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!s i <br /> I� <br /> r <br /> Table 4.2-1: Major Faults Potentially Affecting the Project Site i <br /> Expected Expected <br /> ;. Approximate Maximum Ground <br /> =` Distance Maximum Peak Ground. Shaking <br /> from Project Credible Acceleration Intensity at <br /> Area Earthquake" during MCE3 . the Site � <br /> Fault (miles) ' (M,) (g) (MMI) <br /> San Andreas (1906 <br /> segment) 49 7.9 0.04 VI �! <br /> Calaveras (south) 29 6.2 0.05 Vi <br /> Greenville 14 6.9 0.19 Vlll u <br /> .. .I <br /> Hayward Fault (south) 33 6.9 0.07 VI " <br /> Ortigalita 24 6.9 0.07 VII <br /> Foothills 45 6.5 0.05 VI <br /> t <br /> Concord 45 6.9 0.04 <br /> VI <br /> Coast Range-Sierran <br /> Block Boundary.Zone 2 6.7 0.54 IX <br /> Notes: NA= Data not available. <br /> MMI = Modified Mercalli Intensity. <br /> I` g =acceleration of gravity. <br /> 1 <br /> The maximum credible earthquake(MCE) is the largest earthquake expected under the present geologic <br /> framework. <br /> 2 Estimated moment magnitude of MCE from (CDMG, 1997), except where noted. <br /> s Expected maximum peak ground accelerations are based on distance-magnitude-attenuation relationships it <br /> in (Joyner and Boore, 1981). <br /> ` The northern San Andreas fault system includes additional fault zones that could generate <br /> earthquakes, which could cause moderate to strong ground shaking at the project site. <br /> ` The closest active fault of the San Andreas fault system to the project site is the Greenville <br /> E .k fault. Located approximately 14 miles to the west, the Greenville fault is considered <br /> capable of generating a M 6.9 earthquake. On 24 January 1980, a moderately strong <br /> earthquake. (M 5.5) occurred on the Greenville fault, causing moderate to strong !� <br /> groundshaking in the region. <br /> In the area of the project site, numerous distinct segments of the CRSBBZ at the western <br /> } edge of the Sacramento Valley have been identified (Wakabayashi and Smith, 1994) as <br /> being capable of generating M 6 or greater earthquakes. These potential seismic sources !, <br /> include the CRSBBZ segments identified along the mountain front located approximately it <br /> s 1.4 miles west of the project site. The closest segments (Segments 13 and 9) are estimated I� <br /> to be capable of producing M 6.7 earthquakes. The average recurrence interval (i.e., ,I <br /> Draft Environmental Impact Report 4-9 ER-96 <br /> h <br /> �I <br />