Open AccessLocating non‐volcanic tremor along the San Andreas Fault using a multiple array source imaging technique
Author(s) -
Ryberg T.,
Haberland Ch.,
Fuis G. S.,
Ellsworth W. L.,
Shelly D. R.
Publication year - 2010
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.2010.04805.x
Subject(s) - geology , seismology , episodic tremor and slip , san andreas fault , subduction , seismic array , volcano , fault (geology) , data set , tectonics , computer science , artificial intelligence
SUMMARY 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.