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Abstract:
Magnitude-yield calibration of Northern Eurasia can be improved by using the large chemical and Peaceful Nuclear Explosion (PNEs) seismic datasets acquired by the Soviet Deep Seismic Sounding (DSS) program. Currently, we are using inversion and numerical modeling to analyze the coda amplitude parameters and P-wave travel times from numerous DSS explosions, which would lead to a detailed empirical mapping of seismic properties within northern Eurasia. In this report, PNE Lg coda amplitudes from seven profiles are inverted to produce maps of the following new coda parameters: 1) frequency-dependent scattering intensities, 2) geometrical parameter (gamma), and 3) effective quality (Qe). The gamma and frequency-independent Qe parameters replace the traditional frequency-dependent Q(f) = Q0(f/f0)n parameterization and provide stability, independence of assumptions of a background model, and convenience in interpretation. As we have shown before, parameter gamma also yields itself to independent numerical waveform modeling, correlates with crustal tectonic types, and may be a portable attribute valuable for coda regionalization. All three maps show notable correlations with regional tectonics and with recently derived maps of phase amplitude ratios and Lg Q.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Conference paper |
| Pages: |
12 |
| Report Date: |
Sep 2008 |
| Contract Number: |
DE-FC52-05NA26609 DEFC5205NA26 |
| Report Number: |
A222615 |
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