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Our Job 81-20-00 Page 6 <br />location of the site, the possibility of damage to any future <br />structure due to ground rupture, liquefaction, landslide or inun- <br />dation due to Sea waves is extremely remote. Accordingly, ground <br />vibration and dynamic consolidation are the effects of earthquakes <br />which should be considered in the development and use of the <br />subject property. <br />Further seismic actirrity along the Newport- Inglewood and <br />San Andreas-San Jacinto fault systems are the most likeIy and <br />frequent source of strong shaking in the Southern Orange County <br />area. The recurrence of seisrnic activity along these systems may <br />be indicative that strain relief occurs at a fairly consistent <br />point of maximum strain. If this assumption is correct, it is <br />anticipated that future earthquakes along this system should not <br />be significantly stronger than those experienced in the past, i.e., <br />Richter Magnitude 6.3 to 6.8. The relationship between Richter <br />Magnitude, M, and ground acceleration, a, in centimeters per second <br />per second, 8t the epicenter may be roughly estimated by the <br />expression: |vt = 2..2 + I. 8 1og a. Based on this relationship, <br />which assumes a point source of energy release, a Richter Magnitude <br />6.3 corresponds to a ground acceleration of about 0.20g at the <br />epicente r. <br />statistical analysis of california earthquake data <br />indicate that the probabilities of ground acceleration with respect <br />to a 50-year life of the proposed improvements are as follows: