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Our Job 81-20-00 Page 9 <br />of the epicenter fron the site. We suggest that the <br />magnitude of the horizontal and vertical components of <br />ground motion be considered equa1. <br />In assigning relative earthquake risk for <br />specific areas, the terms "maximum probable earthquake" <br />and "maximum credible earthquake" have been developed. <br />The "maximum probable earthquake" is the maximum intensity <br />earthquake which night occur with a fairly high probability <br />and for all but the most critical considerations, is gen- <br />era11y used synonymously with the "naximum design earthquake". <br />The "maximum credible earthquake" would be the <br />largest earthquake which appears capable of occurring based <br />on known facts, irrespective of probability. Itthile the <br />occurrence of such an event is highly unlikely, it is still <br />a believable event and could occur within the present geo- <br />logic frarnework. Such an earthquake would presumably be <br />used as a "design" earthquake for only very critical struc- <br />tures such as nuclear power plants, where the social con- <br />sequences of a failure are catastrophic. <br />With respect to ground shaking at the site, the <br />"maximun probable earthquake" would, in our opinion, be <br />one of Richter Magnitude 6.3; i.e., epicentral activity on <br />either the Newport-Inglewood or San Jacinto faults, or <br />7.0 to 8.0 along the San Andreas fault system. Earthquake <br />activity on the Newport-Inglewood or San Jacinto fault