Toward End To End Modeling For Nuclear Explosion Monitoring
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Toward End To End Modeling For Nuclear Explosion Monitoring
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Author :
language : en
Publisher:
Release Date : 2009
Toward End To End Modeling For Nuclear Explosion Monitoring written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
This paper describes new research being performed to improve understanding of seismic waves generated by underground nuclear explosions (UNE) by using full waveform simulation, high-performance computing and three-dimensional (3D) earth models. The goal of this effort is to develop an end-to-end modeling capability to cover the range of wave propagation required for nuclear explosion monitoring (NEM) from the buried nuclear device to the seismic sensor. The goal of this work is to improve understanding of the physical basis and prediction capabilities of seismic observables for NEM including source and path-propagation effects. We are pursuing research along three main thrusts. Firstly, we are modeling the non-linear hydrodynamic response of geologic materials to underground explosions in order to better understand how source emplacement conditions impact the seismic waves that emerge from the source region and are ultimately observed hundreds or thousands of kilometers away. Empirical evidence shows that the amplitudes and frequency content of seismic waves at all distances are strongly impacted by the physical properties of the source region (e.g. density, strength, porosity). To model the near-source shock-wave motions of an UNE, we use GEODYN, an Eulerian Godunov (finite volume) code incorporating thermodynamically consistent non-linear constitutive relations, including cavity formation, yielding, porous compaction, tensile failure, bulking and damage. In order to propagate motions to seismic distances we are developing a one-way coupling method to pass motions to WPP (a Cartesian anelastic finite difference code). Preliminary investigations of UNE's in canonical materials (granite, tuff and alluvium) confirm that emplacement conditions have a strong effect on seismic amplitudes and the generation of shear waves. Specifically, we find that motions from an explosion in high-strength, low-porosity granite have high compressional wave amplitudes and weak shear waves, while an explosion in low strength, high-porosity alluvium results in much weaker compressional waves and low-frequency compressional and shear waves of nearly equal amplitude. Further work will attempt to model available near-field seismic data from explosions conducted at NTS, where we have accurate characterization of the sub-surface from the wealth of geological and geophysical data from the former nuclear test program. Secondly, we are modeling seismic wave propagation with free-surface topography in WPP. We have model the October 9, 2006 and May 25, 2009 North Korean nuclear tests to investigate the impact of rugged topography on seismic waves. Preliminary results indicate that the topographic relief causes complexity in the direct P-waves that leads to azimuthally dependent behavior and the topographic gradient to the northeast, east and southeast of the presumed test locations generate stronger shear-waves, although each test gives a different pattern. Thirdly, we are modeling intermediate period motions (10-50 seconds) from earthquakes and explosions at regional distances. For these simulations we run SPECFEM3D{_}GLOBE (a spherical geometry spectral element code). We modeled broadband waveforms from well-characterized and well-observed events in the Middle East and central Asia, as well as the North Korean nuclear tests. For the recent North Korean test we found that the one-dimensional iasp91 model predicts the observed waveforms quite well in the band 20-50 seconds, while waveform fits for available 3D earth models are generally poor, with some exceptions. Interestingly 3D models can predict energy on the transverse component for an isotropic source presumably due to surface wave mode conversion and/or multipathing.
A New Network Modeling Tool For The Ground Based Nuclear Explosion Monitoring Community
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Author :
language : en
Publisher:
Release Date : 2013
A New Network Modeling Tool For The Ground Based Nuclear Explosion Monitoring Community written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
International Cooperation For Enhancing Nuclear Safety Security Safeguards And Non Proliferation
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Author : Luciano Maiani
language : en
Publisher: Springer Nature
Release Date : 2020-04-07
International Cooperation For Enhancing Nuclear Safety Security Safeguards And Non Proliferation written by Luciano Maiani and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-04-07 with Science categories.
This open access book examines key aspects of international cooperation to enhance nuclear safety, security, safeguards, and nonproliferation, thereby assisting in development and maintenance of the verification regime and fostering progress toward a nuclear weapon-free world. Current challenges are discussed and attempts made to identify possible solutions and future improvements, considering scientific developments that have the potential to increase the effectiveness of implementation of international regimes, particularly in critical areas, technology foresight, and the ongoing evaluation of current capabilities.
Research Required To Support Comprehensive Nuclear Test Ban Treaty Monitoring
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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 1997-08-01
Research Required To Support Comprehensive Nuclear Test Ban Treaty Monitoring written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-08-01 with Political Science categories.
On September 24, 1996, President Clinton signed the Comprehensive Nuclear Test Ban Treaty at the United Nations Headquarters. Over the next five months, 141 nations, including the four other nuclear weapon statesâ€"Russia, China, France, and the United Kingdomâ€"added their signatures to this total ban on nuclear explosions. To help achieve verification of compliance with its provisions, the treaty specifies an extensive International Monitoring System of seismic, hydroacoustic, infrasonic, and radionuclide sensors. This volume identifies specific research activities that will be needed if the United States is to effectively monitor compliance with the treaty provisions.
Report Of The Defense Science Board Task Force On Nuclear Weapon Effects Test Evaluation And Simulation
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Author :
language : en
Publisher: DIANE Publishing
Release Date : 2005
Report Of The Defense Science Board Task Force On Nuclear Weapon Effects Test Evaluation And Simulation written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Nuclear weapons categories.
Meteorological Monitoring Guidance For Regulatory Modeling Applications
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Author :
language : en
Publisher: DIANE Publishing
Release Date : 2000
Meteorological Monitoring Guidance For Regulatory Modeling Applications written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Air quality categories.
Monitoring A Comprehensive Test Ban Treaty
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Author : Eystein S. Husebye
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Monitoring A Comprehensive Test Ban Treaty written by Eystein S. Husebye and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
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.
Disarming Conflict
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Author : Ernie Regehr
language : en
Publisher: Bloomsbury Publishing
Release Date : 2015-10-15
Disarming Conflict written by Ernie Regehr and has been published by Bloomsbury Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-15 with Technology & Engineering categories.
In the past quarter century our world has hosted ninety-nine wars, twenty-nine of these are ongoing. The bill for maintaining huge stores of weapons and some 70 million people in uniform currently stands at $1.7 trillion a year. Of these wars, over 85 percent are not settled on the battlefield; they are fought to desperately hurting stalemates, eventually being turned over to diplomats and politicians who go in search of whatever face-saving outcomes may still be available. And yet, abandoning the conference table in favour of the battlefield is still justified when viewed as a last resort. In this brave and discerning book, Ernie Regehr, OC, explains the approaches and initiatives needed to steer away from the futility of global military effort. Combining four decades of experience in conflict zones, advising and leading diplomacy efforts, building NGOs and contributing to the adoption of the Responsibility to Protect Act by the World Assembly, Regehr boldly shows that political stability will never be issued from the barrel of a gun.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Nuclear Science Abstracts
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Author :
language : en
Publisher:
Release Date : 1976-03
Nuclear Science Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976-03 with Nuclear energy categories.