Delineating a shallow fault zone and dipping bed rock strata using multichannal analysis of surface waves with a land streamer

Geophysics
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Abstract

The multichannel analysis of surface waves (MASW) seismic method was used to delineate a fault zone and gently dipping sedimentary bedrock at a site overlain by several meters of regolith. Seismic data were collected rapidly and inexpensively using a towed 30-channel land streamer and a rubberband-accelerated weight-drop seismic source. Data processed using the MASW method imaged the subsurface to a depth of about 20 m and allowed detection of the overburden, gross bedding features, and fault zone. The fault zone was characterized by a lower shear-wave velocity (Vs) than the competent bedrock, consistent with a large-scale fault, secondary fractures, and in-situ weathering. The MASW 2D Vs section was further interpreted to identify dipping beds consistent with local geologic mapping. Mapping of shallow-fault zones and dipping sedimentary rock substantially extends the applications of the MASW method. ?? 2006 Society of Exploration Geophysicists.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Delineating a shallow fault zone and dipping bed rock strata using multichannal analysis of surface waves with a land streamer
Series title Geophysics
DOI 10.1190/1.2227521
Volume 71
Issue 5
Year Published 2006
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geophysics