ML20147C553

Forwards Testimony on Behalf of Intervenors Re Contention 1, Geology & Sets Forth Conclusions Re through-going Continuity of the San Gregario-Hosgri Fault Zone.Resume,Study Results & Cert of Svc Encl

ML20147C553
Person / Time
Site:	Diablo Canyon
Issue date:	11/17/1978
From:	Graham S AFFILIATION NOT ASSIGNED
To:
References
NUDOCS 7812180324
Download: ML20147C553 (19)

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UNITED STATES OF AMERICA-NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD TESTIMONY OF STEPHAN ALAN GRAH AM On Behalf Of INTERVENORS Regarding g

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In The Matter Of 1

DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 &2 Docket Nos. STN 50-275, 50-323 1

NOVEMBER 17, 1978 THIS DOCUMENT CONTAINS POORQUAUTYPAGES 7812180 3 4 7 812 7,4 g..

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TESTIMONY OF STEPHAN ALAN GRAHAM cot On Behalf Of INTERVENORS*

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con ENTION 1 - GEOLOGY g

DIABLO L

/0N NUCLEAR POWER PLANT, UNITS 1 &2 g

Dacket Nos. STN 50-275, 50-323 1.

My name is Stephan Alan Graham.

I am currently employed as an exploration geologist for Chevron USA Inc.

I have been sub-poened by the Joint Intervenors to present testimony at this proceeding.

My resume is attached to this testimony ( Attachment A).

2.

This testimony sets forth my conclusions regarding through-going continuity of the San Gregorio-Hosgri f ault zone.

3.

"y conclusions are as follows :

A)

Geologic evidence suggests that the San Gregorio-Hosgri was continuous f ault in the past that was the focus of shear resulting from the stresses generated by the movement of the North American and the Pacific plates.

This evidence is discussed in Attachment B.

(b)

Although this evidence does not require through-going continuity in the present, it is suggestive of present through-going continuity.

Further, I know of no geologic data that precl ude such continuity.

• Intervenors are:

Scenic Shorelines Preservation Conference, Inc.,

San Luis Obispo Mothers for Peace, Ecology Action Club, Sandra A. Silver, and John J.

Fo rs t e r 1-1

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1 (c) -The focus of' shear appears to have moved east to the J

San Andreas. fault zone.

-(d)

Factors cited in my study which could be considered in evaluating the significance of the. San Gregorio-Hosgri fault are:

(1) geologic evidence of former through-going continuity; (ii) magnitude of the past offset; (iii) physical tie to the San Andreas; and (iv) orientation with respect to the San Andreas.

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Stephan Alan Graham 2136'creenwood Dr.

San Carlos, CA 94070

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r General Born 4/25/50, Dransville, Indiana d

Varried 5/27/72, wife-Pa=ela,1 child U.S. citinen, milite_my status-1H, foreign language-German Education A.B.

Indiana University 1972 Geology, with Ronors

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M.S.

Stanford University 1974 Geology J

R. D.

Stanford University 1976 Geolegy j

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Specialization : Sedimentary geology, in particular sedi=entary tectenics Shesis: Middle Tertiary palecgeography and structural develep=ent of the Salinian block, California; Ph.D. ce==ittee:

W. R. Dickinson (advisor), J. C. Ingle, Jr., B. M. Page Professional' Experience 1.

1968, 1970:

Subsurface mapping, Frit: Operating Co., Ft. Branch, Ind.,

(su=mers)

X-ray diffractemeter technician, Indiana Univ., Bloc =ingtod

> 2.

1WO:

Ind., (part-time )

3 1971-1972 :

Consulting geologist for Peninsula Exploration Co., corpus Christi, Texas, (part-ti=e.)

4.

1972:

Associate Instructor, Indic.na University Geologic Field Station, Cardwell, Mentana, (su=er )

5. '1973:

Research assistant, Stanford University, Stanford, Ca.,

(su=er) 6.

1973 :

Instructor, Stanford Geological Survey, Bridgepert, Ca.,

(su==er )

976:

Research Ceologist, Exxon Preduction Research Co.,

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Houston, Texas 8.

1976 -

Exploratica Geolegist, Cicvron USA Inc., San Francisco,' CBs Awards, Ass'istantships, and Fe n owships 1.

Earth Sciences Freshman Scholarship, Indiana University,1968 2.

Arthur R. ftt: Distinguished Scholarship, Indiana University, 1968-1972' 3

Indiana University ceclegic Field Statics tuition award,1969 4.

Standard Oil of Texas undergraduate geology award, 1969, 1970 5

Best student. paper, Rocky M:n. Section, ceol. Soc. te. erica,1971 6.

Senior faculty scholarship award, Indiana University,1972 7

Ei Beta Kappa,1972 8.

National Science Foundation Graduate Fellowship, 1972-1975 4

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2-4 Professional Societies Geolegical Scciety of A= erica Society of Econc=ic Paleontolegists and Mineralegists Sig=a Xi t

Guham, S. A.,1971, occurrence of =iddle Ca= brian is Public ' *.ons bbatana:

Graham, S. A., and Suttner, L.J.,1974, Occurrence of middle Ca= bri 383-384.

Ihe Fbuntain Geologist, v. 11, 71-84.

islands in southwest bbatens:

Grahan, C. A.,1974, Re=anant magneti::atien of modern tidal flat Geology, v. 2, 223-226 from San Francisco Bay, California:

l Graham, S.A., Dickinson, W.R., and Ingersoll, R.V.,1975, Hi=alaya model for flysch dispersal in the Arpalachian-Ouachita system:

86, # 3, 273-286.

ii Dickinson, W.R., and Graham, S. A.,1975, Sedi=enta:/ environ =

Geol. Soc. /cerica Bull., v.

l sy::te=s with applications for petroleum geology; W.B.

San Joaquin Geological Society Short Cour::e, Rakersfield,1-10.

Grahe=, S. A.,1975, Tertiary sedi=entary tectonics of the centralCe Salinian block of California:

v. 7, no. 7,1089 tectonics of the central Salinian Graham, S. A.,1976, Tertiary sedi=entarfPa.D. Dissertation, Stanford University, block of California:

California, 510 p. Tertiary stratigraphy and depositienal enviren=ents near Tne Neegene Sy=posium, Graham, S.A., F ', Menterey County, California:

125-136.

Pac. Sect., Soc. Econ. Paleentologists and Fineralogists, Indians Sc__

Graha=, S. A.,1976, Tertiary stratigraphy and depositional enviren

/cer. Assee. of Ietroleum Indians Ranch, Ibnterey County, California:

Geologists Bull. (abs. ), 2181-2182.

a Graham, S. A.,1976, San Gregorio Fault as a =a.jer right-sl San Andreas Fault system:

Graham, S. A., Ingersoll, R. V., and Dickinson, W.R.,1976, Co==

v. 8, no. 6, 8co.

for lithic grains in Carbenifercus frc= Cure.hita Mountains and Bla 46, 620-632 Journal of Sedicentary Petr=legy, v.

6 Dickinson, W.R., Graham, S. A., and Ingerso Warrior Basin:

Bull.

/ser. Assoc. Petroleum Geologist::

margin of North /cerica:

i Grahem, S. A., and Dickinsen, W.R.,1977, Apparent offsets of o (abs ), 2179 Gaol. Soc. A=eric a features across the San Gregorio-Hosgri fault trend:

Abstracts with Progra=s, v. 9, no. 4, 424.

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Gre. ham, S. A., and Dickincen, W.R.,1978, Arparent effse ts of on Science, v. 199, features across the San Gregorio-Hosgri fault trend:

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179-181.

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Graham, S.A., and. Dickinson, W.R.,1978, Apparent _ offsets of onland geolegic Calif. Div. Mines features across the San Gregorio-Hoscri fault trend:

and Geolegy, Special Report (in press ).

Grahem, S. A.,1978, Role of the Salinian block in the evolution of the San Andreas fault system:. /cer. Assoc. Petroleum Geolegi:sts e,til.,

v. 62, # 11 (in press ).

e Telephone (415) 894-0308 (offiee 8:00 AM h :00 P:4.)

(415) 595-2036 (home )

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r ATTACHMENT 8 APPARENT OFFSETS OF ON-l.AND GEOLOGIC FEATURES

ACROSS THE SAN 'GREGORIO-HOSGRI FAULT TREND 2

i and William R. Dickinson

.By Stephon A. Grcham Ab5troCt

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Componsnt foutts of the San Gregorio Hosgri fault trend, roughly csincident with the present centrol Cetilorn'a coastline end port of g

the Son Andreas fouh system, moy have esperienced about 1!5 km g

4 af Neogene right slip. Evidence for right slip consists of poss;ble poirs of offset geologic features, including (1) nectly identical

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Tertiory sequences of Point Reyes end in the southern Santo Crur Meunicins, [2) simi'or Cretaceous and Oligocene. Miocene strato of l

Mountains and the northern Santo Lucia pgo the weifeen Santo Crv es Ronge, (3) the structurci cen'oct between gronific bosement and franciscon cornpfen north of i!ocess Head ondin the northern Santo saa sauenio

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Crvr Mountains, la) tectonic stobs of porossiur, feldspor.beoring

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Sur and senditones within the Franciscon comp!ex near Point

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=>m a ct Combrio. (5) fronciscen.dsrived Miocene sendstone near Point Sur

• M end polentic! source terro..es to the south, end (6) Mesozoie ophio.

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• life end overlying Tertiory sections near Son Simeon end Point Sol.

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The suggested rig it.si;p is dei; nite!y post.eorly Miocene end probo.

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5 bly post.rnidd!e Miocere. Because the Son Gregorio Hosgri fault trend intersects the Sen Andreos foult ofhhore south of Solines, the

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' totol opporent offset of gronitic bosement olong the Son Andreos s.am h

' foull b octuo!!y the sum of ofhets on the Son Gregorio.Hosgri and

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d the Son Andreas foulu. Comriorison of time.dispfocement curves

" demonstrates that these two faults account for inuch of the post.

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' Oligocene displacernent between the Pocific and North Americon n[

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plotes. RecogrJtion of Necgene Sun Gregorio Hongri right slip thus teduces considerably the oppcrent mognitude of right. slip olong on

,torfy Tertiory proto. Son Andreas fault.

Major elements of the son Andteos f owlt system, centsof CoWr.

FlOt.tRE 1.

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INTRODUCTION S uth of the on-land type segment, the San Gregorio fault has E.arly r.cologic mar;4njt of the centes! California coast demon.

been traced by seam:e profiling across outer Monterey Gay and

, strated that striking stratal dacontir.uities exist across the San Monterey submanne canyon, and thenee up Carmel submarine

. Gregorio fault (ngure 1) some 50 km south of San Francisco cany n (Greene and others.1973). Greene and others (1973)

(11ranner and others, IM). Onginally mapped only as an on-rnapped the San Gregano rault returning ashore a.s the Palo Colorado fauh in the northem Santa I.ueia Range between Cat.

1And fault segment runn:n; from near th: wilace of San Gregori rnet and Point Sur (neure 2), and referred to th: oser-all trend

. south to Ano Nueso Pemt.the fault now generallyis considered to frend e'hhore near San Gregono and to re-< merge at Pillar as the Palo ColoradkSan Gregorio fault zone. This pa;<r, Point. 20 km ta the nenhwest (tipure 1), as the Seal Cmc fault however, adsecates :in attemative to the Palo Colorado conn x-

% eNr.1974),

tion. Evidence h offered here to imbe. ire that the San Gregono (e g., Glen,1959; Jennh ps and Iturnett 190lt Thts conneetmn ha not Nen sen6ed rigoreush, but a senes of fault me,tead is cont.nuous, via a girtion cf the Sur fault zone.

• "* W. N # "S linear shoah e.stendinr,sauth irorn the Seal Cm c fault acro.s the O'

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mouth of llalf Moon Bay toward the San Gre;ono fault male

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• I5 l#'""#" #!I the connection a urtual eenamty. Senmic prenhng data e, tab.

brandung and en evt@n segments of thn ecmpfn vistem re-0"#

W "I""I#"'"d thh that the Seal Cm e vg ncnt of the San Gregono fanit trena

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k used.'" hu payr to de.ignate the whole array of hnled rierthward elishore from W Franets.co to km the San Andrev, mt fault rene unde water wuth of the town of liehnas (Cooper, traces.

1973).

In in type area, the San Gregorio fault censkn of a near vertical strand or muhis le strands faumng a fau!t sene hundreds

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p[gng[grgg;[jg %{ag(,jy70,{ggggnjgp ag3dgghgg jQ Q %*g5 9er.f.e4 tlrut4My, $ter.rsed slal r.wma H M1.

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Itetatiomhip of the Son Gregorio, 4'

Sur, and Polo Colorado lowlts in the Point Sur pomf su't l

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.I cr,1974). uprer Cretaceous sedimentary roets crop out etten-THE SOUTHERN SAN GREGORIO sively w est of the fault in the San G regono area but are unknown FAULT ZONE AND RELATIONS cast of the fault in the Sr.nta Cruz Mountains; conversely a WITH THE HOSGRI FAULT wu-des eleped Paaxene ihrou gh o'igmene sequence is present in the Santa Cruz-Meuntains but is absent west of the fault (Cununings and others.1962). The occurrence of gencrully From the head of Carmel submarine canyon, Greene and similar Pbxene marine rxks on both sides of the fault in its t> pc ethers (1973) projected the San Gre;;orio fault south into the s.res led presieus ins mi.ators to conelude that the San Gregono Palo Colorado fault onshore (6; ure 2). This connection requires t

fault had essnenced no signincant sinke-slip mosement an abrupt bend in a fault traec that is otherwiw rather straight.

(Cummints and others,142). Iloneser. the similanties in Data are rather nsor otTshore in the ueimty of the presumed chan..:ter and otientation of the San Gre:;on,o fauh and the San connection (J. Dohrenwend,1971; grsenal communication.

Andreas fault promptcJ lidt and D.bblee (14$.1) to suggest that 1474). how ever, and the proposed b-nd ts therefore queried on the fonner empht aho N a nujor nt t-lateral stnic-slip fault, the map of Greene and others (1973).

h The sub:.equent dketnery ni the comergence of the two faults unihote nonhwest of San Frantiseo further sup;vrts the idea The Palo Colorado fault w as descriNd by Trask (1926) as one that the San Gregeno and San Andreas faidts are structurally of a fainity of probable high-ant.le reserse faults that trend telatcJ. We thus reprd the San Gic;erup-llovn fault trend as ne thwest-southeast ii the nas thern Santa Lueia r ange. Faults past of the San Andre.u fault sptem. The imn'rtance of the San of this set lxally thrust Saliman gramtic basement (NLs oser Grcroriv.llevn fault trend is cudtnud by its appatent cnntrol inwer Tertiary sedunentary rM s wah di;uhp Jnplacements of of the owitten of the rucklein central Cahfoinia wast'ine (Ogure at least several hund:cd meters O rad. W24 Dwi msmt. l'iri5:

1).

Compton,1966). Mest pubthhed geolecie maps of the rep. ton B-2

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le/r, seactiff esposw e e,f the Pcto Coimde fowlt (in gulty) separating Paleor.ne (1) tw<b; dites at r;ght from granitic boiement et feft:

center.

FIGURE 3.

e highly sheoted g onNe bmementin ol.ed in the Rony Creek fowlt nonet staff is U meters; r,'ph. reto;ni,ig all (3 mete'rs high) et base of seccid af Rody Creek fewit zone.,

have shown the Palo Colorado fault terminating to the south Colorado fault either as a major strike-slip fault er as the main aEainst the east-west Willow Creek fault (G;ure 2) within the southern extension of the San Gregorio fault. Tnis conclusion granitic basement terrain of the Salinian blcck (Reiche.1937; does not imply. however, that the San Gregor o fault and the i

Dickinson,1963; Dibblee,1974). A recent basement geology high-angle reverse faults of the northern Santa Lucia Range are map by Ross (1976) alternatively shows the Palo Colorado fault unrelated. As will be seen. the San Gregorio fault is likely post-as'veerir g mere southerly to join the Coast Ridge fault zonet middle Miocene and is thus approximately synchronous with the however, this connection was inferTed solely frorn ihe distribu.

permissive Plio-Pleistocene age of the Church Creek. Palo Colo-tion of charnockitic basernent rr>:ks and was not field checked rado. and allied faults (Compton.1966). The whole family of faults is more readily understandable in the larger context of the

. by Ross.

Salinlan block and the San Andreas fault system (Graham.

De southern course of the Palo Colorado fau!r is not entical 1976a), which will be considered briefly in the final section of to the present discussion; mare im;nt. ant is the presumed conti.

th. discussion.

is nuity of the San Gregorio and Palo Co:crado faults. Sescrat obsenations make the correlation uncertain, if not untenable.

Where the Palo Cclorada fault fails as the southern extension ne connection between the two faults was inferTed in a region of the San Gregorio fault. a seemingly more viable alternative where data are poor, providing an unusual resultant geometry.

pathway catends the San Gregorio fault south from the head of Inits type area the San Gryorio fault has characteristics typical Caimel suomarine canyon into the e.>hore Sur fault zone north

ofstrike-slip faults. such as a brcad,compin urtical fault zone.

of Point Sur (figure 2). This pathway then diurges from the sur in contrast, sea chtT uposures of the Palo Colorado fault north zone as mapped when it trends otYshore again southeast of Pfeif-of Point Sur reveal a modest. meter-thick shear ione separating fer Point and ultimatelyjoins with the San Simeon-Hos;;ri fault granitic basement and upper Cretaceous or Paleocene sedimen-spn (llall,1975; Wagner,1974) along the coast fanher south tary recks (Grure 3), whieh escur in normal depositional con-(dgure 2).

tact nearby at Carmel. Ili :h-angle reserse faults commonly are

. The Sur fault zone long h.25 been recognized as a complea associated with stnke-slip fault zones, pa ticularly as splays or as connecting fault se;ments (e.g., Dickinson.1966), but the feature forming the boundary between Salinian granitie base.

Palo Co!0rado fault has been dyicted as the p.-imary estension ment on the northeast and Franciscan complex on the southwest of the San Gregorio fault and not as an audiisry fault (e p.,

(e.g.,Trask,1926). Although this key contact is primarily a reh:

Green and others,1973). Itowever, the Palo Colorado fault of underthrusting at a Mesozcie consergent con:inental margin resembles neither the San Greprio fault in its type area nor (Page 1970), the Sur wae itself also had a Neogene history of other well doeurnented sinic-slip faults hke the San Andreas activity that likely incluhd str kenlip movement in the Point fault. Morcos er,it is not more than about 50 km long, regardless Sur area (Gilbert.1971; Gilbert,1973). The actual conneetion of the Sur ron: and the Sa-Gregorio fault is not yet defined, but of which tracc is sclected es its southern catemiun.

It may in part utilire an cuamed shear Ione weli disp!a>ed in if the San Gregorio :nd Pa!o Colcrado fachs u ere contmucus, cliffs at the mouth of Re.ky Creek (6gure 2). L'nlike the contal the fault system could hau no s:rmGeant stoke 41ip component

. exposures of the Palo Cc!st:do fault, the Re:ky Creek fault is because the Palo Celorado fault, udng either mterpretation ofits a shear wne several hundred mr trs wide,incluJing numereus southern eeune, din out within the Sahman blNk without dis-shear surfaces and goure zones (Grure 3). The steep chit > of l

rupting the de;wtional patteins ef sedimentary unos (Grahant, sheared material tend toward failu e, and a manise cenerete 19764). Putthennore, the Church Creek Figh-angle reserse retaining wall ha tven ecnstnieted at the strand tme at the bre fault (fyure 0), subparalkl and neatby in the i.ortheast. enn.

of the chtTs (6 ure 3). T he R*vky Creek shear une ser.uates t

serges uth the Pala Colotada fault near the cont (Dibbhe-granitic intr um es nn the noi thes.t from a small structural bleek 1974) and is constrained to mimmal strike slip mes ement by the of Salinian eist basement on the southwest and trends into the cress-fault ewuitenee of a unque pr.ipl" ie.pyntic basement 6,,,r rene, 6 km to the southeae. (Dibblee 1974),

Unit near in sauthern end thle.14'O. Rew,1976). These data i

r.nd esidence for an altanaine sauthven otendon of the San Two piece.of evidence previd adJitional sup;urt fer the Ln Gregorio fanit, de.cuved belew, sestmngly dndlow the Palo Gregorin.Sur connection. (1) 1.e Fianciscan in the sicinity of

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CALIFORN!'A DIVISION OF MINES AND GEOLOO Griffiths.1971

Wagner,1974) hsee shown the fiosgri fault Point Sur (fi uie 4) is an unmetamnrphosed, sikit structurally'trending out to ses south of San Simeon (figure il rather than t

complea, trapacke-mudstone assembisge m *hich detriral K-cmerging onshore as the San Simeon fault (11111.1975). Hall's feMspar is present (Gdbert.1971). In contrer t Point Sur-San Simeon ophiolite-Tertiary rock offset (discussed b Francis-an -

comples in the on-land cymures in the 1.opet Nint stes nest.

below) depends on the vahdity of the latter interpretation. The by to'the south (6;ure 4) is a blueschist-facies metamorphic presurned connection lies, as is the esse with the San Gregono-sequence in w hich K-fddspars are absent f Gilbert.1971). Sinke Palo Colorado-Sur problem, near shore in shallow wster where

.-stip enosement on the San Gregorio fault utilizing the Sur zoneacoustic dats of Eood quality are difficult to otta!n. The nesr-in the Point Sur arcs readily etplains the striking Icesi contrasts perfect slignment of the prominent San Gregono and llostri Lin Francisesn facies obsened m the area. Furthermore, as dis.

fault sepnents through the San Simeon fault segment seems to Francisesn of the Point Sur us unlikely to be a chance phenomenon, even though the details

. cussed below, the unme:smorphosed

arcs apparently is othet in a nght-Isteral s<ns,e from similar.of the San Gregoric>-Ilosgri connection are uncertain. Further.

rocks far to the south, thus supporting the Sur pathwsy. (2) A more, if out offset criteris are correct, such a connection is

, small fault-bounded slice of Miocene sandstone within the Sur required.

fault sone (figures.t and 5) is composed exclusisely of Francis.

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can-derised derntus (Tre.sk.1926; Drocke 1957: Gilbert.1971; Graham,1976s). This sandstone crops out less then 2 km from

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Salinian granitic basement kno.n to be subscrially esposed C'

..44 through rnuch of Miocene time (Graham.19762), yet contains

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' no Salinian detritus. Although special circumstances could be

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invoked to exp! sin the presence of the Francivan-denved sand. [-M;s r

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,,,,.-J stone, right-laters! strike-slip on a Ss.n Gregori<>-Sur fault sys.

, ;;;..,7.9

p.,y... 5 /,.V.g tets ofTers the most convenient explanstion,

~

.d ". l's.:.;'2.p!(/ ) '../?j r-e

[.; *.'f.

?,(

2 Evidence for the course of the San Grescrio fault south ofits h ?, /'... J *f'

':'i

d..f.,' t;,j.pt,r. p.(,. - f--

> preaumed dhergence from the Sur zone othhore southeast of g<rj.

p,e,,.< v..?,*.;.yf',y"-< ";j.g'....,i.h),

Pficffer Point is circumstantis!. We infer a near-shore fault from e'

cr /

b r/ * * *.. s * * *,)*, +

,A ',::

e?'.r - / *..,.c.. Q..,i.

1;,...;.; e,f,,

..s.

,;e# ~ " r 2. 4 7,f *~. @, j PAeffer Point to the $sn Simeon ares primarily on the basis of

, the apparent on-strike sliptrnent of the San Gregonoc.nd Ifos.

g-b.

(., A.. '

.. i, 9.,a.<.n.,

n*,q.a.

y, ; ' O.e.sy.t.

')

,,, * *:f4*

g;ri faults (figure 2). Some previous investigsturs (Hostins and '

s

- y~.; p,g g.... <-y

.r.

.<r.~ ;,.

.;rm..

., ? *}.'5 t'

..,h?,% 41., f ?w;.nh '& /,@'-!M

.., y.J.*. d. /...;.. :

11 y..'L f,&;.. ;;;.;..:.:?.;.,,-nC ' ?

. c.e

• f; *.

m

... s g,.. a r

Y -7/.

. 5, f. c

T y noea ca T.-.,. J.,W ::S' ':A. -W.* ;.i

';

• s.?7 ** ';,:.*. s. ;*.}[g's*/,.*,.s*,

..".,i

/ ~oy

,u

~

(

.e

.,e h*

• Y. Y ** *. 'Y.'*.*. Y '

,E' '.'. **=l,. ?..' '* f *,**'. :,o h

. k.?

PT sunt

,o

'4

.G f,

• • '.s*l%lb bah.

k,5.a-M.!Ef r.* Y'd.y '.k',.4:;;R.C:.M.,l"r.hl

<<t A

' ! b ' 1 d

vesme: scan

.. &l$.

'~

b (n*$

e.

))

l.

n Miocent CC.ngIomercle exposedin bult gfice neGr Fo.nlSur (640 sro flGUR f.$.

p figure dl. Clops c.re endushely francinen a6mentory and igneous PFDFFf81 Pr

,, f 6

• /

Cthote.,gyes.

gau 4

"5

=h EVIDENCE FOR RIGHT-l.ATERAL ca9 It o

8 y

T STRIKE St.lP

/

l:

l '-

A family of geolope features apparently exhibits offscrin a

~

,i,n

/g s

right-lateral sense along the San Gregorio-Hosgri trend as de-I fined abose (fi;'utes 6 and 7). These of7>et pairs in:lude rock n sua.

,>4

.k;fs bodies, s.-dimentary units and inferr.ed source terranes, a pt e-San o.

o u t. 's

..u.

Gregorio fault, and a late-Cretaceous basin margin. The lat:,-r i CZ g A y=

two are linear features whme intersection with the San f

,p; Gregorio-llostri fault trend preduees picreing points frem t

i I

which, ideally, the tv.t estimates of oiYset are ubtained (Crow ell.

Ej'

..s u.,u...n m y*5 1962). Neverthelm. Neause of uneenainties inherent ion

).

y j

• ogg'u o*>*a D c<.timation of the Wund.mes or [w.indns of all of thu features,

',b of&t values are gisen in terms of ranges. Amunmg sshd stou-t;

.. e... y fault correlanons. the userlap of oil et r.mpa indica:es arrroxi.

p, e, i

(

/*y*

mately 115 km of right lateral sinke-stip on em;nne;nt fauks of the San Gretono-licyn fault trend (fig.re 7). Few,if any.

toetzer--..

of the olhes pairs oneum! Niow indisidually cem,uture umgae o.n. s.u ni,.

e...,,,,

evidente. Taken toyether, however. we feel that they Tre'ent 8 nHLut! L ' com..I e.. Son c.. coco I4,t b to, t o;nt t,, o.m. noe emn[viling nrgumrnt for mapr ny,ht.l stcral str Leahp on faults treio..futi yont oi s in f ew.uon sonJiten, he.g. e.on and me t3 of the San Grer,otio.liegrt fault tiend.

t em.p% c.cd..

a,w.

...'.. g. g,

... ~

. ~....

SAh ORLGO!LO

.tCasth.A 6.ut.

jeng Far to the north, the last on-land esposures of grar' tic base.

rnent of the Salinian block occur at BxJegs liesd ir mediately west of the San Andreas fault as it heads ofhhore (figure c).

Where the fault re-cmerges 22 km to the north, the terram u est

~

I

.so of the fault is underlain by a thick sequence of Cretsceous through Eccene sedanentary revLs compnsm; the Gustats bum l

(Wentworth.1965). He basement of the Gualais baun is not i

GUALALA KM known with certainty, but spilitic baults, possibly of Francivan 845*

,siTmity, structurally and perhaps stratigraphically underhe the oldest sediments (Wentworth,1968). If the Gusists bain is q

'O C

9 0 underlain by Franciscan complex, then a structurs1 centset between Francisesn complex and Satinian granitic b.uement ecotcA NEAO "

anslo;ous to the Pilareitos fault must e.ut between the Gus!als basin and Bod ';a }{ cad and be truncated otLhore between these PT.REYES points by the San Andreas fault (figure 6). We conclude that SFB ther,e 1wo Franciscan-granitic basement centsets may be equis s-a h/

lent and offset from es:h other in a right-Isteral sense sleng a

/

PT. StJ4 PECR0 San Gregorio-San Andress pathway (stars in figure 6).

PESC t. DERO If perfettly known, cffset fault trsees would provide piercing PiGECN PT M.

points in the San Gregario-San Andress fault plane which FAULT M

would }ield accurate estimates of the magnitudc of o@ct.(fnfer.

fat.,

I pit.anceros AEO NUEVO P T. -

tunately, both intersections lie offshore in regions of poor er non-existent data. Consequently,we prc.sent an oGet tante tiig-EEN LCYOND e-*:

ure 7) with a minimum bued on the pasitico of the Bodegs htTtt a

Head exposures (92.5 km) :.nd a maximum based on the south-y crn I'mit of exposures of the Gualsla bain (115 km).

The Gualals-Pilarcitos correlation can be tested. If the two fl EMM L#

m faults are offset equivdents. the Gualais basin sedimentary units h

are o!Tset lateral equiss!cnts of the lower Tertiary sedimentary

~

• ~ ~

rcels at Pt. San Pedro in the Sants Cruz Moimtsins (ii;ure o).

S AltNir.N /

• )e FRANCISC4NM " b t

Both sequences are deep-sea fan fa:ics nh n<-hwester!) p11:o-coNiact g;

current direcions (Wentworth,1965; Chipping.1972). A mec-c>

~

K'%

est amount of petregnphic dats are presently assilable fer thess SfM{ 54'iEM s- ( ('*

srens, but more must be obtained to test the coricistion ade-p

.s

-quately.

E ca nse .

e e

eo eo e

m-1 t.

P2-.u an ~

v t5 I

?

iM.2 1 ;!5Mr,ii /,%,mT,,.

~

ye om pr. sat s

N

-a co.auoN cu stT N

- -.. P_ _ _

_ _ Lu_ _

E I

'r.t'..M

}

~ ~ '

o,.

1. 1GUtf 6.

Mep ef geo'o;:c fecNees offset in o #l$i lo ceo' sense along

..m.

a gh, $,, g,,g,,;,_p,,gd f ault t,end. See te st f or dhevnion.

/Ql,yjf5

,. m.u,.

$g',T, -

e

e., u t "'

Bodeco/Guclete Fou!! - Pitercitos Fou!! Offset a

c) l Poir

%.ue's

'O

• l T

am.iV The Pilateitos fault (fqures I and 6) lies along the spine of f

"(20 the San Franeiwo Pemr.suls subparallel to the San Andreas LATCH ^t. PosiTicNs or carstf vi-aolNTS fauh.tiunested to the wuth by the San AnJrras fault and to the M MN GRMO. nop WT neith offshore by the 5 n Gregnn fault (medaication eiCoop.

• " 7'

"" ' '*";' 'h* '"' "S F "' d h d P ;"-

cr,190. t.ased bn later d as: K. Lajoie. Mrsens! cenununi:s-tion,1976; Graham, lu7es). The 1%reitos fault, sithourh lpng Point Rcycs Section _ Ben lomond Mounicin west of t!.c moden San AnJress f.iuli (figure 61 is the local sttuetusal bumiuy 1,:tw ee n l'ranenean compb en the Section Offsel Poir tmtthnt am i Sahr'an irr.itic b uement en the not,thned..md, De panitic bsv ment of the Point P.e,.es Penin'.ula (fi ure 6) t inut i' ceinidered to tv :.. mactne ud eut e:T trace of the Satt is Naaleted p.tinally t y creiuonal icmnants of Palexcae.md Ambe.n Lult (e r. N L.cn and Simom.19711. l'oarly espo ed more cuensne Nee,<ne vdimentasy rod s (fiu:e 8). l'he N&

so.t pity st hed four Testory roeb unconfan i.shly (?)

p ne units remptne tw o uncontbrmia-bound vomnt.ry onesie l'rancis,,.m wmple s v.uhm tt;e uruetnral t hvi bens cen the Pdirsitm ond the. an Andreas faults (ll steli,100),

p.;L.ves (Gallow ay,197o; lilaic a..J eth:rs.1974): s Miwene i

N

.B-5

CALIFORNIA DIVISION OF_ MINES AND GEOLOOY am 18L The offi.et rock bodies offer no absolute constraints on the couplet of shallow marine sandstone overisin by bssinal siliceous amount of right-slip. A minimum of 115 km is bated on the shales (Laird Sandstone and Munterey Formation)and an upper.

southern limit of Eocene rocks cropping out on the northern

- Miocene-Phocene coup!ct of shallow manne sandstone and Gank of Ben Lomond Mountain, while the most reasonable sp-d mudstone nesf7 everlying basinal mudstones (" sandstone att Drakes I;sy").The P.dcocene rocks are prim:nly conglomerate, parent value is about 120 km.

%ith Inser arnounts of sandstone and mudstone. Our observa-L tions suggest that the Palexene roeb, presened only at Point Pigeon Feint Forrnotion' ~ Santa Lucia Crcicceous

. Reyes proper, were deposited in an inner fan or channelized mid-fen en ironment (terminology of Rieci-L.uechi.1975) on Offset Poir a Paleocene deep-ses fan.This interpretation is substantiated by De upgr Cretaceous Pigeon Point Formation (Hall and a probab!: lower bathyal ( > XOO-meter water depth) forami.

others,1959) crops out extensively west of the San Gregorio niferal fauns obesined from the mudstone ( A. J. Galloway, writ, fault from San Gregorio to Ano Nuevo Point (figure 6), but is ten communication,1975).

unknown directly scress the fault to the east in the Santa Cruz The Santa Crut Mountains to the south of San Francisco are Mountains (Cummings and others,1962). De conglomerste-underlain by a relatisely complete Tentary section of rocks, but mudstone-sands tone succession is best charactenred as a regres-the southern 0:nk of the Den Lomond Mountain (figure 6) siensl/progradstional dee;ses fan-tt>-shelf sequence (Lowe.

1972). Approximately fifty paleocurrent measurements (Went-basement uplift displays an abbreviated Tertiary section (figure worth,1960. Paredes,19tO) obtained from a vanetv of turbidite 8), ne Den Lomond Mountain sectiorf includes a Paleocene

-associsted paleocurrent indicators suggest diMrsal to the unit (Lo:atelli Fctmatien) unconformably oserisin by uncon-south-southaest. Pigeon Point Formation congle:nerates, corn-formity-bound, shallow marine sandstene/bssinal mudstone mon in the channelised fan facies, contain some Salinian base-packages (Clark 1966) of midd!c Miocene (Lompico Sand-stone / Monterey Fonna: ion) and late Miocene-Pliocene age ment-derived clasts, but

• are composed principally of (Santa Margaries Sandstone / Santa Cruz Mudstone). The well-rounded clasts of seidic to intermediate compsition. van.

Paleocene Locatelli Formation contains a shallow marine fauna colored, porphyritie vo!canics (Tyler,1972). The ultims:e cear'its base, but a deep marine fsuns in its upper part (Clark, source of these vol:anic clssts, common in Coast Range Crets-

,1966; Clark,1963). We su.egist that the Point Reyes-Ben Lo-ccous and Tertiary sedimentary rocks, remains unknown.

mond Mountain sections, w.th their unusus! Paleece',e/ middle' Cretaceous sedimentary rocks are present from San Gregorio Miocene / upper Miocene-Piixene sedimentary ps:ksging, are to Alto Nueso Point, but occur nowhere else on the Salinian lateral equivalents off>et by the San Greentio fault (vs m ficure block from San Francisco to Monterey. Rocks very similar to the 6; figure 7). Cisrk (lo(3),in his thorough study of the southern Cretsecous Pigeon Point Formation in facies and composition Santa Cruz Mountains, noted the.triusi identity of the Point rest on 5ssement south of Monterey in the vici.i:y of Carmel Re>cs and Den Lemond Mountain Neogene seeriens.The spotti,/the Carme!c Formation. nowen,1965). How ever, those rocks ly prcsersed Ps!:ocene ro:is of both areas are deep-uster ma.

are Paleocene. whi'c the Piscon Point Fonnatien is entirely rine facies, al; hough xth.i;s degs:ted in diffenng submarine upper Cretaceous, based on mo!!uses we have found in the up-fan emironments. In addition, a reconnaissance study of Salitti.

permost shallow marine is:ics of Lowe (1972). Cretaceous sedi-an basement rocks by Ress (1572) revealed an abundance of mentary ro:ks do crop out a few tens of kilometers farther soutb claskite dikes in only two areas, tbe Point Reyes and Ben Lo.

of Carmel (figure 6) irrthe Point Sur (Trask.19 6) and Lucia mond Mountain areas.

(Reiche,1937) quadrangles, and then in a nearly continuous strip dotvn the Santa Lucia Range to the Trannerse Ranges (Jennings,195S; Jennings and Strand,1958).

c:wasce secries,som ru.wr De Cretaceous strata of the northern Santa Lucia Range are ec.go m c seetv.n, u een t.eveno arm e U,\\'fc~y, virtually unstudied, but abundant shallow marine (msils occur.

m,it etics uct ring lo: ally near the base of the sequence (Reiche.1937) may set uta u r q,

ace utseteev indicate that the rcels are, in part, shallow manne in origin.

T{4

{ {

~."T -

Tw enty kilometers inland along depositional stnke to the south-

~ ~ -

W g ;.-/.-

east in the upper Arroyo Seco area, upper Cretsecous sandstenes y

~

~

c'

~-

c g

g imd conglomerates, bearing evidence of southwesterly dire:ted

~ - '

i

~~ ~--

paleocurrents,likely 5 ere deposited as a submanne canyon-flu j

~ ~ ~ - -

^M f, J-p,V/,p}

{

(Rueta,1976). Apparently two ditTerent clast auembls:es

~

.,Q,,

characterize the uge:r Cretnecous conglomerates, s porphy rme

~

a

~-

volcanie. dominated suite in nonhern outcrops and a Saliman

~f ~- W-m 7

- ~,

U;[,~'

$ 77 basement dnminated suite in southern outcrops (Reiche,1937; y j E,,,

t,*M;'

;.~-v.

Ruetz,1976).

'-4 5

.?, Q.

(!

6.;.

The Pigeon Point Fermation thus may be ofr t frum the

~

se

-d "?*

?;p.?@h.~\\"

porphyritie soleanie-taring Cretaceous rNks of the nonhein

_ ' >. - l Santa Lucia Range by ntht-slip on the San Greforin fault j

c m "J j

E. h (black stem in f gua 6; fieure 7). Limited p.deNurrent and f.'.".*D') '

%*f,'j, palecensiromnental data are companble w sh such a corrdatmn.

8 In the Atre)o Seco 21:.', the merlap of Cretaereus sod s bv l'aleNene d;ep.a.ca fan depenits defmes the Ixsl northern htmt

. un eut ante csan.ns'l of the Crc:aecous bam (Ruetr,10%). T1.c hmit ef the Cr:ti-

'~~

ccous bain alag dep.sinonal suite at the cent can 1.: no ficutt s. C ea<,da.d inai rerMc une a A. roNi c,yn c..o o,,J farther south than the Calm:1 area, where PalvNene ro:Ls rest

. wi.the som IW.i t ea t.m.f %e

,a.

e B r6

19

' SAN GRF.GORIO - HOSGRI I'AULT ZONE, CALIFORNIA

.978 Point Sur Miocene Sandstone-Franciscan Source "a basement.The bnin edge could lie as f ar south as the Palo f the sandstones espu.ed where the' Terrone Offset Poir

• olorado fault (6gure -

Teniary (W. P.. Dackinson, unpub-As discussed earlier, the position of a Franciscan-derived Mi-ault intersects the e' staceous (Trask,1926; DibHec.

ocene sandstone caught within the San Gregorio-Sur fault zone 15hed dats) r:tt edge constitutes a hnear feature cast of Point Sur (figures 4 and 5) is incompanble wnh its

~

974) The Cret enate of 5an Gregnrio o!het if the immediste prnximity to Salinian basement. AtJesst 60 km of ilich would y,

.ncJ near the coast.No Paleo ene strata right-slip on the San Gregonc-11cspn fault trend is required to assin edge was tv.

tre associated win the Pi;een Point Fermanen to dc ne t e provide an adequate source terrane for the Miocene sanduone.

6 h

3ctaceous basin margin w est of the San Gregorio fault, but weThe ofTset of the sandstone cannot execed 105 km, however,

ake thi shallow manne facies espping the Pigeon Point Forma.' because it contains no volcanic clasts derwed from the tion to sij;nalimmediste protimity to a Cretaceous basin rrarrin.

Felsite as do Miocene sandstones in the Cambria area (Hall, 197 8) This maximum is less than the rninimum otT Assurr.ing that the Palo Colorado coasts! sandstones are Paleo-cene as inferred here, the Cretaceous basin margm is olTset by for certain of the off>et pairs (figure 7), but the lack of cserisp i s minirnum cf 110 km (figure 7).

poses no problem because the Miocene sandstone is in a fa

. ' Preliminary comparison cf Oligocene-Miocene rocks overly-bounded slice which likely was incorporated in the fault aone at ing the Pigeon Point Pormnion with coeval strats of the north-an intenuediate distance.

ern Santa Lucia Ran;e suppons the cross-fault Cretsceous ties.

d IJpper Oligocene-lcw er Micrene shallow-marine sandstone an interbedded basaltic seleanies at Pescadero and coesal deep-San Simeon Ophiolite-Point Sol l

tuarine mudstone at Ano huevo Pomt (6:ure 6; Clark and Ophiolite Offset Po,r t

Drabb,1977, and this volume) suggest a south-facing paleo-Ils!! (1975) reported the pro $able ofTset of a Mesozoic ophio slope. Similarly, a southsest-facin; late Oligocene-early Mio.

j.te and overlying distinctive Tenlary sequence from Point Sal cer,e palcoslope (not shown m figure 6),is documented for the to the San Simeon area along the San Simeon-Hosgri segment i

> northern Santa Luesa Range (Graham,19762.b). In addition

• of the then unrecognized Istger San Gregorio-Hos;n fault trend restoration of 11$ tm of right-slip places the Pescadero basalts (double underlines in 6gure 6). Hall claimed a minimum of 80 on prc9ection from a trend of upper Ofi;ocene-lower Miceene km of otTset, but in reexamining local relations we suggest a M:)

,b: modal volcarnes (e.g., Ernst and Hall,1974; Grah,am,19 minimum of S5 im from the nonh end of San Simeon outcrops 1

cropping out seuth of and para'!el to the Cretaceous outcrop to the littdt of curetops at Point San Luis. An offset value of 110 band,in the Santa lucta R2:f,e at the southwest margin of the km is gained from the center of the outcrop pattern west of th Sahman L!oek (figure 6)-

fault to the center of the outcrops east of the fault (figure 7).

n Offset of Offshore Gravity P,idge Silver (1974) proposed that an offshore linear gravity "high" TIMING OF MOVEMENT j

. f us offset 90 km by right-lateral sinke-slip on the San GregonoGeologic relations indicate that the nffset cf the Point Sal-San fault.De southern flank of the feature comes ashore near Aso Simeon ophiolite-T-rtiary sequence by the Hosgri fault n; ment Nuevo Point w est cf the fault and was suggested to be otTset from

1. mplished 5-D million years ago (Ha!h 1975). Most of the edge of Salmian basemen: maried by the Sur fault v.here it

' *5.* 'd.the in icators on the San Gregono segmer.t merely indicate a trends off hore r.enh of Point Sur. Remeasunng the indi:sted n acesms age, but two dut pain an men smeme. me

~ offtet to the edge of Salinian buement soutn of Point Sur, we,

P*~.

fault shee of Mic.:ene sandstone near Pomt Sur contam sur. gest a range of 105 to 130 km (6gure 7) for S i1 y e r ' S ostre,r titan nN!!an (Trask.,1926; Grah;.m.19762). Although ranging threut out the Miceene, this molluse is most tyrt:al of 0%et, h

joy,.,, y;c,cene sitata in the cambria area (Hath 1974L We thus Po, int Sur Frcnc.iscon - Cambr,ia P,tnes infer that major right-slip invohing the sandstone is probably post-lower Mio:ene. The Point Rc,es-Den Lomond Mounta Slob Offsot Poir o:Tset pair rebes on similar middle Miocene and upper Mwene-A cross-fault contrast m metamerphic fac.ies m the Francis-Pliccene sections. lf valid, this eorrelation imphes that right-slip can complex unes to defme the probable course of the Sm inay hoe commenced by at least' late Miecene time, and th-Gregorio fault r. jar Pomt Set (6;ute 4) From the Pomt Legzsub-upper Miccer.e unconfonnity could retleet this event. A late sres south, the I raneacan comples contains eatenshe mdiangeMiocene or een'enati e post-middle Micce.c are for the initia.

d penerally is umts, o, metamorghesed to ur)ing, depces, an Usu, 1969h tion of sti ke-shpis compatible with the timing suri.esteJ for the i

dnoid of detotal K-feld' par (Gilben,1971:

floweser, an tmmetamorphmi K-(eldipar-teating Franesscan H

i se ment.

r.ra>waele sequence h es;wd near Cambna (Halh 1974b and At 6 cm/yr, the rate of movemerd on the modern San Andreas vic surgen that ths Cambiu Pineolab (thu, le 9) is the offsetfault (e.r.., Dickinson and others,1972), the entire 115 km of c

squhairnt almg the San Gregons.lleyn trend of the un-indicated right 4p could be aceomphshed in less dian 2 rnilhen inctamorphosed K-fdJsrar-beanng franciscan cemples at yeart At le.nl moJest llohv;ene maement on elcments of the Under hhes in fyure o). Matching San GiernwHxrn fault trend is indicated by the toest thruu.

Peint Sur (fh pres 4 and m+:

the north eint of the Cambru Pmes slab woh the north end of ing of Min;cne reet s cier terrase de;wis.,: Mo N'ueso Pamt Ibc Point but t hi pen a nummum effset of 105 km. The (Chut,1970 WcNr and Lajoie.1977), by probable s&ts of southern end of the C.m.tou PmcS slab muo be under Nern the sea Thur tw.dly (Griene and ethers.1973; W yner,1914),

lby,liwd on the t6imd sheribubon vf Fianchean htholog:es md l.) wnmiaty (Gawil.rup. Pt??). !!oacier, the majnr !< nod (llw,19@; llath 1973), thus utting the pie. bane up;<r hmit of moscment may v. ell have tven cather.

sofoffvtat105Lin.-

n+,

CALIFORNIA DIVISION UF Miw nu A i'. '

~

o 20 i

r-4, THE ROLE OF THE SAN GREGORIO-V4x.1

>z

.ico,m HOSGRI FAULT TREND IN

,xswr h* 1r>CNN Uuir o8 4 uu= =~ car g

THE SAN ANDREAS FAULT SYSTEM

\\ n i

g The assumption of approsimately 115 km of post-middle Mi-p

} oeene right-lateral strike-dir on faults of a San Gregono-lios.

j!

gd fault trend connecting with the San Andreas fault implies E

-0.

that the total o(Tset of Salinian basement by the San Andreas 1

faolt is only an apparent number integrating the ofTsets of both i

the San Gregnrio and the San Andreas faults, De minimum total offet (510 km) is based on the nonhernmost on-land exposures of Sa!;nian basement at Dodega licad (figure 9), w hile

,l r

y a masimum estimate (6rA km) usumes granitic basement otT-j o

shore to near Point Arena (Siber and others,1971). Deducting 8

115 km of San Gregere Itoscri right -shp from the 600/510 km aS5/395

)

a maximum / minimum on the San Andreas total leases

[

km tnaaimum/ minimum cf right-slip on the San Andreas fault e

rone sensa strient (figure 9). Post-Oligocene (" modern") San

..." ^ * -

Andreas right-slip, all based on cross-fault ties south of the San y

A gfgg.cy-4)

Tected by it, Gregorio-San Andreas juncture and thus una:

,t

/J.

s4n Accas sc.twrr amounts to approximately 310 km (Dickinson and others,1972t I}

Mattbews,1976). Consequently, since no rnajor right-slip faults

-[

,,g 8

ma other than the San Grc;ono ifosgri trend are known to interseet E

I t

the San Andreas fault :one, the ddTerence between the true San Nb

' verleen uvrr er saum I

u4x.

Andreas basement o:Tset (having removed the San Gregorio-y5$EQ5Q7QQ

)lcstri component) and the rest-Cligxene San Andreas right-E y

+:ncutar slip inust be a measure of nght-shp on a pre-Oli; cone protc>-

j San Andress fault roughly coincident in central Califomia with' Q..g{,%

se:ss st.c p<ioro sM AffRCAs f

tis tra:e of the modern" San Aadreas fault zene (figurc 9).

(

Proto-San Andreas right-slip thus amounts to 175/S5 km max-f 075CT-j imurn/ minimum.

! mecAett u6ur er De timing of movement on such a proto. San Andreas fault ps$ DAN &AsEMENT has been discuoed chewhere (e.g, Di:Linson and others.1972:

Nilsen and Link 1975), but it must cenainly be pre Eo:ene to

( Al Restoration of taeog-ne,:sSt-irp en the 5cn And.eoi foult ricuC 9.

honor the Durano-Point of Rocks cross fault ne (Clark and i

Nilsen,1973). An intra Paleocene are is su;;ested by uncon-

.i,yna g3,n,w wnareoi rewi pwi son o,esenc>-seir; foa I

formab!: relations in nearby areas (Graham,1976a. b). Si lnifi-

,,,nd, r.,no;n;eg ati,ue g cnti;c des m n,,,,, one

,,g t., ey r,.

l ci n;ht slip on the San gene son Andreas osd son on godo-Hosg6,;shi-in, mey be o moi.

cantly, howeser, cunsideration use of etsht-si;p on a polo-Son Andreas lovlf.

C egorio llos;ri fault trend reduced by at least a third and i

peihaps by two-thirds the apparent ogh 41ip on the proto Sanand Molnar,1973). Within the limits of uncertainty inbrent in Andreas fault were the San Gre;eno liogn trend not consid-both curves.it is apparent that most movement be: ween the two l.

pistes h. been accomplished solely by the San AnJren Quh for ned. Funyrmore,if Sierran basement east os the San Andreas u

ween that ome and the early fault underbes Teniary b2 sin fi!! (queried, dotted line in figure pleau We mix mdhon ycari..Da'but most.cf the p!ste rnetion

9) northwest ofi:s outerep !imit.and if Bede;a llead west of the hiiocene. the ts.o curves difer'ge.'

fauk ts close to the nonhsrn hmit oi Sahntan basement, restors' can be distributed between the SarrAn'dreas and San Gregori:>-

tion of becgene San Gregorio liospriar.d San Andreas n;ht shp 11osgri faults. The latter is r robably best regarded as e.n o:T>hore secounts for all baument separatmn. In these cureme condi-strand of the former, and s such, probabiy absorbed a large bons, a proto San Andreas fauh coincident with the modern San proportion of the relathe motion between the Pacme and Nonh

, Andreas fauh m central Califonna is unhout sgrort.

American plates prior to PUocene time.

The right-shp history of the San Andreas fauh h conveniently These data thus constirote a compromise between two estreme h (ugure 10),

iews of the esolutien of the San Andreas facit: a twestage displayed m a time-setsubdisplacement trat W#~

• Cune A, rigure 10,is the San Andreas fault tune,hspbecment I " * "" ^"d'##5

'"'Y bE' $"II'*

• • U curve of thekmen and others (1972) and Nd>en and Link s.taic history un elvin t, h.eer :nc >h.emg and extensien of Sahnun Mio:ene-Phorenc basement via the San Andirai. fauh and a system of alhal taphs (1975). mo.hfied in seeordance wuh a toundary near 5 M Y,ll.P. (see Graham,1976a for further (khnson and 5orm:ut.1*!74). Out (enuderanon of the Sa discusdon). The cune clea:b shou 5 the two tage nature of the Gre@hrn, fach tjend indicates that there w as an eptu de j

f bhtory of the S:n Andros fauh.The detted mcdMeatian of the I I'#* *

"^"#'""M' l' "

C kn Anac.n cunc poor to e0 M Y 11 P. icprevnts the etleet of cu than presub >upyd. 'In addition, heweser, tL, yn dkreprWng. San Gregno !!oyn neht-shp. whde the sohd Andreas fauh clearly a the inajor component m a latter b,.o-geqe W m aa O n ren Lush sWem of u Mi & W h l

cun e condJers San Gref ono-flesgn nyht-ap and hence is the "bue" Sw Andre.n tiine-dnplacement cune.

gnno lhyn f.iult tiend r, a part. 't he prohbSan An lteM J

)

rir.ht sHp rpiwJe inay h.n e entaded an estenske f.wh @m Cune 11, l'irute 10, terrevnts the hhtery of rebthe inove-at alogous to the Neogene un Anheas sptem, n sui;nted I-y

. Intnt b:tnren the Pmfic and Nonh Amnican plain (Atw. ster I

E -3.

,, ^

l s

~

w-,

SAN GREGORI.O - 11050R1 FAULT ZONE, CALWORMA 1978 f

P-Pl Mi0CENE IOUGOCENE i EOCENE I PALEO. I CRETACEOUS g.

goo..-

a.e PActFIC.N. AMERICAN PL ATES E>

TWATCn 8 MOLN AR, l973) goo 1

y n

u 3: 700 to

--,.....j.

n.,,

)

n

{ GCO PROTO-SAN ANDREAS. (MIN jSCCEGM JE MOVEMENT ON MOVEMENT (M AXJ urxs

,[OTHER FAULTS DISREGAROLNG MIN F:CCCCM w

b o Soo g""-' POTENTI AL CUMUL ATIVE SAN GREGORIO

/

[-

OtSPLACEMENT lq ff.. g 9 400 SAN ANDREAS-SAN GREGORIO u

u g

t O

.h s

i I M*r S AN ' ANDREAS FAULT

/

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303 PnOTO-SAN ANDRE AS i

MOVEMENT (YAX.)

200 S AN GREGORIO CONSIDERING ACTIVITY SAN GREGORIO FAULT

-f 100 t

f f

f f

f I

[

10 20 30 40

_O 60

, 70 EO AGE (MYBP) lime-off set curves. ( Al Son Andreas Iowlt curve (DicUnson and others,1972: Nilsen and tirik,1 keyndoey at obout SMYB' and to dhp?oy the effect of Son Gregorio-Hosgri fodt scoe right-s%

flCURE 10.

p!otes. See test for d;ievsison.

ACknOvdedgments the early Tertiary continenta.1 borderhtnd con 5guration (Nilsen r.nd Chrke.1975), but the deuils of such a system remsin.

tmcert. sin.The proto. San Andre:.s (sult sy stern possibly was theOur re aarch was supported in part by the Eanh Science structural resolu tion cr eatly Tertiary ob!que subduction, rather Section, National Science Foundation, NSF Grant D E.5 than a transform fault spiem hie the modem San Andreas fault 72017 3.Megafossilidentincations were presided by W.O. Ad.

system. This inictence is comptibit.vith reconstruct:oas show.dicott. Chevron U.SA. asdsted in preparation of the manus.

Ing ble Cretaceous-early Teni.iry oblique convergence h: tweeneript.

the TaraUon and North American plates (Coney, in press),

a

'. *l *

. REFERENCES CITED Bronner, J.C., Nemom, JJ. oncf Arnold, Rofph,1907, Oescription of f e l

'=

Atwater,T ond Metner, P., It*\\ te!cf.ve enetton of the Pocific o id North Sordo Crus quadrongte: U.S. Geological Survey GeoWcol Alfos, f oSo Americon plotei dedeced from neo-f;oor spreading in the At! antic, In.

163,11 p.

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Cotfornio,40 p.

Slob, M C., h, tomw, J.A., feis ts R, Y. A.. J... Schlock er J., Song. Dennis, CMpp%, D.H.,19??. Sed:r:.ectory structures and ea :ronternt of some '%i Went.onh, C.M., and W6ht, t.R.177J, hel.maory cierog:e mop of senditone Leds of sv4;d te type. Jovinot of Se(ne nto y PetroWy, e, porin o.sd Sun f #anc;ue CevMies on,, poru of Alameda. Ccano Costo, 42,no.3.P.587-5756 and Sonomo CovM4 s. CuMoan;o: U.S. Geolog col Survey MMellaneous' fiefd 5%d et Map MM74.

.Clork, J.C.,1966, Ten;oey shotMeophy of tbc f etton-Soma Cnit oreo. SeMa uo;ns. Coi;f = n;u. 6 h D.,ihe. $sont o,d UnNe,Jty, Stanford, Ceve uov

' to.<en, O.L.1965. !t,a g oph, i vct..ee end o;l r.ou;b.f.i;ei in Monte,e y r

y t s

cot,8o,nio,179 p, and So'enoi OvMeunfe n'. CoMo'n o. At'eticon Astotiot.on of Pe t'e tum C< dog;iti, f otd.c 5cc6ca, oevol mee6mg. $ r'*Po'ivm of pvpers, p.

192. Coeietot;on of the Lonto Cev Mnuntains focore -imo co vas n n

~

M.

Ina Son Andecus h.uce r. a. O.sMainn, W.R., cad Geor u. Arthve. e pen.

hoceed.eci c.f the icate eac e im s 9%c s. d'emi ci " e Son N.cos Irsbb, ( f.,19/0, hernJncey ceofe.pc nep ci the centrat Somn Cra pe % 5:etveJ L1<.ne us y Pvt,lgon.coi, Ce dn< ol Sc.cece, v. I1 10 11 ty MovMoine,' Cut.f o n.m O 5 G,o% c of Sv ve y, f ai;c Do<a Ceau.but.on e

p. 166-lf.U.

6, Son Tenacius (ivy 6 e 3.an (n, sona.ent oad te sovec es Oban ng Study.

. a. 9 e

~~^~'"-w

+-,s_, _,, _ _ __ _ _

~-

Chimsn.ua m'~~-

22 Grahe,n, SA,1976o, Tercory sedimentary tectanici si iA, ceevest Sol;nien 1970, Geologic mop of the sterh-estern Stata Crwa Msunte:as blod of Cof;fornia: Ph D. ihesis, 5tsafoed Un.vsrsity, Stenfo.d Cof.for.

betwna AAo Nuevo Po;nt and Dovenport, Col.lom.oi U.S. Geological j

edo,510 p.

Svevey opevf;te map,

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Cloik, 5 H., Jr., and N;! ea, T.H.,1973. 0:

• Irnpfket;ons for the kiitory of off set a ong the Son Andreas lowh, centrol and earthquakes in the Monterey Boy region, Col;forn o:U.S C otogkoi l

snd parthem Cai, fora o. in Ko och, R L, and Nur, Arnos, ed. tors, Pro-Svevey basic Doto Contribunon 58, Son Francisco Boy ieg;en (nmon.

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j

• lW367, Ho!!, CA. Jr.,1973, Geofogic map of the Morro soy South oad Port $ca

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Czmptsa, R.,1966, Anofyses of Pf;ocene Phistocene deformotion andSurvey Misselloneown field Studies Map MF-511, stresias in northern Soaro tudo Honge, Ccfiloraio: Geolog;<ol Sodery of

,, Americo CvfWrin, v 77, no.12, p.1361-1380,

• • MSN '"" d

• b"b* '* 9b"' b M N

• G""T' Cecey, P.J.,la preis, Meioso;c d"enosoic Cord.rteron prove tectonine Geo. Cotif orn;o: U.S. Geolog.ical Svney M..sceltoneon Field Stud:es Map MF-logical Socirey of Arrericcr Speciot Popen 5?9, aneodoign feuh systm, coastal CWornb conWe Coopee, A4,1973. Streets e of the continentet shelf west of So.s franclicoiond environmento!in pricof;onn Science, v.190, no. 4221, p.1291-1294.

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r U.S. Geofogical Suney 0;qn. file Report, Cio-ett, J.,1962, Oisp?cceaient elong the Son And.cos fou!t, Cofifomto:

Ho!!, CA, Jr., Jones, D.L. and Brooks, S.A.,1959. Pigeon Po:nt formorien Geo!agkol Sodsty c,f Americo $pecial Peper 71,61 p.

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Comm:ngs, J.C Touring.t.M.cnd Brobb.f.E,1962, Geofogy of the northem 2859..

ntains, Co:Iom;o, in i,o-en, O.E., Jr., e d. tor, C e ofog;coi j

Santo Crvs Mou j

gv'de to the gos and oil f.eth of northeen Cel.'emio: CoLfornio DMs;on Hill. RL, and Dibblee, T.W Jr.,1953, Son Andreos, Gortod oad 8;g De sf Mines and Geo'ogy Ev :etin 181, p.179-220.

foults, Coldorn;o--a study cf the ch stoc'er, history, and tectonic i;gnifi.

conce c.I their 4;splacernentu Geolog. col Society of Americo 8viter;n, v.

Dibbtu, T.W., Jr.,1974. Geo'ogk mens of seven 15-minute quadrongfes, 64, p. 443-458.

Cof; feen;o, U.S. Gedog:c:t Suney open-fire mers.

Heikins, E.G., and Grif fiths, J.p.,1971, Hydrocorbon potentief of nortf em J

Didicion, W.1t.,1965. tert;ory strot; graphy of the Cbvech Creek creo, Mon.

and cential Cobfornio of f shore. in Crom, l.H., edaer. Future retrofevm terey Covaty. Col.f om;o. in Short conir bvrions to Co'.forrJo geotegy, pro'inces of the United States - their geology and potentiof:

Amer; con Cordonni-Di<is;cn c' Mine* and Geo'ogy $redel Report 86, p. 2544.

Associo6cn of Petroleum Geologists Memoir 15, p. 212 223.

1966, Structv.of tefet:c.nihi;is of Son Andreas fault system. Chotome Hsu, K.J.,1969, Prelim:nory report and geologk guide to Frondscon end-Geolog. col Society of Yo"ey ond Cost'e Mosato,n Konge, Cotiforn;o 3,,,,, og g, go,,, g,y,$,n $;m,,, or,,, ce ;g o,nio: Cordom;o Di.is;on i

Arnerko Svile tin, v. 77, rio. 7, p. 707-726.

of Mines and Geofogy Speciol Pubt; cot.on 35, p. 42.

Cowan, D.S., and Sch-eMert, W.A.,1972, Test of new Did'nson, W.R global tects.n:cs-dicvis;on. Americon Assoc;ot.on of Petrofeum Geolo.

Jenn;ngs, C.W.,1958, Son tvis Obispo shet, Geo og*c mep of Ccforea r

y

$'nts t of'st;n, e, 56, no. 2, p. 375-354 (0 of P. Jenkins edition) Cot;fornia Divis;on of Mines - 1:250,DM.

Dohren=end, J C.,1971, Mcdne geckgy of t' e contineatof s uif bet-un Jenn;ngs.C.W., and Ev cett, J L,1961,$on Froncisco sheet, Geofogk reop t

• ~

a Point Lebos od f'oiat Sve. Cct.fortno. o reconno.isonces M.S. thesis.

of Cofif omio (Oloi P. JenUns editionb Cotifornie Civisica of Mines -

Stanf oed Un:<ertiry, Stanford. Codor Jo, to p.

a 1050.000,

.I tenit, W.G., and Hct. C A., Jr.,1974, C e o!cg r or d Pe teolog r of ihe Combrio Jenn;^gs, C.W., and stroad, t.G.,1950, Santa Crus sheet. Geefogk mop 0;. goc eae f ormonon, = cit-<entrol CoGf ornio Cooit of Caldernio (Olof P. JenUns edit;on), Col.forn;o Di ;iion el M.aes -

reti;te, a new tonpe s: Geclo;;c ol soc;e ry of Arne6co 6v!;e t.n. v. 85, co. 4, p. 52}-532.

r 1a50,000.

. Go*.o-cy, A.J.,1977 C eoldc nior of Po;nt R epi Pen;nn10. Moda Coenry, nion.10.*, and mone4, W.R.,1974. Ne oo,*e tectoak evotu ion of the r

J Cs!.fodo. Coblora.o Dmi.on of Mian and Geologr Metin 202, p. 4.

\\

Sot;n;on btxk, weit.centrol Co5f ornier Geofogy, v. 2, no.1, p.11-16.

Go.thmp, W.tt,,1977, Selim:csy of seateof socitof (cme nia. Geo:ogkol towe, D.R.,1972, Submodne s oaron cad i ace eksnnelied:meato :en ndel r

f Sode ty el Aniedco Abit.oc ts mii5 f ro womi, i. 9, no. 4. p. 422.

os inf erred iram vprer Cee hceovi denos,ts,

• eitem CoMyn.b. N "ed.

ad GeoWe Cengeni,24t's, in6on A p. M ngs o 6e Intemco Gl'Lett, W.G.,1971, Svr f oolt n one, Moateecy C uary, cot.f orn'ai Ph.D.

Conetodon of Nnades cad t4eenoch Yr.'coak the s;i, Sier.f oid unhe si.ty, Sionf o J. Co;.f o<n.o, t 3 p.

Mollhe ws, Viec e al,111,1976 A ra erw f ormot.c.at ca<f t'.eir t.Mn y on the Son And cos f owlt pecU rm M 73,feonc; icon ecd s near Svr fowlt none, horthern Santo tudo 8 ca; e, (c.th<e.a Ge n', g. sol So6s ry a,f A.ne nco 6 Jet.n, v. 6 d, no.10,

, son Aimdobon vf Fei.clewm Ge oin.its EJenn, v. to, no.12, p. 21 2141.

p 2Jt7 3]?d.

a:csin the N.f.e n,7 it. ead Cimt e. S it, Jr,197 5. 5,d.mene.v;on e-d vecte Gim. W It '", f %eie nc c.ntt to-se New s a+ et e e *e vien poet of it e s mf y larhury ivro.ne e ed Loe Jee6J of ce r.I,d Col.f c.a.o: U 5. C. 4

$nn f e w d co l'e a. cob Va..eu.tr et Co'.toea.o f%U.uons in et e Gen. sot Sun ey flof ci6 cad h.rs.ee YL's. 64 p, f

a bphe t M cie s, v, M, r o. 2, p.14 7-1M

. B - 1.0

~

' SAN OREGORIO - HO5GRI FAULT ZOMi, L.Aurw,urs.

1978 Silver, E.A.,1974, Struc w.ot inte pretot;on from free.oir groeity en the e

Nitees, T.H, sad Link, M.H.,1975, Suetigropl y, W4;aentofogy ond off set Cot.f 6anto coa 6aental me, sin,35' to 40'% Geologico! Society of Amen.

along the Son Andesos foJe of Coceae to in.er Miocerie stroso of #be h

. co Abstiocts with Progroms, v. 6, no. 3. p 253.

porthern Loaio Luceo f o.ge cad the Son frWgd.o Moware.as. Coc Ranges, centrol Col.fo,as Soc.ety of (cono,nic Pa eontorog ses oad Suppe, J.,1970, Offset of late Mesozoic boiement terroaes by r

Ae San 367 400.

Enessfogists. Pocif.c Secnon, Paleogeae Syrnposiva, p.

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. Trosk, P.D.,1926, Geology of Po nt Sur quadronfe, Confomici Un;.ersity Jewmol af Geotog; col 59evey ie search, e.1. no. 4. p.

of Conf orn.o, Deportmene of Ceological Sc:ance 6vf et;n. v.13, no. 5, p.

'3N 32.

I30*I70 Pege,8.M.,1970. Sve.Nocimiento lovlt none of Cof:fornio - cont'nental

esosgin sectonics Ge olog; col Socle ey of America tvUeI;n, e. $1, no. 3, p.

Tyler, J.H.,1972, Pigeon Po;nt Formot;oni An upoer Cre oceou v

succendon, centrol Coblomio const: Jovenol of Sedimentory Petrology, v.

. 667 a 42, no. 3. P. 537 557.

Freedes. M.,1940. Si;dcoa< e of the sed;mentory strucevres of the PigeonWogner, H.C.,1974, Morine geology between cope Son Martin ond Point P4at f orrast;on beNeen Ps scade.o and 8 eon Hoitow 6eoch, Cofifornion

- 5tudent report, Lionford Uni..isity, 5'onfo<d. Confernia.

Sol. novth-centrol Couforn.o of fshoro U.S. Geologico! Swney Open.%

Report,17 p.

te;che, P.,1937, Ceology of the lucio quadrongfe, Co5femio. Unleersity ofWeber,0.5.,197J. Hofocene inovament on the son Gregorio f ault soae aeor Cet.forn:o Pwbucotloas. Department of Geolog: col science Bulletin, v.24 oteo Cowaty, Californici Gedog; cot Society of Arneri.

m AAo Nuevo, Son 1

eo. 7 P'.115.f 65.

co Abstrocts with Progroms, v. 6, no. 3, p. 273 274.

)

f

. Ec4Mveshi, F.,1975, Depositicaof cycle "a No turbidife formations o Weber, G.f., and lejoie, tLR.,1977 tcte Pleistocene and Holocene tecton-northern Appenines (Italy)yJostnot of Sed;mentory Petectogy, v. 45.no.

ics of the Son Gregorio fowlt zone between Mon Geoch and Po;nt Aho

)

Nuevo, Son Moreo County, Co!if orn:oi Student report, Stanford IJai.cr.

1, P. 3-41

' toit.D.C.,1972, Pchog oph'c onJ chemical reconnoissoace of some gronis;c

,;,7, st,nro,d, CoGiornia.

ond geeinic rods near the Son Andreas fowlt hom Bodego Head to

. Colon f ois, Cot;fornio U.S. Geological brvey Profeuional Paper 698,.e-1968, Upper Cretaceous oad lower Tertiory ifrafo near Cuofolo. Cof;.

fornio, and iaferred large right.st;p on the Son And<aos fowlt, in Cidin.

92 P.

son, W.R., and Grants, Ar.hwr, editors, Proceedings of the conference on Stonford University 1976 Reconao'ssonce geologic mop of pre-CenotoIC'Dolemenodle geologic p,cblems of the Son Andreas fault spfem:

sorthem Soa*o twcio neage, Monterey Cesary, Co5fornier U.S. Geologi.

Publications, Geolog; col Science, v. It, p.13&l43.

. co! $wrvey Miscellaneove Me:d Stud;es Map M.f.750.

Wiebe, R.A.,1970, Pre. Cenozoic tectonic history of the Sof;nton Llod, western CoGlor'io; Ceclogical Sedety of Americo Swiferin, v. 81, no, o, n

twett, J.W.,1976, Paleocene sedimentation in the northern sento Lucia p.1837-if.42.

j

. tonge M.S. thesis. Stonford Uni.ersity, Stanfoed, Cotifornia.

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m UNITED STATES OF AMERICA

, y, NUCLEAR REGULATORY COMMISS];ON'

.v g lj $ k d g yh

-Before_The Atomic Safety & Licenh 9

p r

In The Matter Of:

)

N

)

co PACIFIC GAS & ELECJRIC COMPANY

)

Docket Nos. 50-275 OL (Diablo Canyon Nuclear Power

)

50-323 OL

. Plant, Units 1 & 2)

)

4

• CERTIFICATE OF SERVICE I hereby certify that I have this 21st day of Noyember,,

j 1978 served copies of the foregoing TESTIMONY OF THE JOINT INTERVENORS - STEPHAN ALAN GRAHAM upon all of the parties listed below by' depositing copies thereof in the U.S.

Mails, first-class,' postage prepaid.

Elizabeth S.

Bowers, Esq.

Dr. William E. Martin Chairman Battelle Memorial Instituto Atomic Safety & Licensing CoJumbus, Ohio 43201 Daard Panel U.S. Muclear Regulatory '

• James R.

Tourtellotte, Esq.

Commission

. L.

Dow Davis, Esq.

Mail Drop Ea'st West 450 Richard Goddard, Esq.

Washington, D.C.

20555 Lawrence Brenner, Esq.

Office of Executive Mr..Glenn Bright

. Legal Director

. Atomic Safety & Licensing DETH 042 Doard Panel.

U.S.

Nuclear Regulatory U.S.

Nuclear Regulatory Commission

• Commission

.*l Washington, D.C.

20555 Mail Drop East Hest 450 Washington, D.C.

20555 Mrs. Elizabeth Apfelberg 1415'Cozadero

. Docket & Service Section San Luis Obispo, CA 93401 Office of the. Secretary U.S.

Nuclear Regulatory Mr. Frederick Eisslcr

. Commission Scenic Shoreline Preserva-

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Washington, D.C.

20555 tion Conference, Inc.

4G23 More Mesa Drive Santa Barbara, CA 93105 G

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2.

Sandra A.. & Gordori Silver Arthur C. Gehr, Esq.-

1792 Conejo Avenue Snell & Wilmer

i San Luis Obispo, CA 93401 3100 Valley Center Phoenix, Arizona 85073

. John Phillips, Esq.

3 Center For Law In The

• Bruce Norton Esq.

Public. Interest 3216.N. Third Street 10203 Santa Monica Boulevard Suite 202 Los Angeles, CA 90067-Phoenix, Arizona 85012

-Paul C.

Valentine, Esq.

Mr. Yale ~I.

Jones, Esq.

321 Lytton' Avenue 100 Van Ness Avenue Palo Alto, CA 94302 19th Floor San Francisco, CA 94102 Janice E.

Kerr, Esq.

Mrs. Raye Fleming Lawrence Q. Garcia, Esq.

J.

Calvin Simpson, Esq.

1920 Mattie Road California Public Utilities Shel1~ Beach, CA 93449 Commission

~

5246 State. Building MHB Technical Associatec 350 McAllister Street 366 California Avenue San' Francisco, CA 94102.

Suite 6

' Palo Alto, CA 94306

• John' C.

Morrissey, Esq.

Philip A.

Crane, Esq.

Carl Neiburger James O.

Schuyler, Nuclear Telegram Tribune Projects Engineer P.O. Box 112

' Pacific Gas'& Electric Company San Luis Obispo, CA 93402 77 Beale Street, Room 3127 San Francisco, CA 94106 Copies hand delivered following Graham's deposition on 11/21/78.

'hf.L{A.&{ klLL{ Watt David S.

Flcischaker, Esq.

1025 Fifteenth Street, N.W.

Suite 602 Washington, D.C.

20005 n

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