A pitfall in shallow shear-wave refraction surveying

Journal of Applied Geophysics
By: , and 

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Abstract

The shallow shear-wave refraction method works successfully in an area with a series of horizontal layers. However, complex near-surface geology may not fit into the assumption of a series of horizontal layers. That a plane SH-wave undergoes wave-type conversion along an interface in an area of nonhorizontal layers is theoretically inevitable. One real example shows that the shallow shear-wave refraction method provides velocities of a converted wave rather than an SH- wave. Moreover, it is impossible to identify the converted wave by refraction data itself. As most geophysical engineering firms have limited resources, an additional P-wave refraction survey is necessary to verify if velocities calculated from a shear-wave refraction survey are velocities of converted waves. The alternative at this time may be the surface wave method, which can provide reliable S-wave velocities, even in an area of velocity inversion (a higher velocity layer underlain by a lower velocity layer). ?? 2002 Elsevier Science B.V. All rights reserved.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title A pitfall in shallow shear-wave refraction surveying
Series title Journal of Applied Geophysics
DOI 10.1016/S0926-9851(02)00197-0
Volume 51
Issue 1
Year Published 2002
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Applied Geophysics
First page 1
Last page 9
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