Source pulse enhancement by deconvolution of an empirical Green's function
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Abstract
Observations of the earthquake source-time function are enhanced if path, recording-site, and instrument complexities can be removed from seismograms. Assuming that a small earthquake has a simple source, its seismogram can be treated as an empirical Green's function and deconvolved from the seismogram of a larger and/or more complex earthquake by spectral division. When the deconvolution is well posed, the quotient spectrum represents the apparent source-time function of the larger event. This study shows that with high-quality locally recorded earthquake data it is feasible to Fourier transform the quotient and obtain a useful result in the time domain. In practice, the deconvolution can be stabilized by one of several simple techniques.
In this paper, the method is implemented and tested on high-quality digital recordings of aftershocks of the Jan. 9, 1982 Miramichi (New Brunswick) earthquake. In particular, seismograms from a Jan. 17 aftershock (017 13:33 GMT, local mag.=3.5) exhibit path or site effects which complicate the determination of source parameters. After deconvolution, the apparent far-field source of this event is a simple pulse in displacement with duration ≈ 0.07 second for both P and S.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Source pulse enhancement by deconvolution of an empirical Green's function |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/GL012i001p00033 |
| Volume | 12 |
| Issue | 1 |
| Year Published | 1985 |
| Language | English |
| Publisher | American Geophysical Union |
| Description | 4 p. |
| First page | 33 |
| Last page | 36 |
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