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 20m">20m20m 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)(Vs) than the competent bedrock, consistent with a large-scale fault, secondary fractures, and in-situ weathering. The MASW 2D Vs">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.
Citation Information
Publication Year | 2006 |
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Title | Delineating a shallow fault zone and dipping bed rock strata using multichannal analysis of surface waves with a land streamer |
DOI | 10.1190/1.2227521 |
Authors | J. Ivanov, R. D. Miller, P. Lacombe, C. D. Johnson, J.W. Lane |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Geophysics |
Index ID | 70028253 |
Record Source | USGS Publications Warehouse |
USGS Organization | Office of Ground Water; Toxic Substances Hydrology Program |