Earthquake source parameters determined by the SAFOD Pilot Hole seismic array
Geophysical Research Letters
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Abstract
We estimate the source parameters of #3 microearthquakes by jointly analyzing seismograms recorded by the 32-level, 3-component seismic array installed in the SAFOD Pilot Hole. We applied an inversion procedure to estimate spectral parameters for the omega-square model (spectral level and corner frequency) and Q to displacement amplitude spectra. Because we expect spectral parameters and Q to vary slowly with depth in the well, we impose a smoothness constraint on those parameters as a function of depth using a linear first-differenfee operator. This method correctly resolves corner frequency and Q, which leads to a more accurate estimation of source parameters than can be obtained from single sensors. The stress drop of one example of the SAFOD target repeating earthquake falls in the range of typical tectonic earthquakes. Copyright 2004 by the American Geophysical Union.
Suggested Citation
Imanishi, K., Ellsworth, W., and Prejean, S., 2004, Earthquake source parameters determined by the SAFOD Pilot Hole seismic array: Geophysical Research Letters, v. 31, no. 12, https://doi.org/10.1029/2004GL019420.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Earthquake source parameters determined by the SAFOD Pilot Hole seismic array |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2004GL019420 |
| Volume | 31 |
| Issue | 12 |
| Publication Date | May 19, 2004 |
| Year Published | 2004 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |