A pitfall in shallow shear-wave refraction surveying
Journal of Applied Geophysics
By: J. Xia, R. D. Miller, C.B. Park, E. Wightman, and R. Nigbor
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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.
| 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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