Download or read book Automated Seismic Event Monitoring System written by I. E. Henson and published by . This book was released on 2001-09-01 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automated Seismic Event Monitoring System Addendum 1 NUREG written by U.S. Nuclear Regulatory Commission and published by . This book was released on 2001* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automated Seismic Event Monitoring System written by Ivan Hendrix Henson and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automated Seismic Event Monitoring System Addendum 1 NUREG CR 6625 Addendum 1 U S Nuclear Regulatory Commission written by and published by . This book was released on 2001* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automated Seismic Event Location by Waveform Coherence Analysis written by Francesco Grigoli and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Automated location of seismic events is a very important task in microseismic monitoring operations as well for local and regional seismic monitoring. Since microseismic records are generally characterised by low signal-to-noise ratio, such methods are requested to be noise robust and sufficiently accurate. Most of the standard automated location routines are based on the automated picking, identification and association of the first arrivals of P and S waves and on the minimization of the residuals between theoretical and observed arrival times of the considered seismic phases. Although current methods can accurately pick P onsets, the automatic picking of the S onset is still problematic, especially when the P coda overlaps the S wave onset. In this thesis I developed a picking free automated method based on the Short-Term-Average/Long-Term-Average (STA/LTA) traces at different stations as observed data. I used the STA/LTA of several characteristic functions in order to increase the sensitiveness to the P wave and the S waves. For the P phases we use the STA/LTA traces of the vertical energy function, while for the S phases, we use the STA/LTA traces of the horizontal energy trace and then a more optimized characteristic function which is obtained using the principal component analysis technique. The orientation of the horizontal components can be retrieved by robust and linear approach of waveform comparison between stations within a network using seismic sources outside the network (chapter 2). To locate the seismic event, we scan the space of possible hypocentral locations and origin times, and stack the STA/LTA traces along the theoretical arrival time surface for both P and S phases. Iterating this procedure on a three-dimensional grid we retrieve a multidimensional matrix whose absolute maximum corresponds to the spatial and temporal coordinates of the seismic event. Location uncertainties are then estimated by perturbing the STA/LTA parameters (i.e the length of both long and short time windows) and relocating each event several times. In order to test the location method I firstly applied it to a set of 200 synthetic events. Then we applied it to two different real datasets. A first one related to mining induced microseismicity in a coal mine in the northern Germany (chapter 3). In this case we successfully located 391 microseismic event with magnitude range between 0.5 and 2.0 Ml. To further validate the location method I compared the retrieved locations with those obtained by manual picking procedure. The second dataset consist in a pilot application performed in the Campania-Lucania region (southern Italy) using a 33 stations seismic network (Irpinia Seismic Network) with an aperture of about 150 km (chapter 4). We located 196 crustal earthquakes (depth
Download or read book Advances in Seismic Event Location written by Cliffort H. Thurber and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Seismic Event Location provides a broad overview of the fundamental issues involved in seismic event location, and presents a variety of state-of-the-art location methods and applications at a wide range of spatial scales. Three important themes in the book are: seismic monitoring for a Comprehensive Nuclear-Test-Ban Treaty (CTBT), seismic event location in three-dimensional Earth models, and methods for multiple-event location. Each chapter contains background material to help readers less familiar with the topics covered, as well as to provide abundant references for readers interested in probing deeper into a topic. However, most of the emphasis is on recent advances in methodology and their application. Audience: The book is intended primarily for academic and professional researchers and graduate students in seismology.
Download or read book Automatic Tools for Seismic Monitoring Systems written by Conny Hammer and published by . This book was released on 2012 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Passive Seismic Monitoring of Induced Seismicity written by David W. Eaton and published by Cambridge University Press. This book was released on 2018-04-26 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the principles and applications of passive seismic monitoring, providing an accessible overview of current research and technology.
Download or read book Requirement for an Advanced National Seismic System written by and published by Geological Survey (USGS). This book was released on 1999 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Automated Local regional Seismic Event Detection and Location System Using Waveform Correlation written by Michell M. Withers and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microseismic Monitoring written by Vladimir Grechka and published by SEG Books. This book was released on 2017-09-01 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, microseismic monitoring, a technology developed for evaluating completions of wells drilled to produce hydrocarbons from unconventional reservoirs, has grown increasingly popular among oil and gas companies. Microseismic Monitoring, by Vladimir Grechka and Werner M. Heigl, discusses how to process microseismic data, what can and cannot be inferred from such data, and to what level of certainty this might be possible. The narrative of the book follows the passage of seismic waves: from a source triggered by hydraulic fracture stimulation, through hydrocarbon-bearing formations, towards motion sensors. The waves’ characteristics encode the location of their source and its focal mechanism. The analysis of various approaches to harvesting the source-related information from microseismic records has singled out the accuracy of the velocity model, fully accounting for the strong elastic anisotropy of hydraulically fractured shales, as the most critical ingredient for obtaining precise source locations and interpretable moment tensors. The ray theory complemented by its modern extensions, paraxial and Fréchet ray tracing, provides the only practical means available today for building such models. The book is written for geophysicists interested in learning and applying advanced microseismic data-processing techniques.
Download or read book An Automated Local regional Seismic Event Detection and Location System Using Waveform Correlation written by Michell M. Withers and published by . This book was released on 1997 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earthquake Monitoring and Seismic Hazard Mitigation in Balkan Countries written by Eystein S. Husebye and published by Springer Science & Business Media. This book was released on 2008-03-01 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Balkans are seismically the most active part of Europe due to plate interactions in the Aegean Sea. This book gives a good account of past, present and likely future seismological developments in this area. It describes the tectonic evolution and on-going geodynamic deformations. Coverage also discusses earthquake hazard analysis, topographic site effects, and examines large earthquake hazards in the Aegean and the Marmara seas as practical applications of such procedures.
Download or read book Design of a New Macroseismic Monitoring System written by A. Makuch and published by Energy, Mines and Resources Canada, CANMET, Canada Centre for Mineral and Energy Technology. This book was released on 1987 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development, as part of the Canada/Ontario/Industry agreement onrockburst research in Ontario mines, of a system which would be capable of capturing thecomplete seismic waveform from rockbursts, including first motion of failure, peak particle velocity, frequency analysis, event magnitude and sourcelocation. The first of these systems was installed atStrathcona mine in Sudbury with details being given on the system design andcomponents, as well as the analysis system used at the Elliot Lakelaboratory.
Download or read book Seismic Monitoring System Calibration Using Ground Truth Database written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Calibration of a seismic monitoring system remains a major issue due to the lack of ground truth information and uncertainties in the regional geological parameters. Rapid and accurate identification of seismic events is currently not feasible due to the absence of a fundamental framework allowing immediate access to ground truth information for many parts of the world. Precise location and high-confidence identification of regional seismic events are the primary objectives of monitoring research in seismology. In the Department of Energy Knowledge Base (KB), ground truth information addresses these objectives and will play a critical role for event relocation and identification using advanced seismic analysis tools. Maintaining the KB with systematic compilation and analysis of comprehensive sets of geophysical data from various parts of the world is vital. The goal of this project is to identify a comprehensive database for China using digital seismic waveform data that are currently unavailable. These data may be analyzed along with ground truth information that becomes available. To date, arrival times for all regional phases are determined on all events above Mb 4.5 that occurred in China in 2000 and 2001. Travel-time models are constructed to compare with existing models. Seismic attenuation models may be constructed to provide better understanding of regional wave propagation in China with spatial resolution that has not previously been obtained.
Download or read book An Automated Approach for the Determination of the Seismic Moment Tensor in Mining Environments written by Lawrence R. Wamboldt and published by . This book was released on 2012 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was undertaken to evaluate an automated process to invert for seismic moment tensors from seismic data recorded in mining environments. The data for this study was recorded at Nickel Rim South mine, Sudbury, Ontario. The mine has a seismic monitoring system manufactured by ESG Solutions that performs continuous monitoring of seismicity. On average, approximately 400 seismic events are recorded each day. Currently, data are automatically processed by ESG Solution's software suite during acquisition. The automatic processors pick the P- and/or S-wave arrivals, locate the events and solve for certain source parameters, excluding the seismic moment tensor. In order to solve for the moment tensor, data must be manually processed, which is laborious and therefore seldom performed. This research evaluates an automatic seismic moment tensor inversion method and demonstrates some of the difficulties (through inversions of real and synthetic seismic data) of the inversion process. Results using the method are also compared to the inversion method currently available from ESG Solutions, which requires the manual picking of first-motion polarities for every event. As a result of the extensive synthetic testing of the automatic inversion program, as well as the inversion of real seismic data, it is apparent that there are key parameters requiring greater accuracy in order to increase the reliability of the automation. These parameters include the source time function definition, source location (in turn requiring more accurate and precise knowledge of the earth media), arrival time picks and an attenuation model to account for ray-path dependent filtering of the source time function. In order to improve the automatic method three key pieces of research are needed: (1) studying various location algorithms (and the effects of increasing earth model intricacy) and automatic time picking to improve source location methods, (2) studying how the source time pulse can be accurately extracted from the seismic records, as well as the validity of various source models, and (3) studying how attenuation can be modeled more accurately to account for the filtering of the seismic waves through the earth media (in particular distortion to the source time function).
Download or read book Seismological Research Requirements for a Comprehensive Test Ban Monitoring System written by National Research Council and published by National Academies Press. This book was released on 1995-12-13 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Negotiators from more than 35 countries are attempting to formulate a nuclear test-ban treaty and delineate a system from monitoring compliance. This book covers: (1) the desirable characteristics and capabilities of seismic monitoring stations; (2) recommendations on the flow paths and handling of the data, which are to be unclassified; and (3) the types and extent of research that will be needed in the next decade. The primary focus of the book is to explore how basic seismological research and test ban monitoring can be mutually beneficial.
