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

Geophysics
By: , and 

Links

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)(Vs) than the competent bedrock, consistent with a large-scale fault, secondary fractures, and in-situ weathering. The MASW 2D VsVs 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.

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
Publisher GSW
Contributing office(s) Toxic Substances Hydrology Program
Description 4 p.
First page A39
Last page A42