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- W210319822 abstract "Although the distortion of explosion long-period waves is documented at upper mantle distances, the signature is much more subtle at regional and near-field distances. The robustness of the observation of sP in underground-nuclear-explosion waveforms of events that have large F factors are documented here. Although slapdown has not been added to the synthetic seismograms, the strong azimuthal variation can be explained by the simple addition of a double couple (tectonic release). Also, the size of tectonic release is calibrated for 18 Pahute Mesa events by comparing their SH waves with those of two western United States earthquakes. In general, the signature of tectonic release appears to be strongly frequency-dependent. We performed a moment tensor inversion at three Pahute Mesa events (CHESIRE, FARM and POOL) in different frequency bands in an attempt to isolate the dispersion of the deviatoric component of the moment tensor. Although the apparent size of tectonic release source decreases, the orientation appears to be constant. The moments of the tectonic release at regional distance also are inconsistent with near-field estimates. A model was developed for near-field tectonic release, which requires a distributed source (shear dislocation takes place at the elastic radius). Using BOXCAR and HALFBREAK waveforms, amore » constrained moment tensor inversion was performed to obtain the tectonic release orientation. This near-field orientation is in excellent agreement with the far-field results.« less" @default.
- W210319822 created "2016-06-24" @default.
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- W210319822 date "1987-11-01" @default.
- W210319822 modified "2023-09-26" @default.
- W210319822 title "Effects of tectonic release on broadband regional-distance bodywaves. Final report, January 1985-January 1987" @default.
- W210319822 hasPublicationYear "1987" @default.
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