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

Geophysics

By:
, , , ,
DOI: 10.1190/1.2227521

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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