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Response of a vertical strain seismometer to body waves

THE GEOTECHNICAL CORPORATION, GARLAND, TEXAS

Abstract

Expressions have been derived for vertical strain due to P and SV type waves arriving at an arbitrary angle of incidence within a semi-infinite medium. The amplitude and phase relationships between vertical strain and vertical displacement have been investigated for both wave types, assuming a Poisson's ratio of 0.25. The effect of finite depth and finite length of the vertical strain instrument has been examined and found to be significant especially for small angles of incidence.

Footnotes

^* Now at Geology Department, Panjab University, Chandigarh, India.

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