Seismic Moment Tensor Report For The 06 Aug 2007 M39 Seismic Event In Central Utah
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Total Pages | : 12 |
Release | : 2007 |
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Download Seismic Moment Tensor Report for the 06 Aug 2007, M3.9 Seismic Event in Central Utah Book in PDF, Epub and Kindle
We have performed a complete moment tensor analysis (Minson and Dreger, 2007) of the seismic event, which occurred on Monday August 6, 2007 at 08:48:40 UTC, 21 km from Mount Pleasant, Utah. The purpose of this report is to present our scientific results, making them available to other researchers working on seismic source determination problems, and source type identification. In our analysis we used complete, three-component seismic records recorded by stations operated by the USGS, the University of Utah and EarthScope. The results of our analysis show that most of the seismic wave energy is consistent with an underground collapse, however the cause of the mine collapse is still unknown.
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Total Pages | : 7 |
Release | : 2007 |
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Download Berkeley Seismological Laboratory Seismic Moment Tensor Report for the August 6, 2007 M3.9 Seismic Event in Central Utah Book in PDF, Epub and Kindle
We have performed a complete moment tensor analysis of the seismic event, which occurred on Monday August 6, 2007 at 08:48:40 UTC 21 km from Mt. Pleasant, Utah. In our analysis we utilized complete three-component seismic records recorded by the USArray, University of Utah, and EarthScope seismic arrays. The seismic waveform data was integrated to displacement and filtered between 0.02 to 0.10 Hz following instrument removal. We used the Song et al. (1996) velocity model to compute Green's functions used in the moment tensor inversion. A map of the stations we used and the location of the event is shown in Figure 1. In our moment tensor analysis we assumed a shallow source depth of 1 km consistent with the shallow depth reported for this event. As shown in Figure 2 the results point to a source mechanism with negligible double-couple radiation and is composed of dominant CLVD and implosive isotropic components. The total scalar seismic moment is 2.12e22 dyne cm corresponding to a moment magnitude (Mw) of 4.2. The long-period records are very well matched by the model (Figure 2) with a variance reduction of 73.4%. An all dilational (down) first motion radiation pattern is predicted by the moment tensor solution, and observations of first motions are in agreement.
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Total Pages | : 8 |
Release | : 2008 |
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Download Source Characterization of the 6 August 2007 Crandall Canyon Mine Seismic Event in Central Utah Book in PDF, Epub and Kindle
This paper describes regional distance moment tensor analysis of seismic waves generated by the Crandall Canyon Mine collapse.
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Total Pages | : 31 |
Release | : 2008 |
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Download Source Characterization of the August 6, 2007 Crandall Canyon Mine Seismic Event in Central Utah Book in PDF, Epub and Kindle
On August 6, 2007 a local magnitude 3.9 seismic event occurred at 08:48:40 UTC in central Utah. The epicenter is within the boundaries of the Crandall Canyon coal mine (c.f. Pechmann and others, this volume). We performed a moment tensor analysis with complete, three-component seismic recordings from stations operated by the USGS, the University of Utah, and EarthScope. The analysis method inverts the seismic records to retrieve the full seismic moment tensor, which allows for interpretation of both shearing (e.g., earthquakes) and volume-changing (e.g., explosions and collapses) seismic events. The results show that most of the recorded seismic wave energy is consistent with an underground collapse in the mine. We contrast the waveforms and moment tensor results of the Crandall Canyon Mine seismic event to a similar sized tectonic earthquake about 200 km away near Tremonton, Utah, that occurred on September 1, 2007. Our study does not address the actual cause of the mine collapse.
Author | : Jan Holnicki-Szulc |
Publisher | : Springer Science & Business Media |
Total Pages | : 408 |
Release | : 1999-02-28 |
Genre | : Science |
ISBN | : 9780792356134 |
Download Smart Structures Book in PDF, Epub and Kindle
Smart (intelligent) structures have been the focus of a great deal of recent research interest. In this book, leading researchers report the state of the art and discuss new ideas, results and trends in 43 contributions, covering fundamental research issues, the role of intelligent monitoring in structural identification and damage assessment, the potential of automatic control systems in achieving a desired structural behaviour, and a number of practical issues in the analysis and design of smart structures in mechanical and civil engineering applications. Audience: A multidisciplinary reference for materials scientists and engineers in such areas as mechanical, civil, aeronautical, electrical, control, and computer engineering.
Author | : Michael J. Branney |
Publisher | : Geological Society of London |
Total Pages | : 156 |
Release | : 2002 |
Genre | : Science |
ISBN | : 9781862391246 |
Download Pyroclastic Density Currents and the Sedimentation of Ignimbrites Book in PDF, Epub and Kindle
Author | : Nori Nakata |
Publisher | : Cambridge University Press |
Total Pages | : 373 |
Release | : 2019-03-21 |
Genre | : Nature |
ISBN | : 1108417086 |
Download Seismic Ambient Noise Book in PDF, Epub and Kindle
A comprehensive overview of seismic ambient noise, covering observations, physical origins, modelling, processing methods and applications in imaging and monitoring.
Author | : Robert G. H. Raynolds |
Publisher | : Geological Society of America |
Total Pages | : 318 |
Release | : 2008-01-01 |
Genre | : Science |
ISBN | : 0813700108 |
Download Roaming the Rocky Mountains and Environs Book in PDF, Epub and Kindle
Prepared following the 2007 GSA Annual Meeting in Denver, Colorado, these 15 guides illustrate the latest geological and archeological thinking on a variety of current research themes.
Author | : P. Melchior |
Publisher | : Springer Science & Business Media |
Total Pages | : 443 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9400952732 |
Download Seismic Activity in Western Europe Book in PDF, Epub and Kindle
A damaging earthquake with intensity VII MSK and local magni= tude 5. 1 occurred on November 8, 1983, at 0:49 GMT near the Belgium town of Liege in the border region between Belgium, Germany and the Netherlands. This most severe earthquake in the northwestern part of Central Europe since more than thirty years has well been recorded by the dense seismic station network in West Germany which consists of more than twenty stations situated in the Lower Rhine Embayment and in the adjoining Rhenish Massif. Most of the stations are equipped with modern digital recording systems. Thus high-quality seismograms are available from the region east and southeast of the epicenter covering a distance range between 70 km and 144 km. From these data the source characteristics of the Liege mainshock and of its largest after= shock have been determined in order to get more information on the seismotectonic processes causing the Liege events. 2. Seismic Station Network During the period of 1976 to 1982 the seismic station network in the Lower Rhine Embayment and in the Rhenish Massif was consi= derably enlarged and mostly equipped with digital recording systems (Figure 1). At present there are more than twenty stations in operation. Most of them are operated by the Department of Earthquake Geology of the Geological Institute of the University of Cologne and the Geo= logical Survey of Nordrhein-Westfalen at Krefeld.
Author | : Dirk Puetzfeld |
Publisher | : Springer |
Total Pages | : 479 |
Release | : 2019-02-09 |
Genre | : Science |
ISBN | : 3030115003 |
Download Relativistic Geodesy Book in PDF, Epub and Kindle
Due to steadily improving experimental accuracy, relativistic concepts – based on Einstein’s theory of Special and General Relativity – are playing an increasingly important role in modern geodesy. This book offers an introduction to the emerging field of relativistic geodesy, and covers topics ranging from the description of clocks and test bodies, to time and frequency measurements, to current and future observations. Emphasis is placed on geodetically relevant definitions and fundamental methods in the context of Einstein’s theory (e.g. the role of observers, use of clocks, definition of reference systems and the geoid, use of relativistic approximation schemes). Further, the applications discussed range from chronometric and gradiometric determinations of the gravitational field, to the latest (satellite) experiments. The impact of choices made at a fundamental theoretical level on the interpretation of measurements and the planning of future experiments is also highlighted. Providing an up-to-the-minute status report on the respective topics discussed, the book will not only benefit experts, but will also serve as a guide for students with a background in either geodesy or gravitational physics who are interested in entering and exploring this emerging field.