Download or read book Evaluation of Regional Seismic Discriminants Using the Intelligent Seismic Event Identification System written by and published by . This book was released on 1992 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the effectiveness of several regional waveform discriminants and processing methods are being evaluated using a large database of regional waveforms. ISEIS has been installed at the Center for Seismic Studies (CSS) where it is being used to process and analyze discriminants for seismic events formed by the Intelligent Monitoring System (IMS). The system has undergone a number of modifications to interface with the CSS databases and to improve the processing efficiency of the system in the CSS environment. Also, a number of new features have been added to facilitate the processing of the data and discrimination research, including automated feature extraction and processing, improved plotting displays for reviewing IMS and analyst phase identification, data viewing displays for reference events plotted in scatterplots, a new top-level display for viewing ISEIS processing results, multichannel coherence and deconvolution processing interfaces, and a research interface for multivariate classification using a simulated neural network approach.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design and Development of the Intelligent Event Identification System written by Douglas R. Baumgardt and published by . This book was released on 1991 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project is to design and develop an Intelligent Event Identification System, or ISEIS, which will be a prototype for routine event identification of small explosions and earthquakes and to serve as a tool for discrimination research. The first part of this study gives an overview of the system design and the results of a preliminary evaluation of the system on events in Scandinavia and the Soviet Union. The system was designed to be highly modular to allow the easy incorporation of new discriminants and/or discrimination processes. Because the main objective of the system is the identification of small events, most of the initial ISEIS prototype discriminants utilize regional seismic data recorded by the regional arrays, NORESS and ARCESS. However, ISEIS can easily process other regional array data (e.g., from GERESS and FINESA), as well as data from three-component single stations, as more of this data becomes available. The second part of this study is entitled Intelligent Event Identification System: User's Manual, and gives a detailed description of all the processing interfaces of ISEIS. The third part of this study is entitled Intelligent Event Identification System: Software Maintenance Manual, which describes the ISEIS software from the programmer's perspective and provides information for maintenance and modification of the software modules in the system.

Download or read book Case Studies of Seismic Discrimination Problems and Regional Discriminant Transportability written by Douglas R. Baumgardt and published by . This book was released on 1995 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes case studies of regional seismic discriminants, using the Intelligent Seismic Event Identification System (ISEIS), and addresses issues related to the transportability of regional discriminants. Some of the key results of this study include: (1) Observations of large Lg waves from mine blasts. (2) Investigation of the P/S frequency-dependence discriminant. (3)The importance of signal decorrelation in the generation of spectral scalloping by ripple fired mine blasts. (4) Path corrections for the Lg spectral ratio discriminant using a simple anelastic attenuation model. Also described in this report is a discrimination study of the January 5, 1995 Urals mine event. Because there were no nearby earthquakes or blasts in the Urals mine region, recordings of the event at regional station ARU were compared with WMQ recordings of Chinese nuclear blasts and earthquakes at comparable distance, but in a different geographic and tectonic region. This comparison indicated that the January 3, 1995 event had Pn/Lg amplitude ratios more comparable to Chinese earthquakes than nuclear explosions. Based on the analysis of Pn/Lg ratios at NORESS and comparison those produced by PNEs in the same region recorded at NORSAR, we conclude that the January 3, 1995 event produced much stronger shear waves (Sn, Lg) relative to P than did nuclear blasts. We conclude that the event was probably a mine tremor or collapse.

Download or read book Intelligent Event Identification System Volume 2 User s Manual written by and published by . This book was released on 1991 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project is to design and develop an Intelligent Event Identification System, or ISEIS, which will be a prototype for routine event identification of small explosions and earthquakes and to serve as a tool for discrimination research. The first part of this study gives an overview of the system design and the results of a preliminary evaluation of the system on events in Scandinavia and the Soviet Union. The system was designed to be highly modular to allow the easy incorporation of new discriminants and/or discrimination processes. Because the main objective of the system is the identification of small events, most of the initial ISEIS prototype discriminants utilize regional seismic data recorded by the regional arrays, NORESS and ARCESS. However, ISEIS can easily process other regional array data (e.g., from GERESS and FINESA), as well as data from three-component single stations, as more of this data becomes available. The second part of this study is entitled Intelligent Event Identification System: User's Manual, and gives a detailed description of all the processing interfaces of ISEIS. The third part of this study is entitled Intelligent Event Identification System: Software Maintenance Manual, which describes the ISEIS software from the programmer's perspective and provides information for maintenance and modification of the software modules in the system.

Download or read book Cross Region Analysis Path Corrections and the Transportability of Regional Seismic Discriminants written by Douglas R. Baumgardt and published by . This book was released on 1995 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study has investigated the problem of transporting regional discriminants, principally the regional P/S amplitude ratio and Lg spectral discriminants, between regions of differing tectonic type. The effects of differential regional phase attenuation and propagation blockages need to be taken into account and corrected before decision criteria for discriminants developed in one tectonic region can be transported to a different tectonic region. We have developed a set of frequency-dependent distance correction curves to correct the Pn/Sn and Pn/Lg amplitude ratio to a standard distance. Similar corrections have been developed for the Lg spectral ratio using a standard Lg attenuation model. Also, we have developed a method, called cross-region seismic event characterization, to characterize and identify new events which occur in aseismic regions or regions lacking known source types. Discrimination processing results of the Intelligent Seismic Event Identification System (ISEIS) for many different regions are stored in an Oracle database and can be called up on a regionalized basis. When a new event occurs, the method of cross-region seismic event characterization tries to find reference events from different regions, probably recorded at different stations than the new event, but at comparable distance for comparison which can be used as reference or training events to identify the new event. We construct crustal cross sections for the different propagation paths and determine if the new event has similar cross sections as the reference events. If the paths are not too different, the discriminants can be directly compared, after correcting for differences in distance.

Download or read book Test and Evaluation of Neural Network Applications for Seismic Signal Discrimination written by and published by . This book was released on 1992 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study describes operational test and evaluation of two neural network applications that were integrated into the Intelligent Monitoring System (IMS) for automated processing and interpretation of regional seismic data. Also reported is the result of a preliminary study on the application of neural networks to regional seismic event identification. The first application is for initial identification of seismic phases (P or S) recorded by 3-component stations based on polarization data and context. This neural network performed 3-6% better than the current rule-based system when tested on data obtained from the 3-component IRIS stations in the former Soviet Union. This resulted in an improved event bulletin which showed that the number of analyst-verified events that were missed by the automated processing decreased by more than a factor of 2 (about 10 events/week). The second operational test was conducted on the neural network developed by MIT/Lincoln Laboratory for regional final phase identification (e.g., Pn, Pg, Sn, Lg, and Rg). This neural network performed 3. 3% better than the rule-based system in IMS station processing. However, for the final phase identifications obtained after network processing (where data from all stations are combined), the gain dropped to about 1.0%. It is likely that this could be regained by using the neural network phase identification confidence factors in the network processing. Finally, our preliminary study on the application of neural networks to identify regional seismic events on the basis of coda shape gave about 80% accuracy on data recorded at GERESS. In general, the neural network classifier utilized the coda decay rate which was lower for the earthquakes than it was for the explosions, although there was substantial overlap.

Download or read book Regional Characterization of Mine Blasts Earthquakes Mine Tremors and Nuclear Explosions Using the Intelligent Seismic Event Identification System written by and published by . This book was released on 1993 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of a study of the Intelligent Seismic Event Identification System (ISEIS) which was installed at the Center for Seismic Studies and applied to regional events in the Intelligent Monitoring System (IMS) database. A subset of IMS data has been collected for known events in a database called the Ground Truth Database (GTD) and these events were processed by ISEIS. This has shown that the regional high-frequency PIS ratio discriminates between explosions and earthquakes in the Vogtland region recorded at the GERESSS array. Mine tremors in the Lubin and Upper Silesia resemble earthquakes. Lg spectral ratio was found to separate explosions and earthquakes in the Vogtland region, but the Lubin and Upper Silesia region mine tremors had large scatter. An evaluation was made of the discrimination rules in the ISEIS expert system on the events in four regions (Vogtland. Lubin, Upper Silesia, and Steigen) in the GTD. This report also describes the results of the analysis of the December 31, 1992 event which occurred near the Russian test site on Novaya Zemlya. Analysis of Pn/Sn ratios at NORESS indicated that these ratios were comparable to those measured for Kola Peninsula mine blasts, although the propagation paths were different. The ratios were only slightly greater than those observed for earthquakes in the Greenland Sea. The August 1. 1986 event recorded was re-analyzed and also found to resemble mine blasts. However, other discriminants indicate that the event was probably an earthquake.

Download or read book Intelligent Event Identification System Volume 3 Software Maintenance Manual written by and published by . This book was released on 1991 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project is to design and develop an Intelligent Event Identification System, or ISEIS, which will be a prototype for routine event identification of small explosions and earthquakes and to serve as a tool for discrimination research. The first part of this study gives an overview of the system design and the results of a preliminary evaluation of the system on events in Scandinavia and the Soviet Union. The system was designed to be highly modular to allow the easy incorporation of new discriminants and/or discrimination processes. Because the main objective of the system is the identification of small events, most of the initial ISEIS prototype discriminants utilize regional seismic data recorded by the regional arrays, NORESS and ARCESS. However, ISEIS can easily process other regional array data (e.g., from GERESS and FINESA), as well as data from three-component single stations, as more of this data becomes available. The second part of this study is entitled Intelligent Event Identification System: User's Manual, and gives a detailed description of all the processing interfaces of ISEIS. The third part of this study is entitled Intelligent Event Identification System: Software Maintenance Manual, which describes the ISEIS software from the programmer's perspective and provides information for maintenance and modification of the software modules in the system.

Download or read book Detection Location and Identification of Explosions and Earthquakes Using Regional Seismic Data Recorded at a Single Station written by J. R. Murphy and published by . This book was released on 1981 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the results of an analysis of the various factors affecting the detection, location and event identification capability of a single seismic station in the regional distance range. A regional seismic detection model is described in Section II where it is applied to the evaluation of the frequency dependent detectability of underground explosions in various source media. On the basis of these analyses it is concluded that P waves from explosions with yields as small as 1 kt should be detectable at ranges on the order of 1000 km or more over regional propagation paths characteristic of the Eastern U.S. Event location capability associated with single station seismic data is assessed in Section III where it is concluded that epicentral distance accuracies on the order of 10 to 15 km and source azimuth accuracies of better than 10 degrees are achievable using routinely available data processing procedures. Single station, regional event discrimination capability is reviewed in Section IV where it is concluded that, although questions remain concerning the reliability of simple regional phase amplitude ratio discriminants (e.g. L sub g/P), available evidence suggests that regional versions of the M sub s/m sub b and short-period P wave spectral discriminants generally provide good event separation when applied to single station data. (Author).

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1993 with total page 1768 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Statistical Framework for Event Identification and Assessment of Seismic CTBT Monitoring Capability written by Mark D. Fisk and published by . This book was released on 1995 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This effort focuses on several main areas regarding event identification within the context of CTBT monitoring: (1) development and integration at the Center for Monitoring Research (CMR) of a software system for event characterization/identification; (2) assessment of regional seismic event identification performance; (3) analysis of GSETT-3 Alpha network data to assess the availability and utility of event characterization parameters for global monitoring; and (4) investigation of robust multi-sensor data fusion techniques for outlier detection and event classification. We have been implementing a statistical event identification framework. The fundamental methods consist of statistical tests for outlier detection and event classification, as well as algorithms to test appropriate assumptions regarding the data in order to optimize and ensure validity of the results. Our methodology: (1) accurately treats statistical uncertainties of all discriminants used; (2) provides flexibility to incorporate any discriminant and assess its utility objectively; (3) can identify nuclear tests in regions for which relevant ground-truth training data may or may not exist; (4) can function in an automated mode to flag, categorize and/or rank anomalous events; (5) can control the false alarm rate; (6) and provides a rigorous and defensible framework with which to report and justify the results. To also serve as an interactive analysis tool, we have been developing an X Window graphical user interface, featuring a wide range of displays and exploratory data analysis tools. We have applied the methods to seismic events recorded by the ARCESS and GERESS arrays, station WMQ in China, and stations KNB and MNV in the western U.S.

Download or read book Intelligent Systems Design and Applications written by Ajith Abraham and published by Springer Nature. This book was released on 2023-05-31 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights recent research on intelligent systems and nature-inspired computing. It presents 223 selected papers from the 22nd International Conference on Intelligent Systems Design and Applications (ISDA 2022), which was held online. The ISDA is a premier conference in the field of computational intelligence, and the latest installment brought together researchers, engineers, and practitioners whose work involves intelligent systems and their applications in industry. Including contributions by authors from 65 countries, the book offers a valuable reference guide for all researchers, students, and practitioners in the fields of computer science and engineering.

Download or read book A Discrimination Analysis of Regional Seismic Data Recorded at Tonto Forest Observatory from Nevada Test Site Explosions and Nearby Earthquakes written by J. R. Murphy and published by . This book was released on 1981 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal objectives of the research reported here are to identify any diagnostic differences between regional seismic phases produced by earthquakes and underground nuclear explosions and to assess their applicability to events occurring in various regions of the U.S.S.R. Two approaches are used: one employs traditional time-domain amplitude and period measurements to compare the relative excitation of various regional phases for earthquakes and explosions, while the second focuses on more sophisticated measurement or processing techniques such as spectral ratios or narrow-band filtering to extract information about frequency differences in the signals generated by the two types of events. The research reported here was directed at identification of discriminants based on measurements of seismic phases at regional distances from a well-controlled set of Western U.S. explosions and nearby earthquakes. The set includes more than 50 Nevada Test Site events (explosions and nearby earthquakes) recorded at the Tonto Forest Observatory in Arizona. The investigation included spectral analyses of the short-period regional phases, Pn, Pg, and Lg which follows-up a previously reported study of time-domain characteristics of these phases. In addition, the current study includes an analysis of the time-domain characteristics of the long-period data from the Nevada Test Site event set, with particular emphasis on the potential applicability of the Ms/mb discriminant to the identification of small events (mb

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 ICT with Intelligent Applications written by Jyoti Choudrie and published by Springer Nature. This book was released on 2022-09-30 with total page 827 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers papers addressing state-of-the-art research in all areas of information and communication technologies and their applications in intelligent computing, cloud storage, data mining and software analysis. It presents the outcomes of the Sixth International Conference on Information and Communication Technology for Intelligent Systems (ICTIS 2022), held in Ahmedabad, India. The book is divided into two volumes. It discusses the fundamentals of various data analysis techniques and algorithms, making it a valuable resource for researchers and practitioners alike.