ML19317H022

Forwards Coast & Geodetic Survey Rept on Seismicity of Sacramento County,Ca & Vicinity Per in Util Psar. Recommends Use of 0.25 Gravity Acceleration Value.Supporting Info Enclosed

ML19317H022
Person / Time
Site:	Rancho Seco
Issue date:	07/05/1968
From:	Tison J COMMERCE, DEPT. OF
To:	Price H US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML19317H023	List: ML19317H022 ML19317H029
References
NUDOCS 8004030705
Download: ML19317H022 (24)

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Su rf ace 1971. June H. 5:uttern Californi a.,ecruary 1s : staged in :ne r

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a*e cesacey tote N. ara s*,et. Aco-taat. Seve-e s

<<a* cs ses iss.gv men us,gsa 35ect.

51414

!stro*ents 3.s.nt Crheo 't'.s -C street seve-r eset Cessesmeat of ceasemedea. Wo** 8-n ess.- g

/*o** *se s* s.s~<orar Mrss w aees s$ sis (P* ode 94 ws7ist r

Co* tv tr~r S4'esswea. istemp toeg. Es Isseer.

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2.s,.r,.seus uat cr o e 4+isi.:4:t es sw 7,-i.ae n

C0JOA 31 !Il II3 - 1$4 (TS78) aest 'sitheiw-e 31/Nw mt S r

IN THIS ISSUE I74 O7EN FILE AEPORT 174 7A0;AiC HC7 5PCTS 175.

7COTNLLS FAULT SYSTEM.

177 CRUSTAL MOVEVE.'ei CN THE FCCTH"LS FAULT SYSTEM NEA!4 AUBURN 123 SE!SM.0iTY CF THE FCCTHILLS FAULT SYSTEM EET'.*.'EEN FCLSOM AND CROV.LE.

13.5 FOSS'LS tee OVING PAST.

-15 5 THE UNIVERSE MAY BE 20 E!L CN YEARS CLD t ::ve'. !s:seismal ma: for :he ma;m:vce 5.5 ear:m;ua'se mat Occurred en June ::.12M in the northern S;erra Nevact. Tne r'emars Y.

Interuhy nume ais indica:e me Medified Mer:am inta-si:>es wi:nin eacn : t e. C en cir:!as re: resent *: cations of re cried inteesi:

va!ues are snown, and me ::vare re:resen:s :ne e:i: enter. This 1909 eartacuake :c:;rred wi:nin :ne F:ctnuts fau;t system. Current

e

i:; cat anc seismo!:;;calinves:i;aticas were Htia:ec :o determies me ;:: tent:al er ex. sten:e of fau:t ac:Mey n and at:und the U.S.

Evesa of Ae:!amatioWs Auburn dam =reje:: en t'e N:rth Fers of :ne American Aiver. -~hese s:u:!es indicate :na: me F:cthills fault system is a::Ne; see articles in this 'ssue te;ints; :n :. 175.177. and 131 Cs:J cc-;Esd amt esp eswa & Tccrren B. Tem sd.r.

Ca!f:mia Covision of.%nes and Ga:Icpy. and Cavid L. Pode and Gary T. Estes, stu:a-A Universityof Cah!ctnia. :avia f.

1 OFR 73-5 SAC: PRELIMINARY ?JE-K 1!y Hot Spring. !:cu:d near the

~

CDMG SU:.TS OF A GRAVITY SURVEY IN town cf Canby, Medca: Cour::y.

.a l

THE KELLY HOT SPRING AFJi.A.,

nenh:ss:: n C21!fcrnis.=2y represen: a OP5N FILE MccoC COUNTY. CALIFORNIA.

sig.inezat Iow-te: penture geetherm.21 By R. H. Chs; man. G. W. Chase. and G.

scur::. A re::nnais:.2n::; 2vity s -. y g

C. Tay! :, May. 1978.12 p., I tab! 1

ondu:::d in this 2 :2 by the C2!!ferrds RgPO RT cra. 3 ; : -s (s=1-1c00).

Di<iecn er Mine: 2ndociogy has7.

vested 212:3-fault-bou:d:d buin or pes-l sible caldera cent:::d s few :ra=s nordwet cf the het s; ing. Sm21:=r ;:av.

- PACli:lC HOT SPOTS ity 2no=2 ties sugg=t 2: ;;=::.-ce er ei-ther intrusive masses or minor hersts 2=d Evid:ns:;sthered dudng Leg $5 :f 6:

g 2 bens within the maje 2nem21y. One Inte.-.2:icn21 Deep S:2 Ddning ?:: ject in such h:nt or intrasive is e::sety as3cci2:.

,/>

,,.3 th: N:nh ?::!nc appears to ::nn:= de ed *id K:Ily H:: S;dng.7::-- 2! fluids b,,,,,

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m hn.. es: bc2 de Em;<r:: S _2m:u.t

.ight be assceist:d wid 6: basins th:

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m:enn; cf $ A: :d::n G::;hysi:2.1 the Sa::2m:nte. 5:.n F-ze:!see. 2nd Les s

Uni:n in Apdf 1973 by USGS s:!:ntis:s Ange::s Dis:d:: :Sc. T..: : pct-

.2y E n :*:,*2:is.:n sad G. St:.: C21rjm;;:. #A

$ ;ur:h2 sed at de S2:n=:nto Dis:ri::

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!DAs *w1NT CF CON 5!2V A780N C A*.J 0 as:A esvisics or

.. IN ES AND GECLOG'/

P. O. Box 2Ho S AC M AM ENTO. C ALIFORNI A, 75312 I

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4 AND THE AUBURN DAM

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.[^,yQh Calf:rnia Dm,. E8NN577. Ge:r,hys:cist JOMN H sica cf M:nes and Ce:Icgy M,3 1..- W.:., s.+ M' ".~"2-u. M.v. W; J4 9

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Price :o the Orovi !e canhq.ake cf Au-Thus, the Oreville canhquake previded y.::;;

e W'z D :: h h:'C.v.*. D @gejg ii--f' ::@ -

gust 1,1973 (M 3.7, Berkeley) ee Foot.

the isnpetus for a re-: vales:icn of seismi:

hills fault sys:cm was 3:.en y regarded ha:ards in the westem Sierra Nevada.

I::t

s ts seismi: ally ina :ive.The U.S. Bureau ci The prepcsed Aubum dam.because ofits Autum cs-f:uncation excava:icn. fcek-Ree!a:.2:icn (USBR) Aubum 4:m site thm-ar:h desap andlarge s!:e.its!ocatien ing a:rcss american Eer:anyon. f t.a let:

!!es '.W. thin the nenhem ett:nsica cf the wi:hin en: cf the two prir::ipal branches atu: ment es:ava:icn :an be seen in the Bear Moun: sin fault :ene. 2 major seg-cf the Focthil;s fault system and resul:ing

en:er ba:yreund. A sc.:en of :.'e rish:

ment :( the Foothi!!s fault sys:: n, A!.

potential ha:ard to the Sa:nmento acu:. ent een te seen in :he foregrcund.

Facto a C.E. Escon.

though USBR had found a r:markably me t:pciitan ares.has been sipifican:!y r

low icvrl of seismicity and a correspond.

affected by this re-evalaution.

ing h!;h level of crus:al s: ability in the

5. )

res. :h e cc:urrene: cf:he Creville earth.

GeCLOGY

\\

zusie r: suited in new ::ne:rn for 2:tivity AUBURN DAM Ee9 Cnal GeCIC9y I

alcn g the Foothills f: ult sys::m. and in

1r-i

uiar, the ac:ivity of fau!:s near and The propcstd Aubum dam and r:ser-within th: Aubum dam site. The geologi:

veit at: located en :he Nenh Fork of the ace reg:enal geciegy of the ner:hern and :e ::ni: similari:y b::we:s de Oro-Ame:i:an River at Auburn. 50 kilerne::rs 5:cfra Nev:dz foothiUs is summarized !=

vi le and Aucum areas and the pessibi:ity (30 mi!:5) nenhe.s: and upstream fr:m a USBR re;cn (1977):

da: de Orevil!c etrthquake may have Sa:ramento. The dam, as planne is a d

been indu:ed by the fi!Iing cf orovi!! res-thin, doubic eurvature cen::::: arch with

".Aubum damsite is e n:rs:!y !:ested

vcir a few years tar:ier in:re2 sed con.

a height cf 2:3 :..:ers (m) (7 0 fer:) and in a nenbacs:-trending s:::p!y di;;ing

m for pcssiblc indu:ed seismicity at a crest I:ng:h of t:65 m(4130 fee:). Au-b<lt of meumerphi: reeks en the west Aubum.

bum dam would b4 the third highest dam side of :he Sier a Nevada foc: hills. This cens:ruered by USBR, ex:: ded only by - b:!t consis:s of !st: ?a!:e:ci: to mid-To ::=sess th=.e cene:=s the USBR Hoover dam at a he! 5.t cf 221 m (7:6 Mese::ic =c: merphosed volcanic and 3

r : air::d de f".rm cf %*cedward-C:yde feet) and Glen Canyen dam at a height of sedim:nury rocks whi:h have been in.

Cansat: ants in May 1976 and also ap.

• !6 m (710 fe::) on the C:lerado P.iver.

caded by ultabasic and hsic rocks of pin:d a :eite: view beard :('tading De Autum r:5 rvcir would have a timitir ap Jurassi: to Cr::acecus gn.

s:<:iatsu *.: esaius:: 'em :h: ::nsult.

ca;2:i:y :(:.3CCcXO act:-::::. The Cro-n!:i: ;iu:: s !a:: intr;dd de en:!r: s:-

arts s:;di:s :.-d :n

!=!,. er Auburn v:::: resen::::a;a:in is 3.411.XC 2:re-

::.~~ ::c: re meur: ;hi:s:;;e ::

Iam. 02.9 inin:Snsi*e :ne-;.:ar s: dy fe:: and Shas:a Lak: ::;a:i:y is abeu:

is ::m;;e.t:y fa;;ted and ::.::.!!y f::d:d.

3 h d-std ~.yde

nde:::d 4:: ailed 4.!"0.CCC 2:n-f::t.

but in gents:1 ;.:unpr ro:ks,:o :he e.c::

fr.!: ! s=:1p:::ns in de w:::::= Siern si J. map: d spinst : d r rxks :: :he ess:. The s::: n ex:en: :( d: Fo::h:.:s i

es a da f:.:2.:Is. eta..!r.:d b.eirxk : 12 W@i, g:@My$'r..g

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amat.:: b:!: is unin:*n. but.: !:

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j

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: ::-:inue ud: 6: C n:::::

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• y. th::: an:!:nt 'n.?: ::nes v.:::

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.c. m r.:.Y j:r fauh de 'Meienes fach :ene' and th:

in the foundation. Mes: significant cf 9 'D5f-4 T M' W. j.s.A..':

-r

• :s:er-=:s: maj:t fault the '3:2r Moun-thse is 2 premin:n fau's syst:m di;;ing

..M ffG-N

73..@., * /, '; '- /I. E-M tain f22. ::ce.'J'Lis compiez f: ult sys.

downstr:2:n from 15 :o 50 depas. Tnese E

tem ex:=ds se=c 3C0 kiic=et:rs (190 fau!:s dip cut of 6: !:ft abu: ment in 2 rnites) ficm near Madpcs2 on the south downstream dir:::ica and into the dght 8'hMG".-idy,~ h h]c.

' to the vicinhy cf Lak: Almance en the abutment. ncr: 2re s!so numercus join:s d?.Z.Q.%i.,

2 T -

=

y; : 1

"'g: gr %

1. @@J; 3'p?.% D. 4.,::M. -dy snd miner shears within the fcundation n:rd.

@@'M jg[yff ff-f# y$g,Q 2nd joint atdtud:s vary frem few up.

J-i.

t:

~/d s:ru:n to !cw downstres.ne joints 2nd W#d,k.Sj,:/Fe[jCg pf 4 F0:.:nca:!cn Gec!cgy fault ::n=s at: parily bes'ed wid quart:

and ca!:!te sad locally both are intruded E'll' ?,. ::

$ d /py Re::gnizin; the g:cie;ied!y ce=pi:

_m:-M:s.y'.fg:,~g* W 2

found: don' = idid:ns 2.d censid:dng by fine-pained disbue dik=s."

}

' "2:..

2: :y;< 2nd su:: Of 6: pre;csed d2m.

(- v :..

f2.

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,~

[. g'- - 4 : @ Q:. [.t:

r hg$:~-3 USSR ccndue:M 2 very ex:ensive de.

h:

REGIONA!. SEISM 1 CITY

.,Q_

tai ed ;r:Ic. : =2;;ing exploratien. and g.

y d

gQQ":.7.-

.:: sting ;r:p2m in de foundatica area.

De Woods ~.rd-C yd: study iden:!5ed

_. - -"::q f(. h L Th

'.Q.,,,

h 'r.:; E.2, ?

-f. D D: f:U wingis asumma:7 cf the geclogy s.~<'h

[li,P @. @ M,.w:

at 2: Aubum ds= site (USBR.1977a):

bcth ac:iv: 2nd inzetiv: fauhs in the *es:-

gh,:c 4',n em Sier-2 Nevada. US3R criteden for an

~::db,::',c. h.-

-e.:5.:. N -^M:Y'UN-

"De fcundaden reci is chiefly 2=.

"2:dve" fauh is dis;12:4=est sithin de phibeli:: wid =incr =eusedi=ents, both past ICO,CCO years. At de Auburn dam cf which are compe:c: f undadon r:>:ks site. de absence of sui:2ble d. stable de.

he f@,.! abuttnent exc2vatico IOr the Au-6 recluded a xsidve usessment cf

, urn.2m. er:cro,y P.Y. n.mimoro.

f:r ts A.ubum Dam. Hewever, these xs.its r

..r r

rxks 2r: :nter,.2yerd w. h ccns.derz..y 2:avity or ina::vity, i:

t oi w:22: ::nes c:=pesed of talc, schis:.

chieri:: s:his:. 2nd cc:2sien21:y :2!cese On de basis ef a nu=ber ef jud; c.ent2.1 ne 5:. ate of Calif:rnis. through 6e ser;en:!ne. Dec '.d: unes' st: partly f2::crs. !ndudi::g similad:y of bedrock De;2n=ent of Wat:r R=scur:es :nd de cht:2:::risd:s ef!2:e C:::c=Ic and 2::ive Disisien :(Mines and Geology has b.een sh:2. d. ;2r2:1:1 the fciistion cf de 2:1-

hib.

lite. and tr=d in 2.n upstream-.

faults Iser.here in de foodi:!s, Woed-an 2::ise par:Ici;2nt in the ficid inves:igs-tiens and $c :: view proc =ses 'n e De \\

dew.s: rum directien. dipping s:ceply c t ward-C:yde condudd dat de prchab!I.

cf the d;.ht abu=nent 2nd into de ! eft ity cf 2::ive fauhs in 6: dam foundaden par:=ent of W ater R:, cure:s h.as cenven:d its !cng-s:2nding Consuhing rang:d fr== 1 in 10 :o ! in 100. At least Scard far ~:.2rthqcake Ans!ysis to con.

thu:= ent.

six fauhs c!r.ssind as "2:dv e" and " !nd e.

"Str;entint x=rs :.s an irregu!st mass te. nins: [:::ive]" ser:identiftd widin dnuously:: view de; reg ess of theinves-32k=t(20 mil:s)cf de dt.m site;de :!:sest dg :!cas at Aubum and ;revid: 2dded

=:d:2:dy above the lef: abu: ment 2nd cf d== !s wisin C.3 i_ t (0.5 mile) of:he depd :c de Sta::'s t::hnicalinput.

Iccdly in c6e ;ct-icas of de founds.

ic... ~' e s:rpe::ine ber: is s eem;<:ent site. 3: =2pi::de cf :he Maxi =u=2

>:k but is usua'.'y bcrderd by sheared Cr:dible E2: nquake dat might Occur 3: 2::ide ths: Jci!:ws det.:ribes $:

2!: 2nd ch!:dt: schisu. Midway up the 2!:ng 2ny ne of cse fachs was :en-r=ulu cf gecd:d: leveling recent:y ce=.

H;b.: abu:==t 6::: is a :ene of

!uded to be 2 =2gni:ude f-5.5 carth-p ::d to fucher as:=s the 2::ivi:y cf $

Fced !s fauh sys := in de vicini:y cf

- ::2wdi= cts 91 m (300 fe::) die'.

quake. 9/oedward-C:yde cendeded da:

In::dayerd widin thes: =e:2 sediments if the Crosi;te n.hquake was assumed Auburn.nis work suppi ments an est.

are num: rocs *.21: :en=s vs: yin; in dick.

net to be reserveir induced. de !!ieli-lier CDMG s:udy of ge3de:ic leveling ness from about 12 mi!!imeters to 11 m hcod ef s:indu:d unhquake equalto or and seismicity of de nenhern Si=:

2.

greater dan de Orevil:e cardquale is Nevada re;cr ed in de Mse:h 1977 issu.=

( in:h :o 35 f:::).

2% to 5'i. However, if de Crevi!!c of CALIFORNIA GEOLOGY.

e2nhquait was re: scir indue:d. de e.

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ON THE FOOTHILLS FAULT S

STEM NEAR

AUBURN, CAllFOR IIA

.Sy JCHN H. SENNETT'. Gac:hys::Ist Cai.fernia Civisica of.'.tir.es and Oe:'c;y W 6 % M.. <M. W., n~ @.._ M *~A,x G V. ~Y.. W. W I 1ni.=.;Oucn. c n v -4_,. m,

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A:s:ur::s Censulting 3:ard for 3. sed-

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q de Fecdi2s fau'.: sys::=: (i) :h: ncr:h-

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c= enension cf 6e 3:1r Mountain fault g+.o.-:J*v"'C 'I"T Qg

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S;de 1.:ctr'; c :ar (51.9 it age of a ;:: tien Of :. e fk::-ctder re evenn; reute..c !sem a

e FI : -ctder r:':vd!..g a: ess de Bear Man.$i.. s:- :n: (Lecmis to Weimar)

Lake is a: 5 :: enlef t of ;nc::: see figart i fc da:2;:s. /hcre by Wes6rthe:as /.;r /sr.iS

^

3 633 3~# O '^r M w:.s ccm; e::d duri::g Nov:mber-De.

.::>ec 1977 ~;udng d.is sam: period.

%:-crder rd:s e!ing v2s also ::=;le::d nal 1912 survey) has hen : m;iled in tht: Iics between h: two ;dn:';2l

!::g : :8: existing SGS level :ine Agure 2. T..is 75 kilome:er (km).- ess-branch:s cf the.Toodias fa:!t sys::=. E.:.

s nd::.s :T A. bum. 5::4::n C:ol and se::icn en:nds frern within de Re:k!!:

ce;: for an indics !cn of some s'.!;h:

Co:::12. to pr:wid: ds:2 :encernin3 cnc plu:en en 6: ficer ef th 52:r2=:n:o V2!-

m:s:=:st ec:ur-ing n=2r the w:s::::

et 2: prin:i;al lin:2m:nu of the Dezr ley, at an :!evation Of abce: ICO==:ers mir;in cf dis int:-fault udt, there is no Meuntain faul: :ene is :ranse::s the (m). a:::ss :he northem c.itensi n cf $:

ind::stion of any sig.in=n: reinnv: d...

Aubu: : d:= rte 2 :2. Cder ecmmit.

Bear M ecn:2in faul::ene. seress an in :r-vni : :hange c cur-ing 4it'.in this =nti e me::s for the :r.fing :::ws and the enset veni'.g t<'t cf Jurassi: me:2mer; hie :acks uni: during the. 0.y=

peri:4. Im-Of -inar w=2er pre:!uded r:i:veling and 2:rces :he M:lenes faul::en :o E=i-1973, ever which de:: suntys have been 1:m.: de MC:::s fault :ene.

grsn: Gap at an devstien of about 15CO cor.due:ed. 20r Sis r:ssen, bench =s-k

m. T::.:. hem :x::nsion of 2: 3:::

X!H ne.2 Weimar w2s sde::-d e.nd *:Ed M::::2in f:u': ::ne, wh: : :::is:d by in.: :.t in elevni:n s.s 2 5:. sis f:r.cm.

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s G:s fault sys:e n be: ween tocan a-c Emigrsn: Cas. P:acer County. California.

F ;ure 1 C:m:arative e eva:;:ns a : ss ?e ~ :::

9,-

branch =s cf the Foc:hiiIs faul sys::.m; (2)'

and c hers (1977). :he hineri: 1:ve:ing s:ru:tur: tha: wu rese:ivsted in :ste Ter.

he sens: ef directica of lis movement is

rly indi:.ucs v:r.:::1 d:f =2:!cn.

iary er Quat:: ny tirn:. Displa:: ment not :ensistent cver ti==. These eks:

2-Signi5:2ntly. :he sense of dire :Ica :(

en the fault is =s im2:ed to t< 50 m. bas:d that this ser:i:21 defer:.2-

12:S: me.:m:nt u :his 'ces:ica hu net en a down-to-the-:25: 3::p in the ?!!c-

!:ns sugges:

te:n ::nsistent:heween :ht 1947 2nd t.::

cene mudCows that esp Giant Gap

icn. which rnus := ult from sir:ss. s er Ridge. A line2 ment :ene : hat enends tec:eni cripn. is being pressed 2.s til -

o th: :2st, wh::: s' dudng :he ;<dod northward fr:m the topcp2;hi s::p is ing of major s:cactursi uni:s about s.::=s j

1969 sun:ys. rttative m:vem::t wu up that se: c!csely assoc.1:ed if not ceices-J' 3

tetw een th: pre:: ding suneys.1933-mad: up :( Giant Gap Gulch and :wo dent with, r::c;ni:rd pr: f'ene: i: faul:-

194, ::uise =0.ement was dewn :: the

!!near s:: 2m segments.1"h:5:, in turn.

l

.u:. A few illeme:rs fur.her eut, n=1r proje:: :: ward a cut siong :he Southem ing.

Ah 2nd Cua Lems. 2:::ss the Meienes

? :iCc railtcad jus: wes: ef Ct.s2 Lema.

..C~" ' M1,.g.;-l2.C[^, v r

:: : u ds*n2::d by Sem::: 2nd d.::: 2 ::ne ef d:wn-:>-the w:st fsult-

.X i W.

.d-..

2:: Mi.

-n.. ;s :p. :v 3:::: :f ::n:: i.;

ir;

• u :ts:n-d. The faut:s dis;

- :::' d:':

, s :. n ::: 2;;2r

e d:;oits and in :.:::::n;

- T f ' L'l.C

2 "

~~ is ::::.n;:n ; :- ::ed Os..:':ms

1.num be!! >ed :: he ?!:in:.:::: n 2: :sen :f M:. s 2 - u gy (C'MG) 2;: Apin :: this 2,=:!:n :he :9 6 n

'.= nis

'.'! sir-'a r te>u!:d :h:t he ::. se :f --:ve.

:n:.: : :.t"n; ;: ::: : : f2u.::: :

rer,,n ef

. :::.:.:. In f ane :

6. The :s.hs m:n: had : :. sed; dudn3 :h: ;-:r:,d 2 :!nis e :':va:!:n chst ;= Indic ::d :

nO' 2 n : F - 0 0.'.f 0 s... :. ;C; a: T

• ? -!:59 :h: resu.un: re:s:ive s:-

' : *:d:us sun tys 1:rm th: ? : r.' :-

~

.:: :-.n.:n in :.:s: us:.rs-m:n: -u up *: "h: u.5:. J:tus f: 'h:

n:nsI:n ci:h: E=: Maun:.:n.'.. : :: -

t: :.:-:i. !:: b:dy tes::n

d

-d :?s?-:7~s. the re::.htn: *::nb :

near Autum su;3:s: si=ihr nr.i:2' a

:: :n w u d: *. :: :h: ess:.

f:=s:i:n in the f:~n :f 2;;1r:.:

.3 A :: :n d ".r.s.

--2 :.' ~ ;ur: D. A isu.: 2:

<- 2 '::n::

-:.s dei;-ned 6: "Oia.:

~~.es: 05s:-v2:!:as 'est :o :wo c:n:! -

oc:urdn3 z'en;;his ws::= bisn:h :f. -

C:;f:.a : M: and ::rers (1477) 2.-d d-3:.-bed 2.s f::::*s:

the Gis.: G2; s::ns: (:) sign:n::n: s :r.i:.21 :r.s::1 4:-

FO:::i.:s f.suh sy s:=. H: : ::c. h: :-

f:=2:!:n is.::;rdng 2 Sng :h: eut:::y

2

ent :xes of T.:xure st: :::-::y :.s.s:.:u.

7

~..: r:;te:ns a pre-Cen::::: 5:dre.:i e

.e

.y e

T

ed wi:h re:egni:ed pre-Cenozoic f:ults pressica of cr:s:21 s:rsin. Indi: sting de.

S:uth:m Pacific r:ilt:sd in the immedL w hi:h bound or !!: within this bre:d fault f:rmatien of the relatively wc:k reek 2::;r:ximity (< 200m) cf the USIi?.

units which ::= prise this msjer fault d:signated f:ults "F-1" and "F-O" w h!:1

ne-

ene.The:2usative s:r:sses st: legi: ally trans::: the dam f: cad:tien area. Tais De mest sig.!Geant differential eleva.

trac:abi: to the same tec:enic crigin as 1x2tien is abcut midwsy within the ::.:

tien change cbserved betseen the car!!:r these stresses which are prode:ing sirni!st cf major linearnents (De: =sn. M:.!du, surv:ys cf 1947 and 1969 is a " trough" of deforms:!ca slen; th: :sstem (Meien:s)

nd Salt Creek) :hst trend :hrough :i:

depressed e!cva:icns : entered about the branch of'the Foc hills fault system.

reject ares and the

ity of Auburn. T::.

westerly bound cf the :rcegh, te: wee-city of Auburn (5gure' 2). This nut.-

symm: trial tt: ugh coincid:s r==2rkably ne eas:em margin of this treugh ap.

Aubem and N:w:s.st!. 3; pears to b,e de-w:!! with the ex:ent ef the belt of fetisted proximates :he fault cen:se: th:: se;2 Sned by, er at !:2s::!:sely re!sted ::. :i:

2r

ent::: with the RocMin ;!uten. T is m::svel:2nic. recks which c:nstitut:s :he

. rates the me:avelcani: rccis of the 3:

M:untain fault ::nc frer: the ::!a:isely 2ncm2fy is deSned by an e!:v: tion chs..g e n rtherly ext:.sion of the 3::: Meun:2:n (su!: rete.

stable Jurassic reeks :h2: tie b4:s::n the be:wmn the 1947 and 1969 surveys :/-

two branches of th: F cthi!!s fau!: sys-about.30 mm over s h:ri:ent:! dis:2.:: ::

If :his mov em:nt ;a: tem w ere chse.wed tem. This fault cen:s:t cresses the level abou: 5 km-an 2meunt severzi ti ne.-

in an a!!uvial at:2. the elevatien difTer-line jus: west of Bowmsn, trending to.

!siger than probable sursey errer. Sig.in-ences ::uld be 2::::bu:ed to subsidence, w2rd the south to rnerg: with the S1!:

car:cly the mest pren:unced difTere.:is.'

pessibly resu!:!ns fr:m grr. dual cornpa:-

Cre:k line: ment ne:r the ::mmuni:y of elevcien change rese:!ed by the 19--

ica :( s:diments er Suid withdraw:L Filot Hill abcut' $ km scuth:23: cf:he r:!estling betw::n I.:ceis and Weir.2-Since these fs::::s are c!:2rly not in.

Aubum d2m site (53ure !). U: Idw X:urs in this same immediate at:2. s..d velved in the Aubum area. the elev;tica point in :his :rcugh is de5ned by ben:h

hus :=ds to rtinfere:th::enclusien *-e di:Terene.:s are in::;reted to be :n ex-mark RS66 (5gure 3) Icested en the the changes ree:rded in the 1947-1959 t

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-: = 13 u

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F gure 3.

' ccs::On Of ':t n mans re!a:? e :3 r r,0r "*eame 7s in the,.::inity of ina

sed A.:;.

cam T.ese te :5 -2 As 3.: res:e::ae e'eva Or : a ;es are re*ated on G;;ure L :.:::::., ~!.~3;:t ll. es:~'e :r :::n 5:..07:: a*

'e?.i. r*I?

e W

W

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g V

e

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1. ~

COMPd.RATIVE EL:VATIONS l

At.CNG STATE H!GHWM 49 EETWEEN.

j

' COOL COLOMA.

1:.

+

i EL CCRADO Co., CALIF.

i

-lr

~

p carrterwegs m 085Cavt3 c.tvAttaws amt m!;2Tivt 8

).

To ptsen vaan +:w et;3 %vamajt :N tLtvarscN-

.i.

i i

c I

880M2-d.

Et ENAT::NS CtHv!:

.d k!5E00N3 C8*EA LEVEttnG if NATIONAL OI**ET;0 !am !f 093')

v

]

!:)FiAST+Cd:E.4 t.EVILING TY O'LZ

• EP?. *F waTE A set:;A"ZS C9 *)

tsttF:cuttiF:t L*: Art =)

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EAST --

t

---

ACRTH

h. -

f fl CCLCVA y

COCL P LOT HILL

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i977

. i

!977 t

U>

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S BASE:1935 h* """ p 6.-

4

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d Su MW w>

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-z

< m a-Ox 4

a 3.,o.

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3o w,s... g 2,

a e..;.ygt.(.

-a.

I NCRTHERN EXTENS;CN CF EEAR MTN h5 l

g ga P.U TC N rAut.r :C.si g5 d

s 1

j gg I

o 1

2 Wtt3 m

P-m h8 o

1 2

3 EILOWE*t8t3

.N g

< s m=--

- scit.t 1,

sa:.7 :?tE< L NEAMENT

s

=a -,

u

. ;.re 4 Com:ars::ve e evaticas ase. g S:a:e.ighway 49 between C ct and C:!c - a. El era s C :nty. Ca:ifornia, peded see indie.2tive cf crus:21 movement

ident with bench mark '~.330 whi:h is en figure 4. Th: fcur =cs: e:s::rly bench within :his tread fault :ene, io:sted in an out: rep within the Dead-marks, nearest Colems, are within the man lineament (figure 3).

C:Ictna-Placeni!!e piuten; the remal=.

Th: r-:ults of the 1977 releveling der are wi:hin the : m; tex metamorphic t<:we:n I::=is 2nd Weimar indica::

On each side of this 2nemsly. ess:erly and me:2ve::2ni: rcck sequences which

hat si;nificant hTer:ne:s have e :urred to the vi:inity of Ecwman, and wes:erly abut and : mpdse, respe::isely, the 3

.2-dunn; th: r:!a:Neiy trief 3-ys.2r ;:Med into :he Rceklin ;Iu:en :: 2 ;: int west :(

M:untain fault :ene. The Salt Creek'

.

::h:;r:vi:us sun ey :n !? 5 Th::wo Neweis:!:. di.T:renti:t m:s ement was n:.

lin: =en:. 2 m2.::: featur: i. :he Auhe-.

.....,. _. 3 3.. 3. s..:.s

..y.. n......

. f.....,s.,.3,.

.s..

..t.....mv.:::_.:..

2..,

...,.g.

..........3

.e

.;..e........

.....9

..~

t....:.:.:. s.,.....

1),.,,. m s.........

2...

r....:.

.....e..

s n

...v

,3...

... s

• e; (2) Tne di:Ter::::s 5::.e:n the 1957 C:-:: 2nd again 2.0 km see:h::s: f T::::

2nd 1977 suneys es: the entir: AC k m Mi'/.

,... n.. : e.....,.....p.. a.. :.

4......

g.<.3. :.....

4.r.....: p. s....,. 3

...3.....

...3

.s.

n f : ;; has :,::.tred ::en; the w est.

he west by 2 :::212-: n: :( 250u: 9

- e ::=; ars::ve data C"gur: a) th:-

., p...... - r p. 3....n... g r.....

3. _......

........s.... a..,,..,,...

,. _.,.,..,2:..........3

....,...r.......,.....p.r.....

...... s........ r. ;. ; a.

'...s '.......-

....:.r.....,..33..,.....:.=.

2. c.

...a

..,33..

3...........

...........3w

..2: ;m s:: en $2:!s 5:und:d :n :h:

• j r:m Neweis:::.

m:;ni:.d:s of the cbsened @~:r:n::s

.a: tv h: C 2:ms -.M2idu hnea:nen:s.-

2r:.:

.;:hi- :he Smi:s :f;.:::n:i:.: sur.

n: en 6: west by d: 2:s::-. mar;in f CCCI - CCICr 3 -

$y errer. C:nsid--ing me :::::h t...

'.:s f: 2!t :: : : :tr tre ::.:::: wi:h de I:. ;&y 42-year ;<d:d 5:1-::n de tw:

K::i'.m -!uren. R:!a:ive to th: 907 sur.

A t::21 Of t:n 5:nch marks ::==:n :s su. ys. th: de;te: Of 1:fri ty 2.d :t-g' gr

.:y. dis :h:rg: 2;;c.rs as r::stien d:w n the 1935 and 1977 suncys provid: de se n:.: ef i:ca! di<turbance to individus.:

he 2::: :5:u an axis v: y :2r:y::in-5: sis f:r the camps 2:iv: ;r:0!: she*n 5:r.:5 mcrks is striking.

. ' f.. 2 s"a i. 7f

..,.4... e s. 3

e..g..

8-

g.

Theugh caly a limi:ed number cf bench providing a 42-year ;<ded f:r elevation chse!y assceisted wi:5 ree gni::d p.e--

C:no:ci: fau :s /. din es:h cf th: twe rnarks are !cc:::d wes: ef :he Salt Creek c:m;2riscas.The 1977 releve!ics.w:.s up.

mali. branch =s of 6: Fee:hi!!s fault sys-

ntam:nt. :he r:!a:!ve s: ability between graded to firs:-crder. although the 1935 s'.1 the marks 2::r.g this ;r:f!!: ::s:ines to survey was enly single-run, se::nd-cr.

tem. The mes: signinemn: :videne: cf ver-ti:al defermatica r:v es!:d by ::=;2:3.sion an absence of any d;.Terential. verti:21 der.

of the 1969 and the 1977 ::!eveliny,; is 2 rne.cment oc:urdng sieng this :ene dur.

distinct 20 mm e!cvatica chan;: wi&~r.

ing this time peded. Since this !cvellin:

Precisica the Bear Mountain fauh :en n=a-the d:es not ex:end for any signiG: ant dis..

tan:e west :( the Salt Cr:ek lineament.

Leve!!ng pr:cisica :an be es:Imated us.

Deadman-Maidu !!neaments wes: cf :be the pessibility cf gradas! : 3 onal tit:ing ing :he :lationship e k bD"' wher: a =

Auburn dam site.

i Or def:rma:icn similar to that observed

'the standard deviatien ci th: e!:va:ica at:ng the nenherly es:ensien(s) cf this di:Ter:nes de: ermined ft:m th: Icveling n=e da:a d-=enstrate :ha: even d.:.

linearnent (0gure 1) is act precluded.

(in mii!! mete 5) eve'r:he dis: ace:"D",in ing :he very bdef 40-.yca ;.: Mod (1933-kilem::: s (3 = ford.1971). Exped:nce 1973) over which thes: surs eys hav: tw indica::s. for Srs:-ctd:t lev:!ing. "b" is condu:ted denni:e changes in the di : -

icn er sense of v:ni::1 mevement have LEVELING ?ROGRAM geners::y in :he range ef 0.5 - 1.0 mi!!ime.

ser (mm). Over a relatively shen dis.

e,::urred. This is interpre::d is e-.:s:si re-A :etal cf 62 km cf first-ctder relevel.

tan : cf 10 km for example, a measured sponse to stt:sses of te::enic edgi.n ths:

ing wu ecmp!cted by the Califemia De.

eleva:ica difference should e:nserva:iv:!y are being irnpesed in seme episedie e:

partment cf Wa::: R:scur::s (CDWR).

be a :urst: to within ::5 rnm. Sine'::wo

=cre gt:dcal manner that tes:ilies to s

' 'A A!! !:veling was cornpicted during No-Icvelings are invcived in determining.

dynamic strain Seid.

v ember-D:::mber 1977, except fer changes in e!ev1rien, the s:andard devis.

-}

reruns of a few sections c mple::d during tiert of the ::mputed difference betwe:n These recegni: d faults and lineament:

hnu 7 1978. The I:veling ::nferms to th: two !:ve:ings is equal to the square

hst are respending :o Sis s: rain fic!d.1. r a:1 cdteria for firs:-ctder leveling. Class rect cf the surn cf the squar:s of the presumably the weak:s: s: rue:u.r21 o:se-

!!.1:ending for this r: lev::ing was pro-s:andard devia:icns cf the incividual lev.

in this part :f :he westem Sierra Neve vided by the U.S. Sureau cf Re:larnatica elings. Thus. in cempadng :wo first-<rder When this s: rain u::eds 2: streng*Fc' surveys over a.0-km I: vel reute such u these weak:r ::ces, at:d can no longer b-r (USSR) (50%), CDWR (33%), and CD.'.!G (17%).

that be: ween Locmis and We!=ar, fer ex.

a:::mmedated by plasti: deformatii:rr.

ample, en: s:andard deviatica would cen.

rupture. el:her seismic er aseismi:,.voul;.

LOOmis to We.it ar servuiv:!y amount to ab,:u 9 mm.

Icgi:21 y be expe:::d to cccur z!ca;; teds e

same paths of g.nst ::s: stance.

. -A M

The re!:veling aiong de pdmary t-ans-n: relationship does net addt:ss pes.

'Y -

S!:tra level!!ne a::nded a distanc: cf 4 sible ss s::=2 tic :rrer which :an be si*nifi-n - - N C. S

%' Y km from. car I. cmis vis :he Southem cant, parti:ularly wh:re I:veing is

?a:inc railrcad :hrough Auburn, and im.

cdu:::d s'eng a s::ady unifer-t g ad:

A!:. 'cha N. Schwan:. David P ' ~rr. -

ediately *es: cf de Auburn dam site :o s;.:h as tha: be:we:. L:cmis and Wei.

M:C~4mb.O* niSF.1977.Er;iensiErc cgy and tec:en:c.in Eanhquake evalcsal th: sicini:y of W:imar. A!! previous Ieve!-

mar. Syst:matic e ror seldem at:umu.

swdes ef de wn dam a es roc e ir; measur:ments :!:n: this r:ut: w:re la:es at a rat: gt: ster than 0.1 mm er firs -order surveys ;:-formed b*y the kiicme::r, hcw:ver, and tends to :an :1 Woodw ard-C. de s"I**0* ~

D* "..

~

' 3"'***

I A

.y ensu.t. ats.

NGS s, uring 1,11,.,19 3 3,,a,,.,, and,. 69.

eus cf a comparative :!:vation ar.alys.:s m..--

b..ve!*..3:s ata --a..#.".-.". ov--

Senne:. Jehn H -"ayter. Garv C., ar.d Tc-s:r...

A...

t Cccl to Co,.cma iden:ical reu::s and ;:nermity under sim.

peugt, 7:ss,en y, ;977,'Ceu..21 mer.-

ilar conditiens.

rnent in :he nerthe.n sie.72 my;;&

Ca:iferMa Geet:ty, v. 30. no. 3, p. 5t_ :-

The re::vc:ing a!cng the exis:ing NOS b: *in: b:: ween Co:1 and C:1:ma was In summary, r:!stiv: :!:vation :h:nges 3,:mr:rd, G.,197!. Cecd.sy. 3rd E.d.iden. Cr

..;..... _s

....,......s

. L... :,

.. : e....s..,., a. s.... es.-. s :y..,.... (:.. o-

..s...

~ rd Unive s::y Pr=2. New Y:rk.

....... s..s....;

.4

.....,.,,s.........s...,,1..._.:y s.

........,.n....,.

.c

L g -:;:d ;r:nd: da:a

m::.eure :i : ;:n.

:m:-:

t.._........... c., c. f.,...

at:2 wh: : ::

e.

.s...

. u..... s.. a u.. a.. a ~..r... s

s.... e.. u.

t a,.. r,..,....,..

1

...q

,.,...a......,....,.......,.........s..v.

a s.

s..

.....2........7

r '

a

ur: in :he ;rt.n: at:2. :h: In::

r

a::r. h:w:v::. he ;cssibi!!:y e. tis:s r.!: DiWsien :f %n-s and Gene;v.m

.......s............2.2

. s..

..,s....... 3. r..,... a... 2. 5 ; s..,. : c

...,.4. s,).

.3..

.........:..r..,.

....... s.

... v. 3.

a..

r..,...,.,......,.c. 3......

.......3.

5.an.

.e.u..

u..a,..

...n..>....... 1. ;.. :,

v...n. p... :

p..

c.

.s.,;.a.

....z..w:..,.-

1.

1. ::

? ::e E..

4; -~-::-.s M. 2 - f '- '

nnr C:::ma. A :.::: g ::nnc::.:.

n:: p :: :i:n :f :: para::,e dna.

~'

j

X 4 -. : L a

....". r N u :.. - -,

M: :-: sh.: at '" - -

• de pr..

are I:d !" D'N 2U "'2i M ^ 3P dir 1

5: M A.:.m - as P :'

• ..I:d Oe::E:

I:' f? : ~ IE~

C C N C'.;.l$'O N S

",:A t;m IM :

s 3

.'... s. '...,v.4..d...-. s... s...r '.. v.i..

..,.n,.a ma:ien..,.,c.ame..: - :.:.

n; :::::s :,,,:

n.

r' : 2.. 3..:v:r Car.ven Cyde Cr,r.s.,.:anta.

-e se :f :.n: ::en:: :., any rn v.

..s: c:;h-;r::inen.:v:...:ng d::a.:n.

rd b:n:h marks 92. : u:d h:ve ;ro.

d::n: c:n::mpora y ve-ica! ':fr m::icn 5::and. P..G., and :G:-i J.3 19 5:, sae j

yif:d ::m;2ra:he d : 2.-

Th: :nly Of s:; m,:an: mag.::.d:s :-::urer; w:$-

c.: 3 33: :, c.:;:f: Map er c2;;,._.

me. :.s ;r:::::

• d. g :: dis ::n w as in 6: w:st:m Si ra Nesads. M::: ;:r-C::Iremia D:.is:en :f mnes an: c e:-

;::::d by 2: NOS in ;92f. 6:::by

• !:u!2rly, bis :vid: :: :T erestal s:tain is (cate 12:3C). M

- 1

^

x'Arnx"M-w acus: tirs J

4 i.

Ib &

SIERR A: ' N E v' A D A :....

r i3 Sc Sm C 1

3 OF THE FOOTHILLS FAULT S

STEM

,E,N./

N D

cc FOLSOM AND O R O VI L L E, C AllFO RNI A By

.CHRIS H. CRAMER. 7CUS50N R. TCP?CZADA. AND CAV!O L PARXE Ca:ifernia Div:sien of Mnes and Gec!cgy N

M This arti:!e was =cclished as a " Letter to

,g th e ici:cr * ;n :ne Svi'etin of :n e seisme'eg.

TASLE 1.

CNOWN M C'OEARTMOUACE AOflVITY IN 7,y,.

ical Society Of Arnerica v. $3. no.1. =c.

SIERRA FOCTMtLLS 3ETWEEN HON 0*,.17 AND FOLSOM

..f.

FCR THE 8ERICD O!CIME!R !S75 THRCUGM.1.LY 1977*

245-749..:ebrwary 1372 Eciter Caro T.mo tur)

Magna

/vr.mo car) f.Vm.n l Lar N ten; W Cr:rn

!uto

",f.

INTRODUCTION eear Mewwn nee

~.

u

.- c is 12, ci is is 14

r.:7s.

ti.:tas' is a 1.3

.,..n

. occhi!!s.,ault sys::m, be:we:n ne io n 3 37 as t.

in gr

-is km 27 4

,j

_ Isom and Orovil::.is beu. sa ^e east is :2 is 22 is

sitsr

'am 2.i

- W.:.;.;

by the ner:hward tr:ndi g M caes f: ult

?s Os es 12 ts 23:s:s-12173 r

-is um t.

.3-n ea n.

ci 21.

sis ar

n9s es-

<sk-s

=

h

.~ e n t' w -t

.v A.... nc..'.w c t.

5

g ;,,.' 02 8c M*t3 6a*

n*19 4 5' c 5 ar's u

gib -

ta-c.a..-

w2rd :r-d,ng se2r Mountain fault zone.

n :2 c7 14 as arts er in7:r

- 4 km t.3 J. %.m ;

?.::ent s:udi:s have f:v:sied mere ex:en.

~ hf.

sive L:te C:ne::i: fsainng : hen previous.

Vca's ha' 7s it is

s,44 s.s 54 *.:-

i:: 5,7 14-

.m t.1 11

-:o em t.:

t.v fe..g 2:,.a. vi.s.:n.i....

s.... e. :. r s

.s.:.2.,0.1.t.,.ue:n; pc(:::ns c( th: roct.

. ::s faul: system (AI: and Oth::s.197 M.:r: ear:. :.aies : at :::wne: in m 8:: % p.uten are no: teste: in

,il Schwarit 2nd Others.1977). D::nsging

+s :*o'e. Wr are "$:e:

• Ce*' a : ::ws itsnl.

t.

-..E_

car-hquakes,in the mag.i:ude range 5 te r.,;

5.h25: c::urr:d within :his ?enien of:he N. n. 'r~

Fec:hi: s fault system In 197f. l0 km 6~~M ~

sceth :f Or:sdte. 2nd in 1909 and 1$$$

ef:he Foothi!!s fault system ncrth ei Au.

Me'Ortes Fatelt 7.One JN about !! im nenh:2st of Nevada C::y bu n.

3e:w::n De::mber 1975 and

-T (C;ure 1. ft:nt :ov:r). This sni:!: sam.

M:rch 1977. sesen su:h :ven:s w::: ::.

3: sides the thr:: 'dz= 2;in g es n h. '

ura::s :udence ' m :i:m srh;u2Le

rded. Marks and Lindh (1977) ::es: d quakes m:ntion:d in :ha in te:de::ier.

sur.:y s. ' :m '.ister.=. unhq:2k: re-

wo :ven.s s:::'su: :f H:n::: 2.d :n

h:r su:hq sk: 20 !d:y ;;in:s : -: :

ns. anc== ;t

:::.: :ars :) s 2t

.ent u.s: Of Marf sx:i: 7;ure U. Th:

th: M:::ner ::n is be.n; 2:...:. C.:. :

the F::::- ;:s f:u'.t sin:. is 2::is: 5:-

..:::h:m :so :s:::s e::arted en -'e::m.

(;i'S) !!s:s (e.: ::;:r.s Of c:.nh;.:.::

t a e: C s..;:: 2nd ?:::::m.

5:: 19,1975 2nd !:. cry 1.1975, whi::

n=

N:uds Ci:y u far ts:k u ;Ii7.

he s:2:h:= es: t :::.m:d ca '.!2y 3.

A:so ist:d by C::cd at: Tw o m2 ;-

, j :... 2t.

. :... a ~. ~. s.... :. s.....,.. :..........

.. a..... 3.s.,.,. a, :.... a t,.....

3 E.3 V:C;' Y E ~' *. E EN ed :.2;.itude :.1 u.-h;;2 : 10 km eut 21: 3 2.d:e th:w:st:f th:M:::n es ::n e.

1..

.,t..:.,........s.....,.

2

..............s.......

_... ~ -.

13,1976., ne:: :-: IS:::u-.: :9--)

cf A.bem en Manh 12..:!. 2n - : :

I4:. 0 r t a '.- 02."Z:rS te;:t ed : se es:.s

-- -mi::e : hat s:::-d ateut :$ im :-: :hwes: cf N:.2d.

2rted en A;;.st : ;; 5 :nd 5:;;em.

C.: On C::: -:t f. 30 (:';ar: ~;.

Ea..

?:.: wing ::.: 1975 Otr..::: e.:- h.

.- 2. ;976. Fina:!y E:::n 2.: ::h::s ten ud 0:h:rs. (1977) :nd E2:en and z.:.: im;rssed ::;i nzi 2:::= ;r2;h C ;77) ' - ' - s e.. es: ef Men:ut C:

.s (1977) d:::::ed :w o m:;.

ven;: hu :: :o the I:::::ica Of ses.

w hi:h ::::: e: :n Feb. 22:y. ;977....:

ni:.d:-!.1:s:nts en th: Me::nes ::n:

s j

s! ms; nut:-1.3 m::=unh;;:*cs

-h;. ;o:::: :: pt:==::.. f:t these s:ven usic; s re::nt!y insts:::d re;i:nal s: Ism:-

r:n; :he 2 ::: n er St : M:un::in ::n:

es ents 2:: !!sted in :25:: :

gt:;h nc:* erk. Th: hy;o::::m! ;:-.- e.

.,...s..s....,

2.... a a,...,..

.i.

v

}.

g '.

. e_

{ '$

p o.

f.

l

/

D

~ lW.T.

39.5 J

.Crev Y

h

.?

e.4

+-

s.

O.

.e 9

I a

Y t

j e

-r k

O

\\

)

4 w

- 1 y

Hwcue e g,

figure 1.

Ma: of nce:ns E

\\

y r*

part of F ::Ni s fa.d sys t a,

x

. r,,...s. Cw e

show'ng kncese ur.nc:'.,a

~ - -

. pyJt(M

_ \\,+

- ?

-4

=

O

ac6vhyto-ee-O-Me a '

. fs

+

O o cres s wr,.[

FO!sem. The ::-:.as: :: '

e g#.:s::T r".

, smortv& -

f si ""

+

o o

,ves: =n e s a a, =n:

D k

O fau!t : ens is : e t.:w.0.

1

.4 v

-T.

between the S.a :ra r.e -

.L Tw'.e c:ey. e Marn vi3* d

,i Va:!ey and :Pe SNera f c.

(I h.its.Ha:nure: . e ind*:_1.

+

bouncary O t:a t-2n

.e n0 :

s,

yk tin Penryn ;h t:- and ena 4

vC!Canic rC:ts Of tha IG.

y f"

hills. The 1*23. I s. ar.d M Q

4 39

-t-El e

earth;ua'ces we e researt

.a.

O ed by CCrAC: fer th.e *.

III 3 f

12 2

$< ale and :509 events See acc:

ada and o: Mees (1973).

k o

l'o 2'o km L..moin e 7 o Aweven MN 02 Cv'tLt N M-3 (Clowd '976) 4~k pgsryN g

2 W 3MCCX

=

g e st:973 01C,1975 -Jt:LY,1977:

q pgty;c,4.rj q.,7 R kJ;n e ary C"'

His:OttCAL !V1H:5:

9 M~2 u

C y 36 w Mal Resev.

m e.c-

,,7 e.C.E;

. M < o.5 E

ra-O s-4 em j

v.i;.

4

f. 5 v%.....

i

=..~. ::

ien f:r these two ev:nts tr: siso fis::d in E.2:en 2nd others (1977) :nd E. sten and COMG G::'.:;ist, cral ::=r..:::le:n rz::: 1. The Srs: event x:urt:d 10 km Cen:ns(1977)using a re;ien21::leme::.

A t and ethers 1977; Schws :: a.nd och us: cf Auburn :n February 7.19 7 :nd ed cc:wcrk sh:wedcn geing 2::ivi:ywithin 1977).

th: see nd 7 km west of S:vada City en the cluster n:2r Rxk!in. the 2rges: being Re;cr:s of felt canh:; cakes nc rIC:J May !!,1977 (5;ure 1).

two magnitude 1.6 events.

lin are rare (Townicy and AIIc:2. JS.

Belt 2nd Miller,1975). Clou.:'. (Isr;sy Composite fecal =e:hanisms based en OETAILED STUCIES NEAR

?-wave Srs: netiens f:r both the Roc'4in his review of the s:Ismici:y ef the a.

30 C.< L!N clus:er er 2::ivity and :he f:ur events : ur re;ct ed only :hre: his::.-!._: ev-nte

he ner: hem :dg: (the Rock!in-Penryn may have cc:urred e2r F.:,:kli.

?^-*--

22 c:. 2: f:;.:!ng. don t:

h t:- :ve.. s at: 2

'"+: :- :::::nh:un: "ns esti;::!:ns

.

:n indi:2::

'n: 23:. :n f22.: ::an:s :rdin; ab:u es:n:. :n A;n! *.t. !!.: :.:.: r:::

ha : b::n ::-de::.d in :he Wein::y cf

? < :in. C2.c:rn:2..ne :.rs::y M:Naily S:0*W wi:h dips :f :$ : 70* :e th: ::s:

f:': in ' :-:2s::: (! i.= 5"- :'.:.

j s-d : h:. (::73) :is::*:::: micr:anh.

(Cr:mer and :: hen. F77: M:N2:ly and 2nd 2 May 30, ;971 ev:nt ;:-:::. -_

r.n t ::mity with n :n: R::i:In-?:ntyn

h:n,1975). This trend is : ;a:ib!:

in F::s:m 2r.d R:;r:r.2' (T:..-:n

• .::n. S: ng tha: sars:y. mi:::<2r:h.

w::h :h: re;ien:. f:2.: ::nd Of:h: S::::

A:::n. : 3 R A sur:h Of ::d.eu !-

.6:s W g !) wer:::ne:::rs: d in 2 fee:hilis. ?-w av: :. :: =: ica da:2 from by :n: ef the 22: hen (O.* ?.) ;. :.

.gs...........'..-t"... *:.* -

.c

. u..._

....r

..... _,. s...s.. u.. m

.s....,.............

.... c...

? : :In ut'. :w 2dd::i:n21 :s :n:s (Ec: n :na :hers 3 7) ::s 'nd:: : s "D.: : -: n..::t eu.u -: : - :-

-::: !.i.::'n ;E;ure D.

~"n : :::end n:rm ' ':2.:ing. d:-n :: :he us: :nd is th: :w:;;;: 2:::unts 2.5 fe'.

c:

:<s: h ud: turv:y by Cramer and

T.;2:. I: m:h :h: : m;;s :: m::5 N:".:ss;::. w hi:h is b.::- e:n 7 :-:V

~

2nisms

h: ?xkiin ;b:en 2::i.!:y.

A; bum. Fi;ure ! sh: -s :. u::

!*:r:::: '19771::n -.:d :h: ;r: en::

7: c:st:r cf 2::isi:. n::t ?. :k:in and T'-issens.f d:*n to th: cu: m tion :n m:;':: th: 005 :sen: basri en :5:

d: ::::d add;:icas! mi:::::n: :22ies (M 2 nerma; uit is : iso ::m;2t:::: wi:h ;:o-

,

t :::::n:s. A - u!=== re;.: -

j

< :) n::r :he ner: hem ed;: Of th: piu.

!:;ic chs.:..2:icas ::sewh::: :!:n; th:

nsi:y cf IV V 2. d 2 :::: re.: 2 F x:hi!!s E dt sp: m (Crew Smith.

2 bout 10.7*'O km's ;;:s: : 7.i:h::-

l

r

1). Cen

inu:d..:ni: -ing by i

• a C2..!::e a 's - :;y Av;.si T3 9

-.t~'

s:

!MAY 30;1908-E JHOUA' E f

Nov1h City.2 Cefuse

- ).m

- Gres s Volley -

. Me r ys v.lle a w= = = m N C O

i 3*4 Alt. J.N., M:Crutnb.' D.R., S:; w an:.. D.P

• )

and C*uff. LS 1977. Char:::eristies of ~

3 9..

I.sre Cenozoie faults in the -:< em S:c-.

gg,ygg shII:FFer Gop Nevada. Ca!ifornia (aht.a::): 0:eleri 21 Nubun : +org e t o n_

Society cf An edes aWmu s.ah ;tegrama r

N o we e s ile+4 g

v. 9. no. 7. 877 p.

IV

.s.R o s e v. ll i

Senne::. J. H 727:or. o.C and 7:;nc=ca.

i T.R 1977. Crustal moverne:t in :he ner.h.

dRepreso a.Flceerville ern 5:erra Nevade Cdif:rma Ceciogy v.

. Folso

/

30. no. 3. $ t,-37 p.

.' /

Bolt. B.A., Milfer. R.D 1975. Cats!cp: Of So cr=m e n to.3 canhquakes in northem C !ifernia and ad.

/

joining arms.1 January 191C-h December

/

1972. Seistnepa;h S:stier.s. Un! ersity cf N

j Ccifemia. Serke:ey. Ca*if:mia, !67 p.

C* cud. W.K 1976. R:;cr: en evaluation cf s4istnic data in the Aubum dam aren C.*n.

2S,m suhanfs Report to the UA Surmu of Rec.

a tamatien. 36 p.

Cramer. C.H. and Sherhrne K.W.1977. Mi.

crocarthquske a::ivity in the R:(ci..P:n.

ryn pluton west cf Auburi. Califernia 3 3'-F (abstra::): Califemia Geciegy v. 30. no. 6, 122*

T P 140.

121 Craener. C.H.. SherNrne. R.W. Toppouda. -

. Figure 2.

Is:seismal map cf :he'May 30,19Cs earthcuake shcwing T.R and Park D.L.1977. A micr: car:5 Mccifiec Mer:aM inters::y data determined ft:m eewspa:et re: Orts qune s::rvey cf the Roc

• Is-P:.ry t ;Istoo and the !! and IV is: sets-a's. The generali:ed.:::tniits faJt system in the SI: ra Nevada focthi!1s wes: of Au.

in Me A.Nin arsa is shevvn :n the backgreued.

burn. C:lifornia: Cs!ifer=ia Division cf Mices and Geolegy. Ope.,-FI:e Report 77-n:Nde f about 4 for :..ms canhqune. A1 event east cf Auburn are ecmpatible w. h 11 SAC. 29 p.

it

hough the epicen::: unne: k r:.:!selv regional geclegy and : rends :( the Foct.

~

de.Gn:d, the intensity IV c:nteur sugges:s hills faultsys: m.These r=:ultssuggm:that E2'*"* E7

• McHugh. C, and I eter. F.W, 3

19 Repe.n.e.n:niercarthpaka meestor-t.s.2: :n event oc:urr On :.,,.: -occu!s

o..

s be:. Reck!ta-P:cryn -lu:en :.s r:sently ing in the vic:nay o Auhrn dam: Ncvem.

r e

f2u.t sys::m between Aubum ar:d Feiscm 5 de:.ctmed by the same re;,enal ber 1976-March 1977: U.S. Geo:cgical in pr:xic.ity :o the recent microcanh.

s:::ss patt:.n :hr. caused Cenezeic move-Survey repon :o the Ear =au er Reclam2

~

ne a

:ivi:y near Rocklin. Tne epicen.

ments c:sewhere en the Fecthills fault tien,73 p.

for 6is event shewn in figure.!

system. s ne tscscsmals cf a 1903 esnh-22:en. L,. and Cenens.,,19.,., Rep:rt en c rrespcnds to the : enter cf:.:: tatens;:

take sugges dat macrese:smic 2:::vt:y

..cc s.,..

e.... :. g :...... v:. : a.

IV ::::Our in figure !.

has 2!so ec:urred en de Fecdi!:s fault i:y cf AuN= dart. Apil.J ly.197 :I.*.S.

system in the vicinity of ?ocklin.

Geuleg42: Survey reper: :o the U.S. Su.

r=m cf Ree!:rnstion.

DISCUSSION 3enne:: and. ethers. (1977) rrsented Mar.ms.. S and., dh. A.,197* Reg;cnal sc.

.s.

. d:rendent ev:dene: cf engeing cr::stal ras.:.y e e eiemn i w m ene vientew

n

%.:rocanhqua.x: stud.ies in th: S.ierra

=cvement bas:d on first-order !: vel,.an=s of Crovine. Cc:fornia, i= ;res.

focci": sin:: !st 1973 have ::ve21ed a betwe:n Res:ville 2nd Reno. ne leveling Mc[)any.[. $$, $'fa-m

5. d.m a.G N.an a gn Doue2

anem cf eng

ing 1:w fevel seismicity da:a shew :;isodic chang:s in eleva:icn be:we:n Or:vil:e and Frisem. De xcur-which :;;reximat:!y :incide with de Cct:.it Metin

'm

ne: ( se eral n sg.: tad:-l." o e.u 3 ear Mount 2:n and the M:!:nes ::nes :f O.: n - $,s ::m: <.:d n:a::: est th:s 2: ~20:$i!!s f: ult sys::=. As w:$ :2r-h.

i.e... e...a.,. c e..,.- :-. >.

~

e r

N:-!:n :( S:. :.::

.5 ::a.: sp::m is jun: dns. 6:::velin; sh: s 2:::2r;;r

ive. H!: :.'n' =n4n re;:ru :nd e.smera s:: o:::..-"n;; : he M :en-s M" 2 ~f-

',[][,'QAM,. f((_-

i.n.=:.:21 ::m :,.: : :::n:r :s 2:sc fr..: :::: e:: :n de En-M:.ni..

'.. *, _ :. ll.' " ', '. ~.'.*

.., _, ---,],

~~~ ~ --- ~ - - n- ---

. 5....:.........s:....

n,.,

.r... : t....

+-

3,. _3 3 3 3 m.,

3,._,

C.dif:.62 (sh:.::):C =h: 6; r.:.:i:, er F

, e:::.,.... -v es:;;::::.s in :.,.: v::m:y c, A-

.a >: 2::.s v:.: p;p.-9,, 3, A..b-. CC':--Ls h:i: sh:wn mi:ro.

A C CC.VLE O G.'/.ENTS

. 7. U 63 p.

u.-h: n:

_,, e i:

r.: ? :ci.Sn.

2:

• ;:03..n: m = :b5::t :f ::::. -

..r..,,f2 7o,.

. q. D., 2,...._...,.,s,..,

v.

• S c u,.,.

...;;x: c :.n2ns * :: :2m.

.e..e/......: :.. m-...:,....,.s...-

s

• e. d e :' n : ; S : n an d is h.23; Of T:Odw:rd-C!yd: Censu!:13:s

en: Cc.f:~.i2 0.s.3 u er v.=: 2 g g e.

n

• r..N :::.n e: c:::! :m*'isdur:: v:.

f:r se.9 ding us ::-i:s Of n:A spa;.:t 2:.

c::ry. !;c::s ? ep::: !E in pe..s.

f

. 2.n :S:: :Nn.r :f.e.

s=13 :venu

unts fer $c hs:cd:.d :2-hquak=s.

,,.d,,*: 'c 3'..~,~,.7.',C,.'w'y".y f.3..

a

' '. ~.

s..,~.:f., ".f'-

,:. ar n: nc.'.em m:r; n :f 2: ;h :in Gary Ea::: studen: 'nt:-- ft:m :h: '.*ni-

~..r...'.1-u--..

-ner::.n: F:cdn..s,.u.t sys::m s:ets 6:

5 :tsi:y c, u,,,:rn.is a w,av s. 2:s:st:d :.

ei.i: Cs.n ofr e U:J a s m 1 5._;9 n

..)

- ;:.::n. C :;csi:: fcer.1 =r.hanisms for ev2!:2:ing de his:ori:si n.ews;;;er ::-

3 ;::!3 s a r.: eg:.;rg,:7 e A::.eg:.=,

r

:n u - r.1 : 6: ;:'.::n :s :112.s f:t :::

un:s.

v.29 p.1-297.

W

,,. =...

9 4

J Y

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Y

_...--....r_

UNITED' STATES iTOMIC ENERGY.-CCYMISSION In the Matter of-SAC?JdES'IO MiNICIPAL UTILITY DISTRICT RANCEO SECO NUCLEAR' GNERATING STATION, UNIT NO.1 Docket No. 50-312

c.,...,........ - ;. ; i',3 C..

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2.5 Greendvater 2

Grcundvater in the Rancho Seco area is s:cred chiefly in the 2

Mehrten-forma:ica and is part of ' the Sacramenfo Valley Gr:und 'k'a:er 4-Basin. The nor=al water table is in excess of 140 feet below nz ural 5 -

ground surface.IO)

The grcundwater =ovemen: is to the' southwest 6

v th-a hydraulic gradient of.10 feet per =ile.

The cuali:y of e

~

7 groundwater is h'gh and eets U. S. Public health Depart ent standards.

It has less than 200 pp: solids.with less than 50 pp: hardness (CACO ). (c)'

o 3

9

\\. 2.6 Geology t

10 The site is located in the icw hills at the edge of Sierra 11 i Nevada Mountains and is fcunded on the Pliocene Laguna For=ation,

'l t

12 j underlain by an estimated 1,500 to 2,000 feet of tertiary or older T

13 sediments deposited on a base =ent co= plex of granitic to metamorphic it.

rocks.

The cbtained site exploration da:a indicates the unfaulted 15 i nature of :he sedi=ents and their suitability as a foundation upon

.16 which to build the preposed nuclear pcuer generating sta: ion.(10)

I 17 2.7 Seismolo2v 13 There is no indica:icn of faulting beneath the site. The

~

ne ?.r ec : f:ul: sv. ::en, :he 7:rthill Faul: Svs:es, is loca:ed about 4

9 20 1: ti".es :: :he eas: Of :he site and has been ina::ive since the 2..

Jurassi: Ferici, s:re 35 milli:n years ap.

The a:-ive faul in; IT al:ng which his t:ri: ally large ear hquake sh::ks have criginated

2 are :he Hay ard and San Andreas Faul:s, sete 70 and 59 riles :: :he vn: respe::ively, and :he faul:s 30-plus ciles :c the east, beycnd i

r,.

25

- the Sierra Nevada Range. " '

e Et i

0,

-"69~~

4 d.

.There fis no reasen-to anticipa:c f ault prep aga:L en' in ' the. sit e e ~

1 1, area.

Earthquake' shaking::ay occur as the result ici, shocks along

,i 3.;

dis:an: faults,:bu: due to their relatively dis: n: crigin and-4 4.'

na:use of the f oundatica naterial beneath the size, ground accel-l.

5L era:icns of no greater than 0.05 g'shcul,d occu: during the 'lif e: cf ~

t 6}

the plan:.

A conservative value of 0.13 g will ae used fer the r

4 7

design.

The. ability of _ the plant to be safely shut dcwn vill no: be 8

inpaired in the hypothetical even: of a maximum heri:en:a1 grcund -

. acceleration of 0.25 g.(13,14)'

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L 10 2.8 Environmental ?.adiation Menitoring 11 An enviren= ental radiation =cnitoring program vill be con-12 ducted at.the site to establish existing background radiatica levels 13 and :o detect any changes which =ay occur.

Surface, well, and 14 rain water; air; = ilk; soil and silt vegetation; and fish and anical 15 sa ples will be, collected and analyzed for gross alpha and gross 16 beta-ganna activity.

If any significan: amount of activity is 17 found, :he samples will be analyzed for specific radio nuclides.

Sampling peints will be loca:ed both on-site and ef f-site. (15) y la e

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w SAFETY EVALUATION e v. t.u..r :

a DIRECTO?lTE OF LICENSING U.S. ATOMIC ENERGY CO.' MISSION Ih.

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LL SACRAMIh 0 MI NICIPAL UTILITY DISTP.ICT R.C'CHO SECO NUCLEAR GENERATING STATION UNIT NO. 1 DOCKIT No. 50-312 JU';E 8, 1973 r'.' *x

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.5 Geoler r, Scienclo_e.. and Feendatien Incinearine We and cur consultant!s reviewed the geology and seisnology of the PJ.ncho~Seco Unit 1 site with respec; to faulting, founda:icn cen-

'ditiens, and intensity of earthquakes at the cons truction.pernit.' stage of our review.

No infornation that has been obtained since our construction permit review has changed our. previous cenclusions.

We-find that the site relative to its geology, seisnology, and foundation conditicas is acceptable.

A horizontal ground acceleration of 0.13g was used for the operational basis earthquake (03E) and an acceleration of 0.25g for the safe shutdcwn earthquake (SSE).

These accelera: ion values renain adequate for seisnic design of the plant structures and conpenents and have been discussed in detail in the staff's Safety Evaluation

. Report for Rancho Seco Unit 1, dated August 12, 1968.

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