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GEoSYMC CoM.rat 7S <br />Dr_ Hari Sharma, Pte► G.E. <br />22 January 2.001 <br />Page 7 <br />of the sources considered using the Abrahamson and Silva 11996; 1997] duration and <br />aTtenuation models. <br />for the site <br />Based on the above considerations, the design Valley fil�d�thrust system <br />as eieithera Moment Mag itude (M.) 6.7 event on th Great <br />which is apgraximately 21 miles (34 kzn] southwest of the site ora M,, 7.9 event on the <br />oYirnatel 70 mites' (112 km) 'southwest of the <br />San Andreas ' fault system which is spin • }� <br />t Magnitude (M,) <br />site. The design for the site was established as either a <br />Mom <br />system 21 miles <br />6.4 event on the Great Valley blind thrust system w approximately <br />(34 km) southwest of the site or a Ma 7.9 event on the San Andreas fault system whici► <br />is approximately 70 miles (112 km) southwest of.the site. <br />A target acceleration response spectral envelope was developed for each of the <br />MCEIWE candidate events using the median and 84P percentile acceleration response <br />spectra evaluated using the Abrahamson and Silva [19973 attenuation. model. Based <br />upon the target signnificant duration of strong ground-sbalang and acceleration response <br />al env -.lope for each candidate event, the following four time histories were <br />spear <br />selected to represent ground motions at a hypothetical bedrock outcrop at the site: <br />The 270 -degree component of the Saratoga -Aloha Avenue record. <br />from the Mw 6.9 Loma Prieta earthquake, scaled to either 0.19 g to <br />rcpresent the MCE or to 0.13 g to represent the MPE; . <br />the 315-dem= carnponent of the Santa Teresa H]Ils record from the <br />Mw 6.9 Lorna Prieta earthquake, scaled to either 0.19 g to represent . <br />the MCE or to 0.13 g to represent the WE; <br />the 360 -degree component of the Cotaalitos; Eureka Canyon Road <br />record f m the Mw 6.9 Lorna Priem earthquake, scaled to either <br />0.19 g to represent the MCE or to 0.13 g'to represent the MPE; and <br />�. P:ypW,CtWpUVR CAMF-WC CRq►,PJ)WOXMZ.DOC <br />L'd 90ZL-T09-OT5 ua.aaaut�u3 5IM07 WHVE;6 Ton? St ReW <br />5T{30 39Cd S31VI00SSV OID07039 ZEL8686606 60:ZI T00Z/T6/L0 <br />