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Effects of Source RDP Models and Near-source Propagation: Implication for Seismic Yield Estimation

Saikia, Chandan K. and Helmberger, D. V. and Stead, R. J. and Woods, B. B. (2001) Effects of Source RDP Models and Near-source Propagation: Implication for Seismic Yield Estimation. Pure and Applied Geophysics, 158 (11). pp. 2173-2216. ISSN 0033-4553. doi:10.1007/pl00001145.

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It has proven difficult to uniquely untangle the source and propagation effects on the observed seismic data from underground nuclear explosions, even when large quantities of near-source, broadband data are available for analysis. This leads to uncertainties in our ability to quantify the nuclear seismic source function and, consequently the accuracy of seismic yield estimates for underground explosions. Extensive deterministic modeling analyses of the seismic data recorded from underground explosions at a variety of test sites have been conducted over the years and the results of these studies suggest that variations in the seismic source characteristics between test sites may be contributing to the observed differences in the magnitude/yield relations applicable at those sites. This contributes to our uncertainty in the determination of seismic yield estimates for explosions at previously uncalibrated test sites. In this paper we review issues involving the relationship of Nevada Test Site (NTS) source scaling laws to those at other sites. The Joint Verification Experiment (JVE) indicates that a magnitude (m_b) bias (δm_b ) exists between the Semipalatinsk test site (STS) in the former Soviet Union (FSU) and the Nevada test site (NTS) in the United States. Generally this δm b is attributed to differential attenuation in the upper-mantle beneath the two test sites. This assumption results in rather large estimates of yield for large m_b tunnel shots at Novaya Zemlya. A re-examination of the US testing experiments suggests that this δm_b bias can partly be explained by anomalous NTS (Pahute) source characteristics. This interpretation is based on the modeling of US events at a number of test sites. Using a modified Haskell source description, we investigated the influence of the source Reduced Displacement Potential (RDP) parameters

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Additional Information:© Birkhäuser Verlag Basel, 2001. (Received October 20, 1999, revised May 18, 2000, accepted May 26, 2000) The authors would like to thank John R. Murphy, Maxwell Federal Technologies, Thorne Lay, University of California, Santa Cruz and an anonymous reviewer for their comments during the review of the original manuscript, which helped significantly in enhancing the manuscript. Special thanks to L. J. Burdick and David G. Harkrider for their interest, contributions and fruitful discussions during the various phases of this study.
Group:Seismological Laboratory
Subject Keywords:RDP, NTS, scaling relationships, synthetics, Gasbuggy, Rulison etc.
Issue or Number:11
Record Number:CaltechAUTHORS:20190829-131532824
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Official Citation:Saikia, C., Helmberger, D., Stead, R. et al. Pure appl. geophys. (2001) 158: 2173.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98340
Deposited By: George Porter
Deposited On:30 Aug 2019 15:55
Last Modified:16 Nov 2021 17:38

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