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A Look Inside the San Andreas fault at Parkfield Through Vertical Seismic Profiling

Science

By:
, , ,
DOI: 10.1126/science.1090711

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Abstract

The San Andreas Fault Observatory at Depth pilot hole is located on the southwestern side of the Parkfield San Andreas fault. This observatory includes a vertical seismic profiling (VSP) array. VSP seismograms from nearby micro-earthquakes contain signals between the P and S waves. These signals may be P and S waves scattered by the local geologic structure. The collected scattering points form planar surfaces that we interpret as the San Andreas fault and four other secondary faults. The scattering process includes conversions between P and S waves, the strengths of which suggest large contrasts in material properties, possibly indicating the presence of cracks or fluids.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A Look Inside the San Andreas fault at Parkfield Through Vertical Seismic Profiling
Series title:
Science
DOI:
10.1126/science.1090711
Volume
302
Issue:
5651
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1746
Last page:
1748
Number of Pages:
3