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Discrepancies Between Prototype International Data Centre International Seismological Centre Usgs Seismic Magnitudes
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Book Synopsis Discrepancies Between Prototype International Data Centre, International Seismological Centre & USGS Seismic Magnitudes by :
Download or read book Discrepancies Between Prototype International Data Centre, International Seismological Centre & USGS Seismic Magnitudes written by and published by . This book was released on 2007 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: A discrepancy between body-wave magnitudes, from the Prototype International Data Centre (PIDC) and the U.S. Geological Survey (USGS), has persisted since 1995, and amounts to a few tenths of a magnitude unit. Since 1999 we have studied the discrepancy between magnitudes published by different agencies and this final report is comprised of two sections. The first, is a stand-alone paper (published in the 2002 November/December issue of the Seismological Society of America's Seismological Review Letters) comparing the PIDC magnitudes with values assigned by a method that as closely as possible reproduces the Veith-Clawson protocol for reporting seismic body wave magnitudes. That protocol is the most clearly specified, or many different body-wave magnitude scales. The second section here, is a report which documents in detail the actual discrepancies between magnitudes assigned by three key agencies - namely, the USGS, the PIDC, and the International Seismological Centre (ISC).
Book Synopsis Discrepancies Between PIDC, ISC, and USGS Seismic Magnitudes by :
Download or read book Discrepancies Between PIDC, ISC, and USGS Seismic Magnitudes written by and published by . This book was released on 2001 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We seek first to document and then to explain the well-known systematic differences between magnitudes (mb) assigned by the PIDC, ISC, and USGS. To do this, we first obtain "classical magnitudes" that as far as possible reproduce the instrumentation and procedures associated with the Veith-Clawson magnitude scale. Though others claim to assign such magnitudes using broadband data, current practice is notably different from the actual Veith-Clawson protocol, and uses measurements made from narrow-band filtered data derived from broadband instruments. We obtain classical magnitudes by making time-domain measurements using WWSSN seismograms simulated from broadband waveforms, thus allowing us to maintain consistency with the original Veith-Clawson magnitude scale. We have obtained Veith-Clawson body-wave magnitudes using simulated WWSSN short-period signals for 21 earthquakes in 1998 and 1999. All of these events have a Veith-Clawson mb that is greater than the PIDC REB mb. The average discrepancy is 0.5 magnitude units. The discrepancy is at least 0.4 mb units for 71% of the station mb observations, with several observations having an offset greater than 1 magnitude unit. Note that the same broadband seismograms underlie these discrepant magnitude values, so this is not an issue of scatter in magnitudes derived from different seismograms. The choice of Gutenberg-Richter, or Veith-Clawson, for the distance correction factor does not strongly affect the resultant event magnitude. The depth assigned to an event by the USGS NEIC in its Preliminary Determination of Epicenters (PDE) is often greater than the depth given by the PIDC REB, especially for shallow events. This is partially due to the fact that the PIDC uses its default depth of 0 km for a significant number of events, rather than solving for an actual event depth. Since an increase in depth will result in a decrease in the magnitude [for a given measurement of log10(A/T) at a given distance, where A is amplitude.
Book Synopsis Survey of Practice in Determining Magnitudes of Near Earthquakes by :
Download or read book Survey of Practice in Determining Magnitudes of Near Earthquakes written by and published by . This book was released on 1977 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Improved Magnitude Measures for the International Data Centre by :
Download or read book Development of Improved Magnitude Measures for the International Data Centre written by and published by . This book was released on 2000 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many of the most important issues in nuclear test monitoring at the International Data Centre (IDC), such as event screening, depend critically on the details of the definitions of the various magnitude measures to be employed by the IDC and their relations to the classical National Earthquake Information Center, International Seismological Centre, and Air Force Technical Application Center magnitude measures, which have historically been used to assess seismic verification capability. Therefore, it is important that these IDC magnitude measures be well understood and carefully calibrated. During the past year, we have been continuing to refine the IDC mb and MS magnitude measures and have initiated an effort to implement an automated Lg-based magnitude measure for application to small, continental seismic events. The effort on mb has been directed toward incorporation of PKP observations into the generalized mb determination. A GLM statistical analysis has now been performed on the large sample of PKP amplitude measurements determined from the PIDC IMS station observations to obtain new distance corrections applicable over the PKP distance range. The resulting distance corrections have been compared both with those currently being employed at the IDC and with those previously derived by Lilwall (1987) and some significant differences have been noted. Moreover, the estimated uncertainties in these derived epicentral distance correction factors for PKP have been found to be comparable to or smaller than those previously estimated for the normal teleseismic P distance range. Thus it appears that incorporation of PKP data, will significantly reduce the nominal uncertainties in the network-averaged generalized mb values for at least some events. Current effort on this task is directed toward the evaluation of the applicability of the previously derived teleseismic P-wave station corrections to PKP observations at those same stations.
Book Synopsis Spring Meeting by : American Geophysical Union. Meeting
Download or read book Spring Meeting written by American Geophysical Union. Meeting and published by . This book was released on 1998 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismological Research Letters written by and published by . This book was released on 2001 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three Papers in Seismology by : Christopher Thomas Hayward
Download or read book Three Papers in Seismology written by Christopher Thomas Hayward and published by . This book was released on 1997 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Antarctica at the Close of a Millennium by : John Alan Gamble
Download or read book Antarctica at the Close of a Millennium written by John Alan Gamble and published by . This book was released on 2002 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanied by map in back inside cover pocket entitled: Geology of the Northern Vestfold Hills, East Antarctica, 1st ed., 2001.
Download or read book Bulletin written by and published by . This book was released on 2002 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frontline written by and published by . This book was released on 1998-05 with total page 1232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Research Required to Support Comprehensive Nuclear Test Ban Treaty Monitoring by : National Research Council
Download or read book Research Required to Support Comprehensive Nuclear Test Ban Treaty Monitoring written by National Research Council and published by National Academies Press. This book was released on 1997-08-01 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Instrumentation in Earthquake Seismology by : Jens Havskov
Download or read book Instrumentation in Earthquake Seismology written by Jens Havskov and published by Springer Science & Business Media. This book was released on 2010-02-11 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here is unique and comprehensive coverage of modern seismic instrumentation, based on the authors’ practical experience of a quarter-century in seismology and geophysics. Their goal is to provide not only detailed information on the basics of seismic instruments but also to survey equipment on the market, blending this with only the amount of theory needed to understand the basic principles. Seismologists and technicians working with seismological instruments will find here the answers to their practical problems. Instrumentation in Earthquake Seismology is written to be understandable to the broad range of professionals working with seismological instruments and seismic data, whether students, engineers or seismologists. Whether installing seismic stations, networks and arrays, working and calibrating stationary or portable instruments, dealing with response information, or teaching about seismic instruments, professionals and academics now have a practical and authoritative sourcebook. Includes: SEISAN and SEISLOG software systems that are available from http://extras.springer.com and http://www.geo.uib.no/seismo/software/software.html
Book Synopsis National Earthquake Resilience by : National Research Council
Download or read book National Earthquake Resilience written by National Research Council and published by National Academies Press. This book was released on 2011-09-09 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The United States will certainly be subject to damaging earthquakes in the future. Some of these earthquakes will occur in highly populated and vulnerable areas. Coping with moderate earthquakes is not a reliable indicator of preparedness for a major earthquake in a populated area. The recent, disastrous, magnitude-9 earthquake that struck northern Japan demonstrates the threat that earthquakes pose. Moreover, the cascading nature of impacts-the earthquake causing a tsunami, cutting electrical power supplies, and stopping the pumps needed to cool nuclear reactors-demonstrates the potential complexity of an earthquake disaster. Such compound disasters can strike any earthquake-prone populated area. National Earthquake Resilience presents a roadmap for increasing our national resilience to earthquakes. The National Earthquake Hazards Reduction Program (NEHRP) is the multi-agency program mandated by Congress to undertake activities to reduce the effects of future earthquakes in the United States. The National Institute of Standards and Technology (NIST)-the lead NEHRP agency-commissioned the National Research Council (NRC) to develop a roadmap for earthquake hazard and risk reduction in the United States that would be based on the goals and objectives for achieving national earthquake resilience described in the 2008 NEHRP Strategic Plan. National Earthquake Resilience does this by assessing the activities and costs that would be required for the nation to achieve earthquake resilience in 20 years. National Earthquake Resilience interprets resilience broadly to incorporate engineering/science (physical), social/economic (behavioral), and institutional (governing) dimensions. Resilience encompasses both pre-disaster preparedness activities and post-disaster response. In combination, these will enhance the robustness of communities in all earthquake-vulnerable regions of our nation so that they can function adequately following damaging earthquakes. While National Earthquake Resilience is written primarily for the NEHRP, it also speaks to a broader audience of policy makers, earth scientists, and emergency managers.
Book Synopsis Earthquake Early Warning Systems by : Paolo Gasparini
Download or read book Earthquake Early Warning Systems written by Paolo Gasparini and published by Springer Science & Business Media. This book was released on 2007-08-10 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides information on the major EEW systems in operation and on the state-of-the-art of the different blocks forming an EW system: the rapid detection and estimation of the earthquake’s focal parameters, the signal transmission, the engineering interface and the information reliability/false alarm problem. It is the first time that so many aspects of EEW systems have been specifically focused upon within a single book.
Book Synopsis The Directory of the World Landslide Inventory by : William Madison Brown
Download or read book The Directory of the World Landslide Inventory written by William Madison Brown and published by . This book was released on 1992 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geoinformatics by : A. Krishna Sinha
Download or read book Geoinformatics written by A. Krishna Sinha and published by Geological Society of America. This book was released on 2006-01-01 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The science of informatics in the broadest sense has been several thousands of years in the making. With the recent emergence of large storage devices and high-speed processing of data, it has become possible to organize vast amounts of data as digital products with ontologic tags and concepts for smart queries. Coupling this computational capability with earth science data defines the emerging field of geoinformatics. Since the science of geology was established several centuries ago, observations led to conclusions that were integrative in concept and clearly had profound implications for the birth of geology. As disciplinary information about Earth becomes more voluminous, the use of geoinformatics will lead to integrative, science-based discoveries of new knowledge about planetary systems. Twenty one research papers, co-authored by 96 researchers from both earth and computer sciences, provide the first-ever organized presentation of the science of informatics as it relates to geology. Readers will readily recognize the vast intellectual content represented by these papers as they seek to address the core research goals of geoinformatics."--Publisher's website.
