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Z ---Based on avaHat a <br /> / O <br /> v <br /> Rock Estimation <br /> O cc <br /> W 0.6 <br /> Cr ' U ` ` Al <br /> W j Stiff soils // �•� --j \\♦ ♦`�\o\eS <br /> U \� <br /> Q 0.3 // i O ♦\ `\ <br /> O <br /> Q 0.2i' Y 0.2 <br /> � `♦ \♦ <br /> Deep cohesionless soils w <br /> CL `.\ <br /> 0.1 U �\ <br /> O `� `\ <br /> M / \ <br /> 2 6 10 20 `\50 100 <br /> CLOSEST HORIZONTAL DISTANCE FROM ZONE <br /> ° OF ENERGY RELEASE (mi) <br /> 0 0.1 0.2 0.3 0.4 0.5 0.8 0.7 <br /> Figure 10.22 Average values of maximum accelerations in rock. (From Seed and ldriss, <br /> Brock - MAXIMUM ACCELERATION ON ROCK, g 1982. Reproduced by permission of Earthquakes Engineering Research Institute.) <br /> Figure 10.20 Approximate values for ground acceleration. (From Seed and ldriss, 1982. <br /> Reproduced by permission of Earthquake Engineering Research Institute.) 1000 <br /> 0.6 �N M - 8 1/4 <br /> 100 M - 7 1/2 <br /> a> 0.5- <br /> Z <br /> .5 z 1 E <br /> Z O <br /> Q Q 0.410- <br /> � W -1989 LoZma Prleta i� W <br /> J i <br /> O U 0.3' �/ W <br /> r!1 Q � Q 1 <br /> u M 6 1/2 W Median relationship recommended J <br /> g U 0 2 for use in empirical correlations 11 <br /> Q LL W <br /> 0.1 0.1 <br /> / 1985 Mexico City <br /> 0i <br /> 0 0.1 0.2 0.3 0.4 0.5 0.6 0.01 <br /> ACCELERATION ON ROCK SITES, g 0 0.2 0.4 o.s 0.8 1.0 <br /> i <br /> Figure 10.21 Variations of acceleratons on soft soil sites versus rock sites. (From ldriss• i Figure 10.23 Variation of permanent displacement 1990.) Pe p yield acceleration. (From Makdisi <br /> f and Seed. 1977.) <br /> ! 541 <br />