High Frequency Seismic Source Characteristics Of Cavity Decoupled Underground Nuclear Explosions

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High Frequency Seismic Source Characteristics of Cavity Decoupled Underground Nuclear Explosions

Author : J. R. Murphy
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis High Frequency Seismic Source Characteristics of Cavity Decoupled Underground Nuclear Explosions by : J. R. Murphy

Download or read book High Frequency Seismic Source Characteristics of Cavity Decoupled Underground Nuclear Explosions written by J. R. Murphy and published by . This book was released on 1988 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research investigated the high frequency characteristics of the seismic sources corresponding to cavity decoupled nuclear explosions and to assess the implications of these investigations with regard to the detection and discrimination of small decoupled explosions. This study has been carried out using a combination of deterministic simulations and analyses of empirical data recorded from selected cavity decoupled explosions. With regard to the deterministic simulations, a series of nonlinear finite difference calculations have been performed to simulate cavity decoupled explosions in unsaturated tuff and salt emplacement media. These simulations have confirmed the fact that the simple step pressure approximation is not valid at high frequencies and that the initial pressure spike on the cavity wall can induce significant nonlinear response. Preliminary analyses of high frequency seismic data recorded from the STERLING decoupled explosion in salt and the MILL YARD decoupled explosion in unsaturated tuff have provided evidence that the high frequency source components associated with the complex cavity pressure loadings do effectively couple into the seismic regime, in agreement with the predictions of the nonlinear finite difference simulations.

Seismic Identification Analyses of Cavity Decoupled Nuclear and Chemical Explosions

Author : John R. Murphy
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Seismic Identification Analyses of Cavity Decoupled Nuclear and Chemical Explosions by : John R. Murphy

Download or read book Seismic Identification Analyses of Cavity Decoupled Nuclear and Chemical Explosions written by John R. Murphy and published by . This book was released on 1994 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Further Studies of the Seismic Characteristics of Russian Explosions in Cavities: Implications for Cavity Decoupling of Underground Nuclear Explosions

Download Further Studies of the Seismic Characteristics of Russian Explosions in Cavities: Implications for Cavity Decoupling of Underground Nuclear Explosions PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 79 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Further Studies of the Seismic Characteristics of Russian Explosions in Cavities: Implications for Cavity Decoupling of Underground Nuclear Explosions by :

Download or read book Further Studies of the Seismic Characteristics of Russian Explosions in Cavities: Implications for Cavity Decoupling of Underground Nuclear Explosions written by and published by . This book was released on 1996 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides a summary of the results of a joint research program under which scientists from S-CUBED have been working with scientists from the Russian Institute for Dynamics of the Geospheres in an attempt to develop a better understanding of the effects of cavity decoupling on the seismic signals produced by underground nuclear explosions. Investigations conducted under this program have focused on analyses of seismic data recorded from a series of HE cavity decoupling experiments conducted by the Russians in Kirghizia in 1960, and from a sequence of nuclear tests conducted in a water-filled cavity at the Soviet Azgir test site during the period 1975-1979. The Kirghizia series included tests designed to assess the influence of cavity geometry on decoupling effectiveness, and comparisons of near-field seismic data recorded from these tests indicate that the low frequency decoupling factor is independent of cavity shape for elongated cavities with length to width ratios of 6 or more, in agreement with previous theoretical simulation results. Broadband seismic data recorded from the Azgir water-filled cavity tests are analyzed to estimate cavity/tamped source spectral ratios, and the results are compared with theoretical finite difference simulations of these tests.

Analyses of the Seismic Characteristics of U.S. and Russian Cavity Decoupled Explosions

Author :
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Analyses of the Seismic Characteristics of U.S. and Russian Cavity Decoupled Explosions by :

Download or read book Analyses of the Seismic Characteristics of U.S. and Russian Cavity Decoupled Explosions written by and published by . This book was released on 1994 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a summary of the initial results of an on-going joint research program in which S-CUBED scientists are working with Russian scientists from the Institute for Dynamics of the Geospheres in an attempt to develop a better understanding of the effects of cavity decoupling on the seismic signals produced by underground nuclear explosions. This program includes analyses of seismic data recorded from a series of 10 tamped and 12 decoupled HE tests which were conducted in cavities of different sizes and shapes in Kirghizia in 1960, a theoretical evaluation of the influence of radiation diffusion effects on nuclear cavity decoupling efficiency and an analysis of data recorded from six small (0.01 to 0.50 kt) Russian nuclear tests conducted in a 32 m radius, water-filled cavity in salt at the Azgir test site. (MM).

Monitoring Underground Nuclear Explosions

Author : Ola Dahlman
Publisher : Elsevier
ISBN 13 : 1483165167
Total Pages : 451 pages
Book Rating : 4.4/5 (831 download)

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Book Synopsis Monitoring Underground Nuclear Explosions by : Ola Dahlman

Download or read book Monitoring Underground Nuclear Explosions written by Ola Dahlman and published by Elsevier. This book was released on 2016-10-27 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monitoring Underground Nuclear Explosions focuses on the checking of underground nuclear explosions, including the Comprehensive Test Ban Treaty (CTB), seismological stations, earthquake-source models, and seismicity. The publication first elaborates on test-ban negotiations, nuclear explosions, seismological background, and explosions and earthquakes as seismic sources. Concerns cover comparison between explosion-source and earthquake-source models, theoretical calculation of seismic waves, earth structure, seismicity, nuclear test activities, bomb designs, and disarmament treaties. The manuscript then tackles seismological stations, detection, event definition and location, depth estimation, and identification. Topics include multistation discriminants, statistical aspects, long-period and short-period signals, near distances, location by a network of stations, international data exchange, station detection capabilities, and station networks. The book examines the monitoring of a comprehensive test-ban treaty, nonseismological identification, evasion, peaceful nuclear explosions, and yield estimation. The text is a dependable reference for researchers interested in the monitoring of underground nuclear explosions.

An Analysis of the Seismic Source Characteristics of Explosions in Low-Coupling Dry Porous Media

Author :
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (495 download)

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Book Synopsis An Analysis of the Seismic Source Characteristics of Explosions in Low-Coupling Dry Porous Media by :

Download or read book An Analysis of the Seismic Source Characteristics of Explosions in Low-Coupling Dry Porous Media written by and published by . This book was released on 2009 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dependence of seismic source coupling of underground nuclear explosions on the characteristics of the Q explosion source medium is an important consideration in any assessment of nuclear test monitoring capability. In particular, while experience has indicated that normal depth explosions in almost all hardrock and water saturated emplacement media (i.e., "good-coupling" media) are roughly consistent with a single nib/yield relation for any fixed tectonic source region, explosions in dry, porous media such as the dry tuffs and alluvium found above the water table at the Nevada Test Site (NTS), are typically observed to have m(b) values at a given yield that are lower than those in hardrock by about 0.50 +/- 0.25 magnitude units. With the exception of the complex cavity decoupling evasion scenario, which is not always feasible, explosions in such low-coupling media define the lower bound on the detection capability required to successfully monitor small, clandestine underground nuclear tests. However, at the present time, no fully reliable seismic source model is available to support quantitative analyses of broadband data recorded from such explosions.

A Comparative Analysis of the Seismic Characteristics of Cavity Decoupled Nuclear and Chemical Explosions

Author :
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis A Comparative Analysis of the Seismic Characteristics of Cavity Decoupled Nuclear and Chemical Explosions by :

Download or read book A Comparative Analysis of the Seismic Characteristics of Cavity Decoupled Nuclear and Chemical Explosions written by and published by . This book was released on 1995 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Successful seismic monitoring of any eventual Comprehensive Test Ban Treaty will require the development of a capability to identify signals from small cavity decoupled nuclear explosions from among the numerous signals to be expected from earthquakes, rockbursts and chemical explosion (CE) events of comparable magnitude. The investigations summarized in this report center on a variety of comparative analyses of observed and simulated seismic data corresponding to decoupled nuclear explosions with data recorded from both tamped and near-surface, ripple-fired CE events. More specifically, seismic data recorded from cavity decoupled nuclear tests in both the U.S. and former Soviet Union are used to assess the relative seismic coupling efficiencies of the different types of CE events and to evaluate potential seismic discriminants which might be used to identify the various source types. The results of these comparison studies indicate that tamped CE events with yields on the order of 7 tons and ripple fired CE events with yields in the 70-100 ton range can be expected to produce near-regional ground motion levels comparable to those expected from fully decoupled 1 kt nuclear explosions at Azgir.

ERDA Energy Research Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 848 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis ERDA Energy Research Abstracts by :

Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1989 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Energy Research Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 724 pages
Book Rating : 4.:/5 (3 download)

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Book Synopsis Energy Research Abstracts by :

Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.

Analysis of the Seismic Characteristics of U.S. and Russian Cavity Decoupled Explosions

Author : J. R. Murphy
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (228 download)

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Book Synopsis Analysis of the Seismic Characteristics of U.S. and Russian Cavity Decoupled Explosions by : J. R. Murphy

Download or read book Analysis of the Seismic Characteristics of U.S. and Russian Cavity Decoupled Explosions written by J. R. Murphy and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cavity decoupling evasion scenario remains as the greatest challenge to effective seismic monitoring of any eventual CTBT. However, despite the fact that the feasibility of this evasion concept was experimentally established nearly 30 years ago by the U.S. STERLING test, a number of issues of importance with respect to seismic monitoring still remain unresolved. In an attempt to address some of these issues, we have been working with scientists from the Russian Institute For Dynamics of the Geospheres to integrate the limited U.S. and Russian data and modeling experience into a uniform database on cavity decoupling. During the past year, our research has centered on analyses of data recorded from an extensive series of Russian HE cavity decoupling tests conducted in Kirghizia in 1960 and on analyses of seismic data recorded from six Russian nuclear tests conducted in a water-filled cavity at Azgir. The Kirghizia HE cavity decoupling series consisted of 10 tamped and 12 cavity tests in limestone, and included tests of the same yield in both spherical and nonspherical cavities of equal volume. Comparisons of near-field seismic data recorded from these tests indicate that the low frequency decoupling effectiveness is approximately independent of cavity shape for roughly cylindrical cavities with length to width ratios of 6 or more, in agreement with previous theoretical simulation results. Spectral analyses of waveform data recorded at the same distances from 1.0 ton tamped explosions and from a 1.0 ton decoupled test in a spherical cavity with a radius of 2.88 m indicate a maximum low frequency decoupling factor of about 25 for this test.

Monitoring a Comprehensive Test Ban Treaty

Author : Eystein S. Husebye
Publisher : Springer Science & Business Media
ISBN 13 : 9401104190
Total Pages : 843 pages
Book Rating : 4.4/5 (11 download)

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Book Synopsis Monitoring a Comprehensive Test Ban Treaty by : Eystein S. Husebye

Download or read book Monitoring a Comprehensive Test Ban Treaty written by Eystein S. Husebye and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 843 pages. Available in PDF, EPUB and Kindle. Book excerpt: An international treaty banning the testing of any nuclear device in any environment - a comprehensive test ban treaty (CTBT) - has been on the political agenda for nearly 40 years. Objections to a CTBT have been political, technical, or a combination of both. However, the possibilities seem better after the end of the Cold War. In the prevailing, cooperative disarmament climate a CTBT appears likely to be approved by most countries in 1996. Hence the great current interest in monitoring technologies and capabilities. Such issues are comprehensively addressed here, a preamble being devoted to the political developments and setbacks over the past 40 years. Since seismic means are considered the dominant monitoring element, they are explored in detail. Contributions cover network deployments, advanced signal processing, wave propagation in heterogeneous media, and seismic source representations, and a variety of techniques for source classification (including neural networks). Complementary monitoring techniques, such as hydroacoustics, radionuclides and infrasound, are also summarised. The IAEA operation for monitoring compliance with the Non-Proliferation Treaty is also presented. The book also includes eyewitness accounts of the Soviet 50 Mt megabomb development and test, as well as the efforts made by the state to monitor the nuclear test programmes of the western powers. Includes some 33 articles written by distinguished scientists active in CTBT monitoring research for decades.

Enhanced Coupling and Decoupling of Underground Nuclear Explosions

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Enhanced Coupling and Decoupling of Underground Nuclear Explosions by :

Download or read book Enhanced Coupling and Decoupling of Underground Nuclear Explosions written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The seismic coupling efficiency of nuclear explosions was studied in granite by means of computer calculations as a function of scaled explosion source radius. The scaled source radii were varied from 0.1 m/kt13 (point source) to 20 m/kt13 (representing a nearly full decoupling cavity). It was found that seismic coupling efficiency is at a maximum when the scaled source radius is approximately 2 m/kt13. The primary cause of this maximum in seismic wave source strength is the effect of initial source radius on peak particle velocity and pulse duration of the outgoing elastic wave. A secondary cause is that rock vaporization (an energy sink) does not occur for scaled source radii somewhat greater than 1 m/kt13. Therefore, for scaled source radii greater than 1 m/kt13, there is additional energy available for seismic wave generations. Available data for some nuclear explosions at the Nevada Test Site do not provide sufficient evidence to either support or negate the enhanced coupling that is indicated by calculations at scaled source radii of 1-2 m/kt13.

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 920 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Decoupling Estimates for Underground Explosions

Author : B. L. Tucker
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Decoupling Estimates for Underground Explosions by : B. L. Tucker

Download or read book Decoupling Estimates for Underground Explosions written by B. L. Tucker and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a considerable body of data, including all the direct P-Wave data from Project Cowboy, which indicates a decoupling factor of the order of two for a salt cavity compared to tamped alluvium or valley tuff. Cavities in soft rock probably do not decouple at all but increase the seismic signal. An increase in decoupling due to high frequency absorption appears unlikely, but should such an effect exist, decoupling factors would probably still be less than ten. Cavity decoupling may actually increase detectability because of the lower background noise at the higher frequencies produced by the cavity. (Author).

Nuclear Science Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 764 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Nuclear Science Abstracts by :

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Seismic Verification of Nuclear Testing Treaties

Author :
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (29 download)

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Book Synopsis Seismic Verification of Nuclear Testing Treaties by :

Download or read book Seismic Verification of Nuclear Testing Treaties written by and published by . This book was released on 1988 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Regional Discrimination of Quarry Blasts, Earthquakes and Underground Nuclear Explosions

Author : T. J. Bennett
Publisher :
ISBN 13 :
Total Pages : 145 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Regional Discrimination of Quarry Blasts, Earthquakes and Underground Nuclear Explosions by : T. J. Bennett

Download or read book Regional Discrimination of Quarry Blasts, Earthquakes and Underground Nuclear Explosions written by T. J. Bennett and published by . This book was released on 1989 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigations conducted under this contract focused on analyses of the higher-frequency phases observed at regional distances from underground nuclear explosions, earthquakes, and commercial blasts. These analyses systematically compared the time-domain amplitude and spectral characteristics of the observed regional seismic signals in order to identify diagnostic differences which would be indicative of source type. The sources were located in three tectonic environments: (1) eastern North America, (2) southern Soviet Union, and (3) western United States. Each source environment provides a unique contribution to the regional discrimination problem. For these source regions digital data from several different high-quality seismic networks were analyzed. The data sources were the Regional Seismic Test Network (RSTN), the Eastern Canada Telemetered Network (ECTN), the Chinese Digital Seismic Network (CDSN), the Soviet/Natural Resources Defense Council (NRDC) network, and the Lawrence Livermore National Laboratory (LLNL) network. (jhd).