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2007•Geophysical Journal of the Royal Astronomical SocietyRequires access

A Procedure for Modelling Shallow Dislocation Sources*

Charles A. Langston, Donald V. Helmberger

Open publisher page 490 citations

Abstract

Expressions for displacements on the surface of a layered half-space due to an arbitrary oriented shear dislocation are given in terms of generalized ray expansions. Useful approximations of these expressions for shallow events as recorded at teleseismic distances for realistic earth models are presented. The results of this procedure are used to generate synthetic P, SV and SH waveforms for various assumptions of stress-drop.

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What this paper is about

Expressions for displacements on the surface of a layered half-space due to an arbitrary oriented shear dislocation are given in terms of generalized ray expansions. Useful approximations of these expressions for shallow events as recorded at teleseismic distances for realistic earth models are presented. The results of this procedure are used to generate synthetic P, SV and SH waveforms for various assumptions of stress-drop.

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Available abstract

Expressions for displacements on the surface of a layered half-space due to an arbitrary oriented shear dislocation are given in terms of generalized ray expansions. Useful approximations of these expressions for shallow events as recorded at teleseismic distances for realistic earth models are presented. The results of this procedure are used to generate synthetic P, SV and SH waveforms for various assumptions of stress-drop.

Key concepts: Dislocation, Geology, Shear (geology), Waveform, Shear stress, Mathematical analysis, Geometry, Geodesy

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