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Source shape estimation and deconvolution of teleseismic bodywaves

Clayton, Rob W. and Wiggins, Ralph A. (1976) Source shape estimation and deconvolution of teleseismic bodywaves. Geophysical Journal of the Royal Astronomical Society, 47 (1). pp. 151-177. ISSN 0016-8009. http://resolver.caltech.edu/CaltechAUTHORS:20121003-140453786

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Abstract

We consider the deconvolution of a suite of teleseismic recordings of the same event in order to separate source and transmission path phenomena. The assumption of source uniformity may restrict the range of muths and distances of the seismograms included in the suite. The source shape is estimated by separately averaging the log amplitude spectra and the phase spectra of the recordings. This method of source estimation uses the redundant source information contained in secondary arrivals. The necessary condition for this estimator to resolve the source wavelet is that the travel times of the various secondary arrivals be evenly distributed with respect to the initial arrivals. The subsequent deconvolution of the seismograms is carried out by spectral division with two modifications. The first is the introduction of a minimum allowable source spectral amplitude termed the waterlevel. This parameter constrains the gain of the deconvolution filter in regions where the seismogram has little or no information, and also trades-off arrival time resolution with arrival amplitude resolution. The second modification, designed to increase the time domain resolution of the deconvolution, is the extension of the frequency range of the transmission path impulse response spectrum beyond the optimal passband (the passband of the seismograms). The justification for the extension lies in the fact that the impulse response of the transmission path is itself a series of impulses which means its spectrum is not band-limited. Thus, the impulse response is best represented by a continuous spectrum rather than one which is set to zero outside the optimal passband. This continuity is achieved by a recursive application of a unit-step prediction operator determined by Burg's maximum entropy algorithm. The envelopes of the deconvolution are used to detect the presence of phase shifted arrivals.


Item Type:Article
Related URLs:
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http://dx.doi.org/10.1111/j.1365-246X.1976.tb01267.xDOIArticle
Additional Information:© 1976 John Wiley & Sons, Inc. Received 1976 April 8. Article first published online: 2 Apr 2007. This research was supported by the National Research Council of Canada under operating grant A8854.
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Funding AgencyGrant Number
National Research Council of CanadaA8854
Record Number:CaltechAUTHORS:20121003-140453786
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121003-140453786
Official Citation:Wiggins, R. W. C. a. R. A. (1976), Source shape estimation and deconvolution of teleseismic bodywaves. Geophysical Journal of the Royal Astronomical Society, 47: 151–177. doi: 10.1111/j.1365-246X.1976.tb01267.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34674
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:04 Oct 2012 18:11
Last Modified:25 Mar 2014 18:22

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