Download or read book An Analysis of the Effects of Tectonic Release on Short Period P Waves Observed from Shagan River Explosions written by Brian W. Barker and published by . This book was released on 1987 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large samples of teleseismic P wave amplitude and waveform data recorded from Shagan River underground explosions have been collected and systematically analyzed in an attempt to identify any effects which may correlate with the amount of tectonic release accompanying these explosions. Results of these analyses indicate that these teleseismic P wave data do not provide any unambiguous evidence of effects of tectonic release in the short-period range of interest in m sub b determination. However, the results of a preliminary theoretical analysis indicate that such negative evidence is not definitive in that there are plausible models of tectonic release for which no detectable variations in the observed teleseismic P waveforms are theoretically expected to result from the superposition of these two sources. At the same time, such models of tectonic release predict significant positive bias in the network-averaged m sub b values for explosions accompanied by the mode of tectonic release traditionally associated with the Shagan River test site. Thus, the currently available seismic data do not exclude the possibility that tectonic release may be introducing a positive bias of as much as several tenths of a magnitude unit into the network-averaged m sub b values computed for some Shagan River explositons. Keywords: Explosion seismology; Threshold Test Ban Treaty; Network; USSR; Global Digital Seismic; Seismic body waves; Nuclear explosion detection; Radiation patterns.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1987-10 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book RMS Lg Studies of Underground Nuclear Explosions in the U S S R and the U S written by P. G. Richards and published by . This book was released on 1993 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Preliminary Analysis of Seismic Variability at the Shagan River Nuclear Test Site written by J. M. Dermengian and published by . This book was released on 1985 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large volumes of teleseismic P wave amplitude and arrival time data recorded from explosions at this test site were collected and statistically analyzed in an attempt to define any systematic trends which correlate with source location. The results of the analysis of the teleseismic m sub b data have been shown to provide strong evidence of systematic geophysical variations within the Shagan River testing area. In particular, the m sub b station corrections have been shown to vary with source location in a manner which depends on source-to-station azimuth. Results of detailed comparisons of m sub b residual data at common stations from selected pairs of nearby explosions have been used to conclude that the observed variations in the azimuthal patterns of the m sub b residuals are related to event location rather than tectonic release effects. Results of this preliminary analysis suggest that the observed m sub b differences may be associated with changes in the near-source portions of the teleseismic P wave propagation paths. In contrast to the m sub b residual data, the reduced P wave travel-time residuals were found to show no obvious correlation with event location, and this has been interpreted as an indication that the available bulletin data are not precise enough to resolve the rather small travel-time variations which might be expected to accompany the observed m sub b variations. Keywords: Underground nuclear explosions; Seismic detection; Numerical analysis of seismic data; USSR; Geophysically distinct seismic waves; Least squares matrix factorization.

Download or read book Explosion Source Phenomenology written by Steven R. Taylor and published by American Geophysical Union. This book was released on 1991-01-08 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 65. In March 1989, the Department of Energy (DOE) and the Lawrence Livermore National Laboratory (LLNL) sponsored a symposium on Explosion Source Phenomenology at Lake Tahoe, California. The purpose was to summarize the state of knowledge of the underground explosion source, based on U.S. experience at the Nevada Test Site (NTS). Specifically, the goals were to summarize knowledge of the explosion source, to identify limits of that knowledge and existing problems, and to propose directions of future research and data?]collection efforts.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1992 with total page 1642 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling Teleseismic SV Waves from Underground Explosions with Tectonic Release written by Brian P. Cohee and published by . This book was released on 1987 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geophysical Journal written by and published by . This book was released on 1988 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 11 and 13 includes the Proceedings of the 2nd, 3rd, International Symposium on Geophysical Theory and Computers, Rehovoth, Israel, etc., 1965-66.

Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1988 with total page 1666 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of Teleseismic P Wave Amplitude and Coda Variations for Underground Explosions written by Thorne Lay and published by . This book was released on 1989 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of four investigations which have as their common goal, the development and application of techniques for determining near-source contributions to the observed variations in short-period P wave amplitudes, travel times, waveforms and coda for underground explosions. A waveform modeling analysis of long-period teleseismic SH and SV waves from two large underground explosions at the Southern Novaya Zemlya test site indicates that the appropriate equivalent double couple orientation for the tectonic release is vertical strike slip. complete waveform modeling of the SV signals using the method of Baag and Langston allows us to distinguish between the strike slip and 45 deg. dipping thrust geometries. The resulting mechanism and associated F-factors indicate that teleseismic P waves from these events are probably not strongly affected by tectonic release radiation, consistent with the previous coda and P wave amplitude analysis we conducted under our previous contract. (rh).

Download or read book Seismological Research Letters written by and published by . This book was released on 1987* with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Arms Control and Disarmament Agency Annual Report written by United States. Arms Control and Disarmament Agency and published by . This book was released on 1992 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1987 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Arms Control and Disarmament Agency 1990 and 1991 Annual Reports written by United States. Arms Control and Disarmament Agency and published by . This book was released on 1993 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Weapons Databook written by Thomas B. Cochran and published by . This book was released on 1984 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: V.1. U.S. Nuclear forces and capabilities [etc.].