U.S. DEPARTMENT OF THE INTERIOR BULLETIN 1995-AA U.S. GEOLOGICAL SURVEY Plate 1 122° 120° 36’ 30’ 121° 30’ 36’ Jolon Fault (Burch, 1971; Buchanan-Banks and others, 1979) U D (Espinosa Segment) Na c imi e n to F Search au lt Z one (J e n ni n g s, 1958 U D Bu San Andreas Fault (Jennings, 1959; Dibblee, 1973) rc U h D , 1 9 San Simeon Fault Zone 7 1 U D ; D U B ucha n an- Ba n ks (San Marcos Segment) a n d o th ers , 1 U D 979 Oceanic Fault (Hall, 1974; Hall and Prior, 1975; Hall and others, 1979) ) U ? D ? D U U D Cambria Fault (Hall and Prior, 1975; Hall and others, 1979) U D U U D Piedras D Blancas Anticlinoruim S a U D n San Juan Fault (Dibblee, 1973) U D t a L u 30’ c D 30’ i U U a D D U B U D U D a n Rinconada Fault (Dibblee, 1973, 1976; Durham, 1974; k D D U U D D F U U D U a u l t D U U D ( Buchanan-Banks and others, 1979) M U D U D c U D D U C u l l D Rinconada Segment o U c D U h , H 1 9 o U D 8 s U D 7 g D , r U Cambrian Fault 1 i 9 8 D D U 9 U U ; D PG F a D U D & u U l E t D U U D La Panza Fault (Dibblee, 1973) 1 U 9 D 9 D Z U 0 U ) o D n e D U U Los Osos Fault Zone D Edna Fault U U D D West Huasna Fault (Hall and Corbato, 1967; Hall, 1973, 1979; Buchanan-Banks and others, 1979) U D Pismo East Huasna Fault (Hall and Corbato, 1967; Buchanan-Banks and others, 1979) D U U D U D South Cuyama Fault Syncline Indian Knob San Miguelito Fault U Olson D D U U D D Fault U (Nacimiento Segment) U Pismo Fault (Hall, 1973) U D D U D San Luis (Dibble, 1973) Bay Fault U U D D D U D U U U D D U D Wi U D U Pecho Fault l U m D D U ar D Av en D U U u D U D e Fa D U u D U l U Oceano t D U D U D U U U D D D Santa Maria River Fault (Hall, 1978) U D U U D U D D D U D U Fault D U D U U D U 35’ D U U D 35’ D U D D U U D D U D U U D D D U U Queenie D D U U D D U U U D (Clark and others, 1991) D U U D Structure Bradley Canyon Fault U D U D U U D Casmalia Fault Zone (Gray, 1980) D U U D D U (Worts, 1951) U D D U Purisma D U U U D D D U D U D (Sylvester and Darrow, 1979; Hall, 1981; U U D D Buchanan-Banks and others, 1979) D U U Foxen Canyon Fault Lompoc U U D U Santa Lucia Bank Fault D D D U L D ion U ’s Structure D H D U e Structure D a U U d D U F U D D U au D D lt D U U U ( Garey Fault (Hall, 1961) D D U D D S (California Division of U U y l v Oil and Gas, 1974) e D s U t e (Sylvester and Darrow, 1979; Hall, r D a 1981; Buchanan-BanksLittle Pine andFault others, D U U n D U d U D U D U D D U a U D D r D U ro U D w U 1979) D , U D 1 U 9 D U D D 7 U 9 U D ) D U U D U U D D U U D D (McCulloch, 1987, U D U D U D U D U U D D U U D U D D U U D D U a U D Buch nan 1989; -B U a D U n D Santa Ynez River Fault (Sylvester and Darrow, 1979; ks U a D nd , U ow U D D arr U r and D D U te ) U D s 9 PG&E, lve 7 o D F (Sy 19 th ault others, er U Honda and s, D s 19 Bank 79 1979; Buchanan- ) 1990) U D Santa Ynez Fault PacificoFault 1979; Buchanan-Banks U D (Sylvester and Darrow, (Sylvester and Darrow, 1979; and others, 1979) 30’ Buchanan-Banks and others, 1979) 30’ (Ogle and others, 1987) Epicentral location of 1927 Lompoc Earthquake D U (Helmberger and others, 1992) U D D U D U D D U U 34° 122° 34’ 30’ 121° 30’ 120° Base from U.S.Geological Survey 1:250,000 Topo Series: Santa Maria, 17° SCALE 1:250 000 Geology mapped by William R. Lettis, Kathryn L. Hanson, CA 1969; San Luis Obispo, CA; C&G, S 1306N-20 Cape San Martin to TRUE NORTH 5 0 5 10 15 20 25 MILES Jeffrey R. Unruh, Marcia McLaren, and William U. Savage. Point Conception 1967. Compiled in Base Map Section, Menlo Park, Edited by James W. Hendley III CA. ALFA(57-32) (3-80) 5 0 5 10 15 20 25 KILOMETERS MAGNETIC NORTH APPROXIMATE MEAN DECLINATION AT CENTER OF MAP EXPLANATION COMPILATION SOURCES OFFSHORE REGION* U Active or potentially active high angle fault (sea-oor projection of fault tip where Buchanan-Banks, J.M., Pampeyan, E.H., Wagner, H.C., and McCulloch, D.S., 1979, Survey Miscellaneous Field Studies Map MF-1285, 2 sheets, scale D blind or buried)—Deforms early/late Pliocene (2.8–3.4 Ma) unconformity or Preliminary map showing recency of faulting on coastal south-central 1:24,000. 122° 121° 120° younger deposits or surfaces; U/D (Up/Down) indicates relative sense of California: U.S. Geological Survey Miscellaneous Field Studies Map Hall, C.A., Jr., and Corbato, C.E., 1967, Stratigraphy and structure of Mesozoic and 36° displacement, bar indicates dip direction; dashed where approximately located MF-910, scale 1:250,000. Cenozoic rocks, Nipomo quadrangle, southern Coast Ranges, California: 124° 123° 122° 121° 120° Burch, S.H., 1971, Complete Bouguer gravity and general geology of the Cape San Geological Society of America Bulletin, v. 78, p. 559-582. PG&E, 1988; PG&E, 1990 42° Martin, Brysom, Piedras Blancas, and San Simeon quadrangles, California: Hall, C.A., Jr., and Prior, S.W., 1975, Geologic map of the Cayucos-San Luis Obispo Active or potentially active low angle fault (sea-oor projection of fault tip or leading U.S. Geological Survey Professional Paper 646-A, 12 p. region, San Luis Obispo County, California: U.S. Geological Survey PG&E, 1988; Clark et al, 1990 edge of ramp where blind or buried)—Deforms early/late Pliocene (2.8–3.4 Ma) California Division of Oil and Gas, 1974, California oil and gas elds, Vol. II—south, Miscellaneous Field Studies Map MF-686, 2 sheets, scale 1:24,000. 41° unconformity or younger deposits or surfaces; teeth indicate dip direction; dashed central coastal, and oshore California: California Division of Oil and Gas Hall, C.A., Jr., Ernst, W.G., Prior, S.W., and Wiese, J.W., 1979, Geologic map of the McCulloch, 1989; PG&E, 1988 Eureka Redding where approximately locate Publication No. TR12. San Luis Obispo-San Simeon region , California: U.S. Geological PG&E, 1990 40° Clark, D.H., Hall, N.T., Hamilton, D.H., and Heck, R.G., 1991, Structural analysis of late Survey Miscellaneous Investigations Series Map, I-1097, scale 1:48,000. N Active or potentially active anticline axial trace (sea-oor projection where Neogene deformation in the central oshore Santa Maria Basin, Helmberger, D.V., Somerville, P.G., and Garnero, E., 1992, The location and source PACIFIC 119° buried)—Arrow indicates direction of plunge; dashed where approximately located California: Journal of Geophysical Research, v. 96, p. 6435-6457. parameters of the Lompoc, California earthquake of 4 November, 1927: Morro Bay 39° Dibblee, T.W., Jr., 1950, Geology of southwestern Santa Barbara County, California: Bulletin of the Seismological Society of America, v. 82, p. 1678-1709. Sacramento California Division of Mines and Geology Bulletin 150, 95 p. Jennings, C.W., Jr., 1959, Geologic map of California, San Luis Obispo sheet: San Luis Obispo 118° Active or potentially active syncline axial trace (sea-oor projection where PACIFIC Dibblee, T.W., Jr., 1966, Geology of the central Santa Ynez Mountains, Santa Barbara California Division of Mines and Geology, scale 1:250,000. 38° buried)—Arrow indicates direction of plunge; dashed where approximately located San Francisco Oakland County, California: California Division of Mines and Geology Bulletin 186, Jennings, C.W., Jr., 1977, Geologic map of California: California Geologic Data 117° 99 p. Series, Map No. 2, scale 1:750,000. Active or potentially active monocline axial trace (sea-oor projection where 35° 37° Dibblee, T.W., Jr., 1973, Regional geologic map of San Andreas and related faults in McCulloch, D.S., 1987, Regional geology and hydrocarbon potential of oshore Santa Maria OCEAN Fresno 116° buried)—Arrow indicates direction of plunge; dashed where approximately located Carrizo Plain, Temblor, Caliente, and La Panza ranges and vicinity, central California, in Scholl, D.W., Grantz, A., and Vedder, J.G., eds., California: U.S.