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z <br />z <br />O <br />Q <br />o= <br />W 0.4 <br />J <br />W <br />U <br />U <br />Q 0.3 <br />X <br />< 0.2 <br />i <br />Rock <br />.Stiff soils .♦ <br />i <br />Deep cohesionless soils <br />0- <br />0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 <br />Brock - MAXIMUM ACCELERATION ON ROCK, g <br />Figure 10.20 Approximate values for ground acceleration. (From Seed and Idriss, 1982. <br />Reproduced by permission of Earthquake Engineering Research Institute.) <br />rn <br />O Z <br />z g <br />CC oCr <br />W <br />J <br />W <br />U <br />00 <br />a W <br />Fv <br />LL <br />Cr Cr <br />ACCELERATION ON ROCK SITES, 9 <br />Figure 10.21 Variations of acceleratons on soft soil sites versus rock sites. (From Idriss <br />1,990.) <br />Z <br />0 <br />cc <br />J 0.e <br />W <br />U <br />U <br />J <br />Q <br />Z 0.4 <br />O <br />N <br />tr <br />0 <br />Z <br />Y 0.2 <br />Q <br />W <br />CL. <br />V <br />0 <br />o <br />t <br />CLOSEST HORIZONTAL DISTANCE FROM ZONE too <br />OF ENERGY RELEASE (mi) <br />Figure 10.22 Average values of maximum accelerations in rock. (From Seed and Idriss, <br />1982. Reproduced by permission of Earthquakes Engineering Research Institute.) <br />ky/kmax <br />Figure 10.23 Variation of permanent displacement with yield acceleration. (From Makdisi <br />and Seed. 1977.) <br />S41 <br />