We present the results of three studies to develop and verify techniques to classify weak seismic events. (1) The method and results of full waveform inversion for both detailed source parameters and structure parameters are described. Input data were seismograms from industrial explosions in Eastern Kazakhstan recorded by the NRDC seismic network in 1987. Very good fits were produced between the synthetic seismograms and the observed data on all three ...
We have completed a study which was aimed at obtaining fundamental understanding of regional wave propagation by attempting to match synthetic seismograms with real data. The first part of this study involved the identification and analysis of a set of local and regional seismic events recorded near the former Soviet test site at Semipalatinsk. We then applied full waveform inversion in the 0.5 to 1 Hertz frequency band to selected ...
As part of a broader effort to invert tor Eurasian crust an upper mantle structure, a study has been undertaken to-investigate the effects of structural model variations on regional synthetic seismograms. The intent of this study is to produce regional synthetic seismograms that approximately match the observed data so that the inferred structural models can be used as starting points in a formal inversion procedure. Using laterally homogeneous structural models ...
In order to improve our abilities to discriminate low yield nuclear explosions and to obtain accurate yield estimates, a study has been undertaken to infer detailed source and structural parameters by direct inversion of broad band seismic data using laterally homogeneous forward modeling methods. Three key problems have been identified which must be solved: the development of an accurate and efficient algorithm for computing differential seismograms, which are necessary for ...
Much attention has been paid to the problem of the efficient computation of complete solution synthetic seismograms for flat, plane layered, laterally homogeneous elastic media and for high frequency bandwidths in the field of solid-earth geophysics. The only available methods for computing complete synthetic seismograms are computationally expensive and often suffer from numerical instabilities which limit their ranges of applicability. This report presents a new method based on a spectral ...
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