. w w 4...,j. w,, --, .<..a, ...a o., g,, ... ;..,. 4 C.3,+,,.. ,.:.s. e... .s.-. w. -w ,y /. w. .w.,,.,, v. w-., .w.- -'w.. c.:..,.,.. v,. v w.., w.... 4. , v _.,, p.,. y,. 'l w. .p v w. w..,, .L-- O.n o .,.,e, a. w ---w.. www-wL. v... f,,,, O... r v.v ..a.., . s a.. w.. gwwj ..-..-..-uv ..a.., V. coy v,., o e ,.mw .., >.. 4 3 e.,...,., 4 ~.a vva o-w s. L,..., :.;.. y .*.....ww,j w., w. w.J. s. af ....,. i 1 4. )% -9...k.,.,n.., .L.,,..3.,.'....,vf w - v,,

~-wsj s.

w. w. w. w w..s. .e, 7.w 7 o ,.L.-- Lu...4 s., T. 4.., A.* .c. A

3. a.

( ,u. 4. s ..w... w.., v A wu , w-sw j w-w w-v. w,, y m ,/ b :..,a, 4. .,w 4.J .t 4 n..;.e t.:,, (% a u-w (# -. v.,.. w w .,, v w, - ww -e e. ( w.,3 :... e.~ w g.,......., -- vw. w v . ?.i. ww, .. u.., w. 4,yv. < y$ w 4 p..; ~.,. m. ' w^ n C Oa'.'.w*w w' w^, ' 'v".'. O.C *."., u' i.C"- .e, .w v -w_ w /, ,,e., g... 4 ,,.-_....,...,.,.. s.'..,.e..i,* J,.,.4 n,,1 i J p-1 g %,r 'l e. ... g ~~.a. -.p j r,,

w..

C ' ' ' ~y g .w'.' " _. '. ' -.0."'.'.#* w."#..'v"".".*..","v..".' 4 .w.' n 5 *+v,V V ' 1F..', %"- C-I r 4 ^ ~' " w ),.. C v..m... 4...,4 sf3 .e,w.4,.,...4.,+,.

1. nw b* n.4 VGm. & 3/ O.e C, 7.c

• w,,4..,3

) .a u . v.... ww .,, a s. (' h s.-s.7 O.e m. v.3,,w,,,,q Oe,y (5.,,,s C.,,,,, )' j g -,.:_. O 4.,. o .,e.,.,*, .a a-v- .sw.w-wv /i w a. O. a. -v..,- :u i, a., c.,, \\ n)' a 4 k-4 y l l l i ] l 1 J l l

L e. (. 1 3 4 ? 4 w u m.s... n Oa.., r, e G:

4. a, c,,.. n; 4 m.,.,....,,4n 0

+v e.

z. e.s...

. s. c z.. -. .ua . v e a- ..aa - m_r. o..~ w w_' y.dfty "ilca no ".h. ,, 4.,.4 c u,,,. w -.,m..c,. c., ' ' w' C d ' 'v .d " c^* v """4 + w s .-w. v...N...rw.,., C.a s C O. r.v.a0 a., C., e., , e.1.e.C.h. 1.4 c, g,,,,. L*C.c. w Of,w.;10 th.., s.w 3y OA o ,o t .m n.s,,.e g..a %. -, ' +w, -s ca emn,.s n n.o g o " ~,..A.4 0-$ +wc, a ,r.o .m..t s aw.c cc.. 4 c- ,-,/.- +o _,wqi c,4c.u.. yae e.,w,." *t - cow, c.a oy,.,,b. c,.,- t, ..4_,. -e v v.. w v. . w v, u.., 'w e d a u e &> t O,, ~.'..' ".. ;'~ ".., 0'd, 4-c.no.*'ed by' C* a4 o 4 .v ..wv Pacific Gas and I'lactric Conpany'c,3c' 0;ical consultant to be " extensively o.,.

i..,

.r.& ad -".'1 +v.."ww'." %...v. ej0. "v o" tha U. v. G w* O' O ~,d.C S"wrVCy c a w . c w -w ~, . u n,,, ;. . c_3, o.... uJo4.g. aa Iaul ,,,,e ,.v,.. e a C,u,. Cr.e v c,. c..,. s. O w., '. A r,, e... r w.- us. ...u-m. w. m. ws. --., w %, m e n s ~, we .?< 01.= T,w..L. O w,. i. 4 a,. ~~.,,,.t & 4 .~wn... v,2 v w c. vw. ,.s v4 vww g; .w .v.. w.:w Tw,.s a1., O.w O..w a %sy J C.?..m+ws 4 r,. D.1 w-4,, c .:.

• u a.'

.Ias,. .k.O.,3 Vv .v J w v w.a w3. w. a.r,v.,

4. r.a w%,.

3 a.L uw ww s w . w a wu .. O., y w,, 7.35 O.e ....,,,.,,e a s + a. ,, e. J O,+ .,,..O. w.ww o. w .wa w s.o wv m,,,. r.. w..w w. .-w s 4 c.7,., e s. 6 4_.,., ov v.;, ., J v. e. u w. ..s.. .v., ..s,.. w .v a w ..,s w. s,.,., w 2 n w, .s.d ..., a..; y c.,,,. 3c ,,w,,, ,s..4..., e =.., w. .e...;, W. w.. b4 ...g =. m.,,

g. b W w

.e.,w...#. W, . w....e w i

4. h.e

. w w.e. e.. .--:,..6 7., w, -.e - A., y,,C..e.

• ...,ew

.. %.S ~. . v . u.. w, w., v. ww wwy w. T.,.,:,,,. A <...e .* y 4. e., u,.. /. -?- -w,-. w-... v>....,.... v.. , e s..... C.A. w w.es v, w,, e.. .w-.,..- vow --<w vw .ww. v. o i y ge.d.ed.bwC .,..h.,.,jg e; a.s 6,.. .,g C, w.,wg po /. w[ w,, w.4 9 /. %. ,e, .{ .s.a.k.e.e., e s w a.w C s,.l.gh m. a q g.3 ,w ..s. 9 -w A..s .. g JW .c.e. .g.wv .1. w w.. w. %.7. p m,,. i. ...s' ,,. J.:.W -.4 %.,*,.R.e y....2.- W w.m.% 4. w ww ) e, w w, v, na ..ge i t .w-y-.,._..,,.,, A %.. 1 c4 s.. y. 4 c t,,,%.. J Li m a..ew.... 4A, _w .r.r j . - s. m.. ...v w -, w.

4.,, u.

., sA - a.... :..., w.. .v-. n.,, . Ou w... d.- ,..,,a .a w. www wv w. .<v w... a so ~4 w. w w - wyOv.+ C' men JA ,m I.~l.a.d c. %.O t s v. 4

c..,4. v.a.1

/ n.a O th.C w w*,%...... .d.,., +..w .w g -e r vv y .w wws .a w.. w w . w ws o. w ww C. A., 4,. e. *, J,.. 'i

o..,7 +

n f gue.3 w, oe.e. g t

• m er

.,.) ..e. c, c., o +hw .e 4.,r.,-n.d > <. n. e w .., c. s w ww v v... w v.,,,. w -. u-w. 1 J

( e-7 ,,,.,4+ A k.,3..c.,%.4.,,+ O. ,, o ,.- 4, ,4_ v ~.1 a ..tla. s c ~.:. v v..w s..s.4. m.,. eA., L., w.......s .. v s.. w waw w v. .4 w .,~ w a I .%_,. 7,. ,v.w 4 A.. L. w,., p -.. .m. ..,J.3 C..,_.4..,._<.,. s,, ., Oj., #w w e: I .. W v- -a w .w s w. ..s.,.e.,,, e,,:,.,,. . L.m.a -. r.w w v..... 7.i.. . --v .., ee,-,.,.v,,, m._7 A w +,..,.e C1 .w. w, .W. v~...,,, w.s p O_.,, a 4..,.,,. a a. p....r _. o.,. u. -,,e... 0.,, e.3.,.,,.. - l..s, C,e O.e v., v n .e os ..M..- ~ ~- w v. -~ C, ~.. t, t - t, 0, t v,- - w v. r,.,. C .u ,.,,.. ~ ....~. .. p-, r...,.,. Os. A w..., unw O e a,.w. u m w .w.... - e 4 ~

r. 2,.a.. - -a C,.a.

...:' a. -.1 v. y. %.. .o. 0.,.e m L 4.ee... c 0 w,.,,, 1.,o u, yv, t. e. .~ w., ..w... w v-w.. .e. A m .s r n.s,. v,.4.n C. O.a.+- 6w,~ G.. n.,. C..*

• ov. s. w, p,<

a

• v,ee e

- v.3 e Jww .r.w r.y.c. 33- - a y-- Ca w 4 .w .;,O.. w e,,,e,s..,,,, A w.y.,, . C.s +

,. s..

.

4,. a 0..o ea w, .e.s o -,... - u 2,w., s ou c. 4 %., u., .w w~w .i*,., c.,,, 3, -w. v C. O.,,, v a-. 4.,, C v,,.a, w e, ~ a....:. 2 O v%.....a. 7 m2 c,.. 4_.n s c, O.. w,m.,,, C, e.#.wO -wi. n wf v-.w, u.m v ..s /. w, E.,..e -.=,.~ a s a a O,.O.. , a,a,. \\.:~.,.,-,,--,., ~,. , \\ ,,..v. -p .n. a. ) .e m, e. O, u.w. w, u . w

w....

.,%C.. .e,,.,.,,..., C3..s, w,.c., e O..w C ~.

s....

f . s, w....,r A ...w f,. 7 r. y 4.C,,.1 1 ), .w v-w, w m. %. v w C.+ s g CL. O e-

4. w e.

s,.,2....., n..n a .vs.. ve %-a. ..n. +.. l w 3.1 C.... w w w w. v..., O' _m,,... w. .v. w., m wvv

y..w 1

M.,.I

• ..w w.

w, v., w h.,.a j w

• A *

%..w.:.. g, p.*. ... / C w. j .r, v w., g ,,.. 3, \\ ow ...,,J....,. ..... v..y . +..., b w+ 3 m .m ..,4 ,a 4 ..,.s, s. '.*.=4.

s..

...,b. v.- w %, h..g .w e ww w w w ,, V yw, h y

• g.

Q v-* A.. g w.,, .j..o .Jb.. v. na, C.c. .u &.~ ~.,...v .<,,.. s,,.m.+..%..., ....,. w..,,...<.. .m..,,~.., 4,,, (, .w

w. w V.f..w. Lw

,N.Q.",#. .n M. wws.% Q M. w4. w .w .J w w 8j w'.'.

1. *...I..-

.) ...%..SM..9 pp M.,g.* pg 8 Ja wp - j... w.. w,., v i.. %,.. %.".1 3 .w., 3 O ' .e...,.... w O c,.,. w,.:. f. 4 ...,...s s,..%,, ,1r ,. +.. + '.. " '.. r... ws w. s w... .--w g-. .w p ww w.. w. .v. w C..,.....,m...,O ve.... 1. .w e. m,.. c, s.._.. s, /- Qe, ar ,.1.o.... ). v. w v (.j w g-vv ~ %. Ih / r..s ,7 e.m,y.,, w,

• 1..,

s w...., s% w ws Os.f.,

n.. w c,,.n..

O o., n., v..a w. A-- w ...4. a....vw N .s,,. ..w ~ r".' t %, w,') vs.w..wQ,.....g

• 7 *5 a,

+ r ..s.v.., A --s.,... m....s....,,...O]~,. eb - v w

h.. e, v

2. *4. ~,~.7..

^ ...y.i c...,. w. .sv w.. s. . w w.. -*4 s s ,t ~., .m.., C D w,,,..,.,. w 0,,a.., c.... v.' r v _... .%.,-}. i w. Olc., .i j c .a v. f ... w w..,. w w

( o 'b' ~C ~ e e. %..,,.,.,., u..,. m v,. ,.. %. v,, v,.,.4 c w..,.,,, .c ,.,c ,O k.,.. er,ew. s.... e .~.. vJ, w -svww

w. w...,

w. .. v w.. .s,.,.w., a. 3.,,,. %w. %. v., m,.e.. ,1,. s. .. w.. s.. -s, 4. , hcw..o. c w,..,..w o, t% w v w w ~ ...a, a .e...#...,.,. 4..., c.v s v v_3. a C. e. ma r.v <,.,. p.o, ,,., y +,,. e,.,.,... c a a.. e m. v.~ v ~s ..w. v.. I ' 1 l .. <.. e.:,i c._.. w,..'."%. ~... " O_' w~,... _~ s*, a', ..%. o v'.'.- c a". pe. ',,, "ohw' - ... w u, _s.

w., a..,. u., %,.n ts, w%.,.e.

.1..,,,., 4..a ~ w. w], e,,,, .~.. 7,,,,.; c o p., y n, e t.,. ... w w.. - w ww ~ ... w. s w -c c..u.., .,o %.w . -.y,. e m. w-.~. T.... a' o.n ' v, ~" W_e. mM 4 '.*vc. val ..+ .~ v 1

4. m,,

,,...."tj- ~. w m..,~'1 hw.~.n. soc'", c.'a.cc.b.a-h

• • 'w e." ".~^11 vi%v.

c ~a v. + v. ww. . r w.. .~ w the "rc:/.cncy of :.7 sc.t :;hoch; origir.atini else'.there along the Pacific f' i . v w,.g. wj .o..., " *.* C I g.-. d.h w F% s.g a. 4 $.l n .g.. Q C. g n.[ $.4w 'y I ag.eg m.A..M A (;;,.,.a* g ,, p 4 eW. g t. .a eq. w w 54

1. 1

. 3 e;,w v u. l .a ;,, w ,,.w.. 6...4..>.. v.o , 3, e ,p i a.3 3,.g.g,,y/ Co.%. t, w 13f C,y a.ny a 0cds,,. 2.10,, y ty, wm ,,eg. va-w v.. w ...w j. g o v .c. n w ".,' w.f .? s.

w. w w... p*...

%g *. .3 ...w . wy 6... w-, ,,,,,g 3,, t w. w w ,, w w w a....,. e., m, w w, ,. 4.C. .,,,g,/ Q.p y..,, 3 w r ..w ,s, ..w.., w, w. v... j we w ... w ww. w. w. e..a,,.t. n. w .e.. ~ w w...... ....eu d.r v,. - .w.....,..,., m C,,. w..g w w w w..( w - . w. sw w.s,... .3 .,y.., ,.,4 ..w .. m.,a_u,.<, s e. w. ..,.w s ...t w-, w gw., -..w. 4-. w V'..,,., m;. v.. - w w y. %. 3

• y O

.e %.Q w )' ' ..r. .. -f; Q w, -.sw -. v. ,,;..a ;, ,,..,..p sv .+. w --ww-w. s. l w v.. i. w. m,,.,4 vww ,y C.o ,-.y. v ,p j 4... a, a.... w _w vwL . wwwv... v. w- .. w..w w w. m.s w.. ...4 .s..., s,,... w.. A. .. O w /..., s *,

e..t,. a w 3/wu9 4,

e.... A,,

k. 4A.C.h.

/,*.:,,.3 s. 3., ...w j w. vws

w.. w..f

1. .v w. vt b6 v

,v. v.,e. J.,is., .,....a.e....,y g,..e, u.' w [.. 9 ..g . 2 g .-.e A.,g .d. .A.,...-q.... -4, . g ...g..,ga., g p.. w. q g q. g qbp .v e -a . w .. w . %. 3,.e%..'.3,,..,., .r,

s.., f.,

np a.... w. J .,e e. w 9... .,.,1 g, -e v s./.*,.ty.%.,.., 3.,.... .n ,. w w 4. / V.4 e..s.. ,.r....

w. 4 w w;ew w

w / o s. G 3". \\) .e..... .e, .j s w,. ( w.. v. .......w w a 4..,. C m r. O,.,......,.3 C.,,..., s, v.,,.,..,, 1.-,.- o s.u. .y,f.4 e.,1,.O..,., .e..Q w n. ws w ~ w. w... w v.. v. ... w.. . h. ' % 6. .'Cmh. J.7.m. Oe a.;,.,,".-- c.. s. +> w.N..... -.%, .t. - w s v, w w. aww .w,,, ..ww. i l

,h - U , (; ( , w.. #.y. y. ~w.,,... ., w .c. w w ,., c,.,.,..,.,,,..,C,.._, w......m.C w, m.,.e -ww

w. jw w sw. wv

..,,~..w v ._.. 4 m. .. e,,.,.m.wf. ...~,.,a u, ... a 6 ,t;m. v w. c. +,, qe,,C0 o ..wv. wj, .w w..,, s ww.... .v.,.C'.,.,,,,i..,.t,. . s,,, ., m.- m.

2. s.m ws.

>Cc,. .:.. ns. w., o w ,.,n., , O.4 w.~ w vvvoms n .w w w.. w -.w, v .,,, ?.,. .,e.,. v-.. v,,. O A a ss w ">.,.,.m,......,. .p.,,,*4 1. L,s.,,, /,4.,,,. e ...w G, C,.,. v, www w. w.. A-w .v 4 .r 4, w,. *..vw . O ., s...,., a.

w.

s.,. ,w.. ., e.... w ws L. ,,,., C.,. 1 - C,%,..,., -.4. i 0.',. C.c .t,,,.., w .g msv ws ' a....,,..... i n.... C.. w.e s... .: L s v.o 2 . i. ..w o.3. --r . g s .w r n.- .e.,. w,., w.n + s., ~ i v.. s.v - w v..

w. w s

v. .v w -.s. c.,.,7 s -.,%. C... /.,.,. C....... e.- w., ..o,,,3.. e.w.e, -Ow., ....,O .vww.e /, ..s. ,,,.3 e.. w. ...w w.e, e. a.... a. s

v... +

4 ,s n.. w..,. w.jj,. e. e w. b w,.;n .,.:., s.. C.. w

a. w,%me O. 4

.,J.. w - wbw w w-w we.

v... V

.s w .. r.1. n, W<.., w.. e w.. .3 .n.\\. s. w.., v. v.... w....., a, r

3. w...

2.,., ..,s .m C.,. s..: ?, aJ.7cm. ww -w-

v..a v

s.o., 6...i.,.,,$,,s....,.... , w .... s w. c. ..~,.. _.., O,;, w,1,0 y. r.,,, ,... f :..: - w .v wm scw w. C i w.~*. w" ."sf.'.'.'..'*w*.w' '.w* w#.*..';,"w'.'*'m'*w"a.,

• • C C '".+., ",..." u" C " "i w,

P.3 ** M .* b. 8g *,g, 6, vD J.h v,4 s. 4. f*, ..n~,**w.,.g g g 1.w.,3.,g ) q p .-..i...e .it, .w-

w. s w,

.g .w.w. w w. w.f v. +'.,w, .._ s n.. r. s,., ,,,w,..,, w. ww wW..,,.

4..

.,.,lw-.'.V Wd .&.3. ( %..u,.9.,*.3e ..,. i. ..w.4..w-,,, s s.. sc.., .w. ,.6 ..w te. w, ,' w.' w .I.=*.J,., ("

• = t.g I +...

. e- 's.,. ."..s. ,.w. wwwwwv.!e .S.e ** g e i... w w,,,.... s.... ww--... www w '.b , g .....e .e** ,O gig ., i. I ....e.' .*e&wW e.... 0 .F%%. Y.S# ...G. ij, W M 6, s - g 4 m W.. .y.e .,u m. W..,.g W.,.w g mw _ V u... m, g NwW w..V. .b .MW.gw.. 4, .P g .I.s ...y,,. i.q, w.w.,,g$.,.,.7.w,.7.,. g./ /. $. J....4.,.w ,s {..., .s. w. .my. ...we..4,. v .s w -..P b...""ww m .. w.e e -j w p ev .e

• 0;.O.e_c.=..:,+

w.,.,.,..* .. j..wwc..._-.....~...n.~~s na . ** * *****s* ,.. +, ..e -,~w.w-v-..~. ~ ^.7 Q n 's * *

• s*b e j

w.. - y .S,*.. ..,. *.$.w..'.'. %.?,. +. .w-. w. -w v..1 3.,, v 4..,;,. .;',./.,.,. *

4. a,

% g.,'"1 A ,,m. ..w.1,,., ..,,J m.. 7 w,.w w.. w w.. ww. .s,w w. ,.~%.r....*.,.s. 9.C *' ry y T.w. w ...>. - I %.. w..

s. 3

....a - w w.s. ww we y. v. r ww .w-w. .w w s p' 3 .j w 4,

• p *. *;,f.

t,*>s.....,. w..'.g . %..s

• C gu, Q,.. g s...,.../

h, .w v-w f v....., ..e 1. . ~.. y [ *M, b., w e. c r.s. 9.t )* ve., 4 u.. w.. ww.aw..p.. , v*

• C,, e- *,.,..

w w.N. .s I'. *,, n... t. L._, . t.:,% e%e v g. ,,. i ,a .e.. -,. .c + /, L.<..s... e. .. e -4. .p Ca o w..m m 4 .e. m,., .p a awc .w A v......,..... - ww,. .s. j .w. a

__.m 46 l' ( 3 ..c +,, c.%.w g,,.. C.*.,",f'*"w". O. j ."...'.4.'..'..*. ..^w'"'~.4~*.f .w' W., m w ja w. j..,.e. .. v j ,,.,...., 1 m.a e, g..,...,...

m. wC wa,.,.e.,..,"."v."OCP. C0".A 4 t101'."s' s

a. w.... 2 vsa. ..w.- ...,,,c,, r a., ,.- w ws v.., s. L.,.Nr.. C.,.

c.. s..

a....., <,. 2..< r n, e c %3, s.& ,L.., t._; On O c - w w. w.. - w,, a w. .ww .i... ..., A,/ v v an,. .:. u.. ,.,s... ..o ,hC C,v,.r',,c, .c,, Cu.,.Jn C s..........w... . O w.. v. w . i. .y.., ,.s..,, 4, g w..v....... a 1...w..s ,, g.4.,s. ' CA W ~"3 2p 1^u D w w O'.'.^w ^ n w

4. " v p-jw. y w..~.

w.. w jv .p v ,1.?

14. 3 s......,,

.s.- .e, ,,. s........ vw .o..,.. -.... v ~. 4.C,.. n 3 e. es.-,, C n+w.4,.1 ..m. w.... .-ws a .g v *. 1. v -w-. .w. i I l .....s; w-w. C.,.,,. C u s,,.&.. .a r -s w ,u , v~w,,9 C..-, <..w. 0 4 - w,cA,>,1*w .,, +

u.,. + a.mJ.n +v.O%.

4 c -v v. ws 'S ..;i, p 2 e... .v m.....,.. y,)e g L... e,., j-. u- . w.w m t c3,,.n.) <. '.,4.v...r ~..,.w. - z .,.,,.m w.on. +c. +w c %., v *,,1v.-. + w.,.m cw.w. i w s l l o s C - c... s...... .r ... v.._w.u..w C... y, vj ->..v, +...:

t. 3

-,s 3 .a Cv,t...y C,,,, AhquaKe OI-v L J,.. t.e..,,,, .y .w .w w... o g/, g7 reo ..w,, s c...,-j...,.2.. ,., ~., ,r. O, c.%..,.n.,, 4,. .,,0,y.,.; p -m. ...ww .. w vjw w. w.,, c, ..,;,. 3. 7.42.., 4.../ - .s...~.... ..v w 3,~- g.. e.., .u q,, e..;., .;.o - SO jw, .a.-....-,,f 4,.,.,s+.j,,,>...w..w v..- w..-.,,,. - -.,.,- t. w. .vw..., ~,.. A. .,. 7 4 a +w ww wew 6y e.J.. * *. V - dt 9* f /-,,* h..,.. .,, _.s. a w 2*,3 h. s. .,,,,.,..mf m y .s.... v,. o.,.. .w.., ...~..,.,. w. ....... a... g,..j.......3..,. j..ww.... .w .w .ws.w i,.. w....,,,ws .w w. we. 4 .' v .,9 ,.,....w n. .., jv.... wv.. s ,. w...wa ,~-..,_,.r jv -. w. .w.s ,.,.,%...\\ y w.. ..g< .?., L *,r w.e e,,,. _. _.... ,., f _e, v.. ,,,.y Q- _. ~. ,y w. .w_, ~. vs v %..g. ...,...;. g................:.,. e..,, ..v. C, ,;,,,,A b, v: 4.y..... ,., e r w w w ._w ...w. ..w-..s w wa.. .. g

• ,,.u w w4 4s v,7 g

e3 a.u.....,.p w-_.aw .. M, e ..A. p,g C9 gw Vga p.m 'w 4,y v.. u.w

• • ww 2.

h W.g

• .v,.,,

u.",..S, ..i g .e ..y g.. .p, .og gg .4 .a p pg q p.g e ww w <w. .s u. p, .4 .,,p gr., g, -os g* ...-e..A.4 k.,.)... a,. .j e w .r..ww,.. =. *.,.... g --..w w w ,.. 3.p 9,. O w.e p., q w.. -t 5 J. 3 .....7. q=,',.2.f,<v. p {. /, O A" w's..'.'","&"'l., v. a w - - + w uw s i I s, w w..w. . w.) , a.,... o. .,,,.m..&., C.,4 ow .m CH u l,. .....,,, O w,. v.,.. v w j w/ ws i .w-w 6* - w w a. .,3 i 1/.,.,... %.,,= .w--. w -.. s. w.. # -.)... .e w......31,, sed a"w *v.. w ..........w v. "o % - o' - ~,,..m. A -. us w .~n'. D v. 1 i i F l - 1 l l l l 'u _ _ -. ~ - -J

(- 1.-i k- _9_ cagnitude scale. For California erthquakes the designers of this scale developed an espirical relationship between cagnitude and maximum intensity so that for any California earthquake of known =agnitude an equivalent maximus intencity can be established. The correlation, ad ittedly "rouch" and relating only to " ordinary ground conditions" 10 set out in the foe cring T.ble (12, pp. 352-3): Richter-Gutenberg Magnitude Intensity Table !!agnitude 2 3 h 5 6 7 8 Maximum intensity 1-11 El V VI-VII VII-VIII IX-X XI i Radius (k.:) 0 15 60 150 220 400 600 Fi6ure 4 au:::.arin the re:calt of a core detailed study of the nagnitude and intenci;y it.;c s2;1icc.sc. cy the Coact and Cecdetic Survey (., ) .,o.s. u,p p o 4_.__ e_,/, _ 0 u a_. e... o.. ,e e y _v. s

.,.,.,e,,_.,,,,..;...->.-

e..~._,_., v. and over. The vide rance of na;;._uu 0; az;ce_:.zad with e.cr. ;rade of intensity is an outstandin; fea:=e, ye; there is a conna:cacy about the correlation ;;ttern h:.0 prov me; i;por: ant inforrt icn on the ca;nitude-intensity relationship can correctly interpreted. Considering the factc of intensity c.ttenuation revealed in Figrue 2 and other cicilar studies, the fact that T.asnituic ragreacn;; the a:Ount of enercy "e.' eas e d at t.h.e .'os*..'L,no.' r - v ' a..'. v _, m'.d... h...".~~v "..."...c-

o. -.. '. 4_.e

^ or sedic.entary character of the b:.ce cat rock in i=cediate epicentral areas controls the observed intensities in those area;, the only ) \\

1 i, j e ( i 3-j l ] 1 1 explanations for the vide ranse of correlation values observed { are those su.;marised briefly in Fi;ce 4. A specific intensity in an epicentral area may be the result of either a deep,.high

nagnitude shock in a granitic basecent area, or a shallow, low cagnitude shock in a sed 1 entary basement area. Between these ex-tremes there could be innumerable co.:binations yielding intermediate results.

Figure 4 shows a remarkable consistency in the correlation between the minicus masnitudes reported for intensities EI-5 through IGI-ll. The other extreme of the correlaticr. _ ;tarc., line a-6, is not so well defined because of the lac'.. of i ;a ca

rong 2,r.ocks.

An analysis of the.. ?arial Vc_.. :; carthquake date can be used to'obtain an additienni point ca line a-b in order to uszaalish more firmly the correlation betuacc. nagnitude and intensity in granitic base.nent are:.s. There aro two :.a;h;i; by which this can be done. In the first method one can, in F.tcure 3, e nply anchor ona end of d the granitic basenent attenuation cra.d. (4-3) on the intensity data 1 1 at 100 niles epicentral distance and beyond and drav a 11:c prallel to other ba:ecent rock graphs for C:.lifornia. At the critical 3-211e epi-central distance (which.narha the limit of increasins intensities) the intensity is 101-7.6. In the second cethod, if the granitic basecent intensity at El Centro (20 -7 2) shown in the accelerogran analysis in Fi;nre 5, is plotted on Figure 3, it reduces to a cranitic bacement rock intensity of 10:-7.S at the 3-nile limit. The technique for this L... ________.___________________________w

F i,,,.: 4 3- .. type of' intensity determination ir, explained in detail in Reference (9).. This provides further justi'ication for correlating the deduced maxic.un panitic basenent intensity of L1-7 8 with the Richter V nagnitude of 7 1. This as indicated in Figure 4 by a circled "X" and the nuneral "1". Along with the data in Ficure 4 relatin; to hich intensity shocks it establishes line a-b as a legitiuate graph for extending the nagnitude-intencity. correlation for ganitic basement areas into the hid.er ranges of nacnitude and intensity. Intensity in epicentral area of the 1906 earthouake. A valid i. r intensity figure for the epicante:1 area of the 1905 earthquake cannot be obtained fron the descriptive caterial available. However, a reliable estinata of the epiec.rual intcasity can ca icvaloped by use of the na;nituda-intensity ccreclation and the use of ::cenent rock intencity attenuation cr ph. Scist.olo;;ical as '.taE as c cic;ical evidar.cc establichas that i the basenent rock in the entira San Francisco 327 area, iraludi 5 adjacent coastal creas, is panitic ::.ther than cadinentary. Havin; i established a correlatica be vean.a;nitnie and cranitic bacanent intensities, it is apparent th:.t if lina a-b in Fi;ure 4 is extended t i i to nagnitude 8.2 -- the well c;;ablished u.agnituic of the 1903 shock -- l I 1 the corresponding intencity will be C-10. This vould be the ninitun i epicentral intensity to c::pect cn granitic rock in a similar shock. i a

r_________ !'c - E (

3-i

'i ' If in Figure 3, intensity IC'-10 is conbined with the limiting opicentral distance of three miles it provides an anchor point for a Eranitic basenent attenuation graph which can be drawn Icrallel to the other graphs in the sc=e figure. This deduced basement rock intensity Graph for the 1906 shock will be very close to the sedimentary basement graph for the 1952 shock which is based on field data the same as the graph for the 1940 shock. Ftrther justification for the 1906 graph is found in the fact that in San Francisco, twenty-two miles away, H. O. Wood (4) found the minimun intensity to be equivalent to a low !:M-7 which fits the deduced basc ent rock attenuation graph at that distance.very well. Using the correlation between magnitude and int.sity developed by Richter-Gutenberg, the establichod magnitude for the 1905 quake (8.2) gives an intensity of MM-ll. E vever, as poinsed out by Richter, (12,

p. 353), such correlation is " rough" and applies to intensities on

" ordinary ground." The intensity to be expected on cranitic basement rock would be approximately one grade of intensity lower cr about MM-10 as shown in Figure k. ~ In summary, all the evidence availabLe from basecer.t rock attenua-tion studies, and from a rather convicing correlation pattern between ragnitude and intensity, points to an epicentral intensity M:!-10 for the 1906 earthquake. l

~. I $ Earthquako intensity and relatcd ~round rotion. The naxinu.2 vibrational acceleration recistered on a ceicuocraph can be used as aroughmea;ureofcarthquateintanuity.! The intensities and accelerations ac;ociate ! vith come of the uore important earthquake notions registered on Coast and Geodetic Survey seiccocraphs, are cet forth in Figure 6. Phile a very cide rance of accelerations is obcained for earthquakes of different intensity and type the cost outstanding feature of such intencity-acceleration Graphs is the fact that fer earthquakes of the came type the acceleration increases l exponentially with recpect to intcncity. For each increase of cne Crade of inten;ity (up to :C:-3), c.a acceleratica is approxt:ately doubled. Eeycnd :G:-S no insure...enscl records are av._lable and the relationship betwce; intencity and acceleration is subject to con-jecture. 4 Unle;; the parti..ent paricis are act fcruh his is technically inadequate. Fortunately, ;'.a ran;c of significant periods is c limited so tant secelerazion can be accepted in a restricted sense as a seasure of intenzi;y. p/ As shown in Ficure 5, cc.e records of utrong ceis;aic ground vibration can be dividad into foar typec: (1) a close-up shoch vave type of very chcr: dur; tion -- perhaps only a few reconds; (2) a ;ype of danagin; earthguske notion cost frequently regic;er-ed on atron; notica ;cincogr;phc and concidered best adapted to engineerin; studies; (3) a ;ype reprecentin; the avera;e ac-celerationc Obtained fcr the various crades of inten ity, and finally, (4) a t;<pe of clon;ated record obtained in the narcinn1 areas of stron; shocxs. The check-wave type cisht best be con-cidered c special cace to be given consideration only after the more proba'olo types of dana;ing earthquake =otions have been ctadied. t

M,' J. %)- ~ / -x-j)(, ,~ . I. (. (- f 1 t ( / 'o 9 4 .O 1 4 4 ,,., ' 4 ,N a / - 14 a

If the intensity-acceleration relationship established by line B in Fihre 6 is extended beyond !O!-oiit. becos.6,s pparentathat'the ac-

,t y y 7 ) 3,) t r ce2 ration would reach 4 or 5g in an D:-12 drthquake 9' Notning in / \\ seismological literature vould support such a concluddp( tithough t 4 evidence seems,to be videly accepted that acce teratf one exceeaang ./)(- 1.0g have been noted by reliable observers, especially in the case \\. ( of th'e grens Assas earthquake of 1897 In view of hhe apparent / validity of such evidenec it vould be reaconable t27cfnclude that i 4 s 'g,.' ig seismic accelerations of relatively high frequency ! an :*each values somewhat in execca of 1.0;;. Accelerations substant play greater than 1.0g are not supported in seismological history. Ad ordingly, the j ? extrapolated portion cr the ;c?h _a }6ca 6 has been :.odified from -h t (a) to (b) which represent 0 e changa in the cc:.non ratio of the \\ geonetric progreccion from 2.0 to 1.0, to 1 5 to 1.0. '2he. renulting V acceleration for an 10:-12 shock 1 enout 1 52 Th!.;.ould nahe the acceleration fo'f 20:-10 abou; 0.6;.. 3 accuse of the ur. certainties 1 involved in such an extrapolation, the writer feels that 0.67g voulu be a' reasonable working value. 1 The duration of a disturic.nce play; an iuportant role 'in governing intensity eva:. ;tions. Fit,;2re 7 Eives a co.:prehens.ye 1 picture of the periods and c plituden of the ;;roun :otior4 ren.ced l to the various Erdd es of inten ity. Figure 6 cho;r, fcr instance, l the ctccinum acceleration to expect fer 10!-6 in a shock-vme cype 1 l I l l l i t. i l l l i h

(Th i 9 3 'r g e-t.) 1 -{c ,y ( k I-;t }. h Q, ') ~ ~ t 4 q }; g z 0-1 .t . 4 y of earthquake; F16ure 7 shovs the range of periods that micht be associated with such an acceleration under varying circumstances such 1-aus fgcal depth and local geological conditions. l ithe diagonal coordinates in Figure 7 establish the corresponding

4 vibrational velocities and displacements associated with any combina-a b,.

tion of accelerations and periods. Because the velocity function G 'i serves as a rough yardstick for reasuring relative accelerations and at the same time serves as a raeasure of tue potential enercy of '[ earthquake waves o.O all frequencies it is fundamentally a more realistic \\ measure of earthquake intensity than acceleration. A simpler picture t of the ped.ods and amplitudes involved in a damaging earthquake motion 1 1s obtained by referring to t.n period-s.splitude cryh cf the El Centro ground cotion which is also sho.en in Fi p e 7 As prac;ically the entire Gamut of expectable earthquake periods was registered at El Centro this graph serves as an envelopa to cover a vido variety of records of engineering inte.est uany of which include only a limited range of periods. [ Estimates of g.aximus ground uctions to expect from a 1906 type ..? earthquake in the Bodega Head area. Not kncving what ground periods vould be dominant in such a shock the logical procedure vould be to assume an El Centro type of motion. In an earthquake of K'-10 with a maximum acceleration of.67c the amplitudes (acceleration, velocity and displacement) indicated in the El Centro craph (Figure 7) would be ,approximately doubled. This is considered a minicum estimate. n ________t

i 1 i ( 1 i 41 In a shock vave type of disturbance of intensity K4-lo, which j vould result in higher accelerations than normally associated with l 1 earthquakes of that intensity, a maximum acceleration of 1.0g might l be expected. In this instance the El Centro amplitudes shown in Figure 7 would be approximately tripled but the period distribution pattern would, no doubt, be considerably changed. This is considered to be a maximum estimate of expectable ground motions that might recult from an earthquake of M4-10 intensity. It should be pointed out, however, that there is no ceicaological record of shock wave type earthquakes greater than intensity R4-6 having occurred in California. Sin 11arly, while there can be no Guarantee that an earthquake greater than the 1906 shoch vill not occur in the Bodega Head crea, the history of car;hquakes in active seic=1c areas leads one to believe that this 10 not likaly. The pattern of activity in the various seicnic creas of the world tends to remain the ::.ne over long pericis of time, perhaps many centuries, before the pattern chan;es. It is renconable to expect that the same order of stresses vill be developed and ulth::ately relieved by the came tyre of earthquake techanism accompanied by the sate order of eart' quake energy releace. Accordingly, ground cotions up a to 1.0c vaile possible are not considered likely. 1 Conclusions. From the foregoing, it can be concluded that Eodega Head is not likely to be affected by an earthquake of greater l l l e

( , magnitude than the California earthquake of 1906. If the epicenter of such an earthquake were located within a few miles of Bodega Head, the intensity on the cranitic rock at Bodega Head vould be about 104-10 and the associated ground notions would be approximately l l 0.67g. If, because of its faulted and jointed nature, the rock at Bodega Head does not respond with minicus basement rock intensities, an intensity of 17.-10 could result from an earthquake centered considerably further away from Bodega Head. While a shock wave type earthquake equivalent in magnitude to the 1906 carthquake, or an earthquake of slightly greater l magnitude than the 1906 earthquake are not considered likely, the l possibility that such earthquakes niet occur cannot be completely discounted. In such an event the ground notions on basement rock. at Bodega Head nicht reach about 1.0g.

F h2 l A ( TABLE I l l L ' STRONGER SHOCKS IN CALIFORNIA ORIGHTATING ON OR NEAR THE SAN ANDREAS FAULT Maximum Year Late County 101 Intensity (2) Magnitude 1800 Oct. San Benito Very large 1838 June San Mateo x Outstanding 1852 Dec. 17 San Luis Obispo VII-VIII 1857 Jan. 9 Ventura X-XI Outstanding 1865 Oct. 8 Santa Cru VIII-LX Very large 1868 May Riverside Very large 1885-Apr. 11 Monterey VII-VIII 1890 Apr. 24 Monterey VII Very large 1893 Apr. 14 Los Angeles VIII-IX 1898 Apr. 14 Mendocino VIII-IX 75/ 1901 Mar. 2 Monterey VII-VIII 1901 Oct. 28 (4) VIII 6/ 1906 Apr. 18 Marin(5) XI 83 1906 Apr. 18 Imperial VIII 6/ 1907 Sept. San Bernardino VII 6 1915 June 23 Inperial (2) VIII 6-1/4 1916 Oct. 23 Kern VII 6 1918 July 15 (4) VI 6-1/2 1922 Jan. 31 (4) VI 76 (continued)

f .3 TABLE I (continued) 1922 Mar. 10 San Luis Obispo IX 6-1/2 1923 Jan. 22 (4) VII-VIII 73 1930 Feb. 25 Imperial VIII (Less than 6) 1930 Mar. 1 Icperial VIII (less than 6) 1932 June 6 (4) VIII 6.4 1934 June 7 Monterey VIII 6.0 1940 May 18 I=perini X 71 1941 Feb. 9 (4) VI 6.6 1941 May 13 (4) V 6.0 1941 Oct. 3 (4) VI-VII 6.4 1945 May 19 (4) V 6.2 1948 Dec. 4 Riverside VII 65 19k9 Mar. 9 San Benito VII 1950 July 29 Imperial VIII (lesc than 6) 1951~ oct. 7 (4) VII 6.0 1956 oct. 11 (4) V 6 l 1957 !cu. 22 San Mateo VII 53 (1) Shocks S.E. of the San Bernardino Mountains and into Imperial County are considered as being in the San Andreas Fault system. (2) Modified Mercalli Scale of 1931. (3) Data largely from C. F. Richter's " Elementary Seismology", 1958. (4) Offshore chocks apparent by originating on the Northwestern extension of the San Andrea Fault. (5) Epicenter of main shock -- foreshock occurred off Golden Gate 30 seconds caritcr. I 1 l

s. l y, 1 APPEIIDIX I 1. Earthquake History of the United States - Part II, Stronger Earthquakes of California and Western Nevada. .U. S. Coast and Geodetic Survey Pub-I lication No. 41-1, Revised (1950) edition. l 2. Crustal Strain and Fault Movement Investigation - Progress Report, Bull. No.116-1, The Resources Agency of California, Department of Water Re- ) l sources. 1 3 Horisontal Movement in the Earth's Crust, by C. A. Phitten (U. S. Coast and Geodetic Survey), Journal of Geophysical Research, Vol. 65, No. 9, j September, 1960. 4. California Earthcinahe of April 18, 1906, Report of the State Earthquake Investigation Commission, in 2 Vols, and Atlas, Carnegie Institution of Washington, 1908. 5 Abstracts of Earthquake Reports for the Pacific Coast and Western Mountain Region. Quarterly Reports of the U. S. Coast and Geodetic Survey. 6. United States Earthquakes,19-. Anr.ual seismological reports of the U. S. Coast and Geodetic Survey. 7 Earthquake Invest 1 cations in California, 1934-1935 Special Publication 201, U. S. Coast and Geodetic Survey. 8. The Modified Mercalli Earthquake Intensity Scale of 1931. By H. O. Wood and F. Neu= ann. Bulletin Seismological Society of America, Vol. 21,

p. 277-283 i

9 Earthquake Intensity and Related Cround Motion. By F. Neumann. Univ. of Washington Press,1954.

10. Analysis of Earthquake Intensity Distribution Maps. By F. Neumann.

Publications du Bureau Central, Seismologique International, Series A, Travaux Scientifiques, Facicule 20, p. 213-222.

11. Synposium on Microseisms. National Academy of Sciences, National Research Council, Publ. No. 306.

12. Elementary Seismology.

By C. F. Richter. W. H. Free =an and Co., San Fran-cisco, 1958. 13 Earthquakes and Rock Creep. By Hugo Beniaff, Bull. Seis. Soc. A=er. Vol. 41, pp. 31-62. L -- -}}