Focusing Effect (In Local Site Amplification)
Focusing Effect (In Local Site Amplification) : Special amplification of ground motion found just above the corner of the basin bottom or layer interfaces. In a two- or three-dimensional basin with strong lateral variation, rays of an incident body wave are warped at these interfaces and constructive (or destructive) interference takes place at some point on the surface. See Chapter 14 of this Manual and and Kawase (2003)
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