• journal_title：Geophysics
• Contributor：Julian Ivanov ; Richard D. Miller ; Pierre Lacombe ; Carole D. Johnson ; John W. Lane ; Jr.
• Publisher：Society of Exploration Geophysicists
• Date：2006-
• Format：text/html
• Language：en
• Identifier：10.1190/1.2227521
• journal_abbrev：Geophysics
• issn：0016-8033
• volume：71
• issue：5
• firstpage：A39
• section：GEOPHYSICS LETTERS

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