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Locating non-volcanic tremor along the San Andreas Fault using a multiple array source imaging technique

Geophysical Journal International

By:
, , , ,
DOI: 10.1111/j.1365-246X.2010.04805.x

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Abstract

Non-volcanic tremor (NVT) has been observed at several subduction zones and at the San Andreas Fault (SAF). Tremor locations are commonly derived by cross-correlating envelope-transformed seismic traces in combination with source-scanning techniques. Recently, they have also been located by using relative relocations with master events, that is low-frequency earthquakes that are part of the tremor; locations are derived by conventional traveltime-based methods. Here we present a method to locate the sources of NVT using an imaging approach for multiple array data. The performance of the method is checked with synthetic tests and the relocation of earthquakes. We also applied the method to tremor occurring near Cholame, California. A set of small-aperture arrays (i.e. an array consisting of arrays) installed around Cholame provided the data set for this study. We observed several tremor episodes and located tremor sources in the vicinity of SAF. During individual tremor episodes, we observed a systematic change of source location, indicating rapid migration of the tremor source along SAF. ?? 2010 The Authors Geophysical Journal International ?? 2010 RAS.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Locating non-volcanic tremor along the San Andreas Fault using a multiple array source imaging technique
Series title:
Geophysical Journal International
DOI:
10.1111/j.1365-246X.2010.04805.x
Volume
183
Issue:
3
Year Published:
2010
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1485
Last page:
1500
Number of Pages:
16