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Bulletin of the Seismological Society of America; June 1989; v. 79; no. 3; p. 610-630
© 1989 Seismological Society of America
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Amplification of obliquely incident seismic waves by cylindrical alluvial valleys of arbitrary cross-sectional shape. Part I. Incident P and SV waves

K. R. KHAIR, S. K. DATTA and A. H. SHAH

DEPARTMENT OF MECHANICAL ENGINEERING AND CIRES UNIVERSITY OF COLORADO, BOULDER, COLORADO 80309-0427
DEPARTMENT OF CIVIL ENGINEERING UNIVERSITY OF MANITOBA, WINNIPEG, Canada, R3T 2N2

Abstract

Amplification of ground motion in three dimensions due to arbitrarily shaped cylindrical alluvial valleys is investigated in this paper. A hyrid numerical method combining boundary-integral representation and finite-element discretization has been employed. The incident wave is either a plane P or SV wave, propagating at an arbitrary angle to the axis of the cylindrical valley. Numerical results showing significant dynamic amplification are presented for various angles of incidence and two different geometries of the valleys.




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