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Surface motions due to sub-surface sliding

DEPARTMENT OF CIVIL ENGINEERING NORTHWESTERN UNIVERSITY, EVANSTON, ILLINOIS 60201
DEPARTMENT OF ENGINEERING MECHANICS UNIVERSITY OF KENTUCKY, LEXINGTON, KENTUCKY 40506

Abstract

Horizontally polarized wave motions generated at the free surface of an elastic half-space by strike slip on a fault plane of arbitrary dip are analyzed. Prior to slippage, the stress distribution includes uniformly distributed tectonic stresses and linearly increasing normal stresses due to the weight of the material. The resistance to slip is approximated by the standard Coulomb model for static and kinetic friction. Slip is nucleated along a line parallel to the surface trace of the fault. The moving edge of the zone of slippage propagates toward the free surface with a constant velocity. The method of analysis is based on the observation that certain field quantities show dynamic similarity. The results include expressions for the particle velocities and the accelerations at the free surface. The distributions of velocity and acceleration along the surface are displayed in graphs for various values of the angle of dip, of the rate of advance of the edge of the zone of sliding, and of time.

This article has been cited by other articles:

				A. ABO-ZENA Strike-slip on a fault caused by an oblique wave Bulletin of the Seismological Society of America, April 1, 1981; 71(2): 405 - 422. [Abstract] [PDF]

				L. M. BROCK Surface motions due to fault slip in the vertical mode with friction Bulletin of the Seismological Society of America, December 1, 1975; 65(6): 1653 - 1666. [Abstract] [PDF]