The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
Bradley Woods - One of the best experts on this subject based on the ideXlab platform.
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regional distance seismic moment tensors of Nuclear Explosions
Tectonophysics, 2002Co-Authors: Douglas S Dreger, Bradley WoodsAbstract:Abstract Nuclear Explosions, because of their known location, depth and theoretical source mechanism, provide a means to explore the resolution of non-double-couple and isotropic seismic moment tensors. We perform seismic moment tensor inversions on long-period (50–20 s), three-component velocity seismograms from the Caltech TERRAscope network and the Berkeley Digital Seismic Network (BDSN) to determine best-fitting double-couple, isotropic plus double-couple, deviatoric and full-moment tensor source mechanisms for the Little Skull Mountain Earthquake and three large (ML≥5.5, MW≥4.5) Nevada Test Site (NTS) Nuclear Explosions (JUNCTION, MONTELLO and BEXAR). The significance of solutions with higher degrees of freedom is evaluated using the F-test. The stability of the moment tensor solutions for variations in station configuration is investigated using a cross-validation method. Our results show that strongly non-double-couple seismic moment tensors and shallow source depth characterize the Nuclear Explosions. The full-moment tensor inversions recover a volume increase. However, our analysis indicates that the improvement in fit afforded by the extra degree of freedom is not statistically significant due to the similarity of the vertical compensated linear vector dipole (CLVD) and isotropic surface wave Green's functions at these periods. An isotropic plus double-couple source model was found to provide the same level of fit as the deviatoric moment tensor inversions. Determination of the nonisotropic source mechanism is not unique and we discuss our results with respect to the proposed source models for NTS. While the results of this study indicate that regional distance seismic moment tensor analysis is not suitable for directly discriminating Nuclear Explosions from earthquakes, the shallow source depth and non-double-couple seismic moment tensors obtained for these events suggest that it may be useful for identifying suspect events for further screening.
Frode Ringdal - One of the best experts on this subject based on the ideXlab platform.
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The Detection and Recognition of Underground Nuclear-Explosions
Surveys In Geophysics, 1995Co-Authors: P ARGO, Alan Douglas, K PLAYFORD, P. K.h. Maguire, John Hassard, Robert A Clark, V. Gupta, P. M. Lewis, Frode RingdalAbstract:This paper reports on a joint meeting of the Royal Astronomical Society's Joint Association for Geophysics and VERTIC (the Verification Technology Information Centre) held in London in 1992. The topics presented focused on the detection and recognition of underground Nuclear Explosions. The objective of the meeting was to emphasize the multi-methodological approach that is important in verifying compliance with test-ban treaties. An overview of seismological monitoring was followed by a discussion of the technical and scientific aspects of a global seismic monitoring network, and in particular of the 1991 experiment to test the large-scale international exchange of seismic data between recording stations and data centres world-wide. The current capabilities of satellite remote-sensing were presented, and their use explained in terms of both the provision of information for monitoring the development of foreign Nuclear testing programmes and also for providing sufficient information for the evaluation of treaty compliance. A review of radio-isotope sampling showed how the isotopic signature of both air and ground based sampling programmes can be diagnostic of the Nuclear source. Finally, previously classified research on the ionospheric effects of underground Nuclear Explosions was presented, the generated acoustic waves disturbing the ionosphere and producing detectable changes in the reflection of radio and radar signals which have potential as a monitoring technique.
Daizhi Liu - One of the best experts on this subject based on the ideXlab platform.
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feature extraction of underground Nuclear Explosions based on nmf and knmf
Lecture Notes in Computer Science, 2006Co-Authors: Gang Liu, Daizhi Liu, Weigang ZhaiAbstract:Non-negative matrix factorization (NMF) is a recently proposed parts-based representation method, and because of its non-negativity constraints, it is mostly used to learn parts of faces and semantic features of text. In this paper, non-negative matrix factorization is first applied to extract features of underground Nuclear explosion signals and natural earthquake signals, then a novel kernel-based non-negative matrix factorization (KNMF) method is proposed and also applied to extract features. To compare practical classification ability of these features extracted by NMF and KNMF, linear support vector machine (LSVM) is applied to distinguish Nuclear Explosions from natural earthquakes. Theoretical analysis and practical experimental results indicate that kernel-based non-negative matrix factorization is more appropriate for the feature extraction of underground Nuclear Explosions and natural earthquakes.
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ISNN (1) - Feature extraction of underground Nuclear Explosions based on NMF and KNMF
Advances in Neural Networks - ISNN 2006, 2006Co-Authors: Gang Liu, Daizhi Liu, Weigang ZhaiAbstract:Non-negative matrix factorization (NMF) is a recently proposed parts-based representation method, and because of its non-negativity constraints, it is mostly used to learn parts of faces and semantic features of text. In this paper, non-negative matrix factorization is first applied to extract features of underground Nuclear explosion signals and natural earthquake signals, then a novel kernel-based non-negative matrix factorization (KNMF) method is proposed and also applied to extract features. To compare practical classification ability of these features extracted by NMF and KNMF, linear support vector machine (LSVM) is applied to distinguish Nuclear Explosions from natural earthquakes. Theoretical analysis and practical experimental results indicate that kernel-based non-negative matrix factorization is more appropriate for the feature extraction of underground Nuclear Explosions and natural earthquakes.
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fractal analysis with applications to seismological pattern recognition of underground Nuclear Explosions
Signal Processing, 2000Co-Authors: Daizhi Liu, Ke Zhao, Hongxing ZouAbstract:Abstract The problem of discriminating between underground Nuclear Explosions and natural earthquakes is considered in this paper. The feature of statistical self-affine fractal yielded from the logarithmic power spectrum is presented, and five novel features obtained from the evolution of the signal energy with scale are also included, together with the relationships between the features advocated. Seismological pattern recognition results are shown to demonstrate the potential of the proposed methodologies of feature extraction.
Douglas S Dreger - One of the best experts on this subject based on the ideXlab platform.
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regional distance seismic moment tensors of Nuclear Explosions
Tectonophysics, 2002Co-Authors: Douglas S Dreger, Bradley WoodsAbstract:Abstract Nuclear Explosions, because of their known location, depth and theoretical source mechanism, provide a means to explore the resolution of non-double-couple and isotropic seismic moment tensors. We perform seismic moment tensor inversions on long-period (50–20 s), three-component velocity seismograms from the Caltech TERRAscope network and the Berkeley Digital Seismic Network (BDSN) to determine best-fitting double-couple, isotropic plus double-couple, deviatoric and full-moment tensor source mechanisms for the Little Skull Mountain Earthquake and three large (ML≥5.5, MW≥4.5) Nevada Test Site (NTS) Nuclear Explosions (JUNCTION, MONTELLO and BEXAR). The significance of solutions with higher degrees of freedom is evaluated using the F-test. The stability of the moment tensor solutions for variations in station configuration is investigated using a cross-validation method. Our results show that strongly non-double-couple seismic moment tensors and shallow source depth characterize the Nuclear Explosions. The full-moment tensor inversions recover a volume increase. However, our analysis indicates that the improvement in fit afforded by the extra degree of freedom is not statistically significant due to the similarity of the vertical compensated linear vector dipole (CLVD) and isotropic surface wave Green's functions at these periods. An isotropic plus double-couple source model was found to provide the same level of fit as the deviatoric moment tensor inversions. Determination of the nonisotropic source mechanism is not unique and we discuss our results with respect to the proposed source models for NTS. While the results of this study indicate that regional distance seismic moment tensor analysis is not suitable for directly discriminating Nuclear Explosions from earthquakes, the shallow source depth and non-double-couple seismic moment tensors obtained for these events suggest that it may be useful for identifying suspect events for further screening.
Kh D Rubinstein - One of the best experts on this subject based on the ideXlab platform.
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a seismic source summary for soviet peaceful Nuclear Explosions
Bulletin of the Seismological Society of America, 1999Co-Authors: D D Sultanov, John R. Murphy, Kh D RubinsteinAbstract:A summary of information is presented for 122 Soviet peaceful Nuclear Explosions (PNE) detonated during the 1965 to 1988 time period. The data presented include detonation times, locations, explosion yields, and depths of burial, as well as summary information regarding the explosion configurations and source emplacement media. This summary is intended to provide a concise reference for use in research studies of the seismic data recorded from this unique set of explosion sources.
