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Mr. Robert Evans • P ' ct B02-02.03 <br />January 30, 1991 <br />Page 4 <br />The Greenville, Midway, and Tesla faults yielded estimates of bedrock ac- <br />celerations above 0.1 gravity (g). The Greenville fault produced the highest <br />bedrock acceleration which was estimated at 0.18 g. The remaining faults had <br />bedrock acceleration estimates ranging from 0.08 to 0.16 g. When using the pub- <br />lished data for the San Andreas MCE, an estimated bedrock acceleration of 0.1 g <br />was obtained. All of these estimated accelerations are bedrock accelerations <br />which may be affected (i.e., attenuated or amplified) by site-specific soil condi- <br />tions. The effects of site conditions on these estimated bedrock accelerations <br />should be considered when using these estimated accelerations for design pur- <br />poses. <br />If you have any questions concerning this letter, please call. <br />Very truly yours, <br />EMCON Associates J <br />Rex S. Heppe <br />Staff Geologist <br />I I c 4��— <br />J. . Isham, C.E.G. <br />eology Manager <br />RSH/JCI:cjw <br />Attachments: References <br />Table 1 Significant Earthquake Sources <br />Figure 1 Regional Fault Map <br />Figure 2 Earthquake Epicenter Map <br />Figure 3 Peak Horizontal Acceleration in Rock vs. Horizontal <br />Distance from Zone of Energy <br />cc: Stephen Chen, City of Stockton <br />Ed Pedilla, San Joaquin County <br />Local Health Department <br />pjb\b02\b020203e <br />