Specialized Studies in Yield Estimation
Final rept. 1 Aug 1990-28 Feb 1992
WOODWARD-CLYDE CONSULTANTS PASADENA CA
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Although the main problems with test ban treaty monitoring involve improving methods for discrimination of source types, there are certain problems of continuing interest in the field of yield estimation. In terms of short period body waves and the dependence of mb on yield, these involve the effects of anelastic attenuation, pP, nonlinear phenomena such as spall and influence of 3D structure on amplitude,. A related problem involves the transportability of yield scaling relation, hips between sites in different tectonic settings. We have carried out a number of studies directed at solving these problems. Much of the work has been presented in previous reports, but common themes among the studies are the use of a waveform analysis technique called intercorrelation and a focus on the use of the newly released data from internal Soviet stations. Tile first study reported here concerns the use of the intercorrelation approach on the onset of regional Pn waves to estimate yield. The yield dependence of the source time functions can be clearly observed and measured in the data. The importance of the method is that it provides a yield estimate based on an entirely new type of information the waveform of the onset of Pn, and it is the type of information available from very small events at short distances. These are the types of data most crucial in the current treaty monitoring environment. The second study is an examination of broad-band yield scaling laws from all U.S. test sites and a correlation with them of results from Soviet sites.
- Nuclear Explosions and Devices (Non-Military)