A Scaling Analysis of Frequency Dependent Energy Partition for Local and Regional Seismic Phases from Explosions
Seismic identification of small explosions relies on the application of discriminants that are effective in the regional distance range. The most reliable regional discriminants identified to date are those based on high frequency spectral ratios of the amplitudes of the regional shear phases Sn and...
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
2007
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/ADA476377 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA476377 |
id |
ftdtic:ADA476377 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:ADA476377 2023-05-15T17:47:15+02:00 A Scaling Analysis of Frequency Dependent Energy Partition for Local and Regional Seismic Phases from Explosions Murphy, John R. Barker, Brian W. Sultanov, Jamil D. SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA 2007-08-31 text/html http://www.dtic.mil/docs/citations/ADA476377 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA476377 en eng http://www.dtic.mil/docs/citations/ADA476377 Approved for public release; distribution is unlimited. DTIC Explosions Nuclear Weapons *NUCLEAR EXPLOSIONS *UNDERGROUND EXPLOSIONS *SEISMIC WAVES SHEAR PROPERTIES SIGNAL PROCESSING IDENTIFICATION STATISTICAL ANALYSIS SCALING FACTOR ALGEBRA ENERGY DATA PROCESSING *FREQUENCY DEPENDENCE *SEISMIC PHASES *S WAVES SHEAR WAVES SOURCE SCALING SEMIPALATINSK LOP NOR NOVAYA ZEMLYA NTS(NEVADA TEST SITE) MUELLER/MURPHY DISCRIMINANTS PE62601F A1 Text 2007 ftdtic 2016-02-22T13:24:16Z Seismic identification of small explosions relies on the application of discriminants that are effective in the regional distance range. The most reliable regional discriminants identified to date are those based on high frequency spectral ratios of the amplitudes of the regional shear phases Sn and Lg to those of the corresponding direct P phases Pn and Pg. However, the universal applicability of such discriminants remains in question because there is currently no physical model of S wave generation by explosions that has been shown to be quantitatively consistent with the range of available observations. The objectives of this research program have been to determine frequency dependent source scaling relations for observed regional P and S phases through statistical analysis of data recorded from underground nuclear explosions conducted at a variety of different test sites, and to apply these derived scaling relations to a quantitative evaluation of the credibility of various proposed source mechanisms for generation of the regional shear phases Sn and Lg observed from underground explosion sources. The source scaling results obtained have been found to be remarkably consistent, indicating that the observed Sn and Lg spectra scale with yield in a manner which is very comparable to that of the corresponding direct Pn spectra, generally differing significantly over narrow frequency bands defined by differences in the P and S wave corner frequencies. These results provide strong constraints which must be satisfied by any plausible proposed physical mechanism of explosion S wave generation. Prepared in cooperation with the Institute for Dynamics of the Geospheres, Russian Academy of Sciences. Text Novaya Zemlya Defense Technical Information Center: DTIC Technical Reports database Mueller ENVELOPE(55.533,55.533,-66.917,-66.917) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Explosions Nuclear Weapons *NUCLEAR EXPLOSIONS *UNDERGROUND EXPLOSIONS *SEISMIC WAVES SHEAR PROPERTIES SIGNAL PROCESSING IDENTIFICATION STATISTICAL ANALYSIS SCALING FACTOR ALGEBRA ENERGY DATA PROCESSING *FREQUENCY DEPENDENCE *SEISMIC PHASES *S WAVES SHEAR WAVES SOURCE SCALING SEMIPALATINSK LOP NOR NOVAYA ZEMLYA NTS(NEVADA TEST SITE) MUELLER/MURPHY DISCRIMINANTS PE62601F A1 |
spellingShingle |
Explosions Nuclear Weapons *NUCLEAR EXPLOSIONS *UNDERGROUND EXPLOSIONS *SEISMIC WAVES SHEAR PROPERTIES SIGNAL PROCESSING IDENTIFICATION STATISTICAL ANALYSIS SCALING FACTOR ALGEBRA ENERGY DATA PROCESSING *FREQUENCY DEPENDENCE *SEISMIC PHASES *S WAVES SHEAR WAVES SOURCE SCALING SEMIPALATINSK LOP NOR NOVAYA ZEMLYA NTS(NEVADA TEST SITE) MUELLER/MURPHY DISCRIMINANTS PE62601F A1 Murphy, John R. Barker, Brian W. Sultanov, Jamil D. A Scaling Analysis of Frequency Dependent Energy Partition for Local and Regional Seismic Phases from Explosions |
topic_facet |
Explosions Nuclear Weapons *NUCLEAR EXPLOSIONS *UNDERGROUND EXPLOSIONS *SEISMIC WAVES SHEAR PROPERTIES SIGNAL PROCESSING IDENTIFICATION STATISTICAL ANALYSIS SCALING FACTOR ALGEBRA ENERGY DATA PROCESSING *FREQUENCY DEPENDENCE *SEISMIC PHASES *S WAVES SHEAR WAVES SOURCE SCALING SEMIPALATINSK LOP NOR NOVAYA ZEMLYA NTS(NEVADA TEST SITE) MUELLER/MURPHY DISCRIMINANTS PE62601F A1 |
description |
Seismic identification of small explosions relies on the application of discriminants that are effective in the regional distance range. The most reliable regional discriminants identified to date are those based on high frequency spectral ratios of the amplitudes of the regional shear phases Sn and Lg to those of the corresponding direct P phases Pn and Pg. However, the universal applicability of such discriminants remains in question because there is currently no physical model of S wave generation by explosions that has been shown to be quantitatively consistent with the range of available observations. The objectives of this research program have been to determine frequency dependent source scaling relations for observed regional P and S phases through statistical analysis of data recorded from underground nuclear explosions conducted at a variety of different test sites, and to apply these derived scaling relations to a quantitative evaluation of the credibility of various proposed source mechanisms for generation of the regional shear phases Sn and Lg observed from underground explosion sources. The source scaling results obtained have been found to be remarkably consistent, indicating that the observed Sn and Lg spectra scale with yield in a manner which is very comparable to that of the corresponding direct Pn spectra, generally differing significantly over narrow frequency bands defined by differences in the P and S wave corner frequencies. These results provide strong constraints which must be satisfied by any plausible proposed physical mechanism of explosion S wave generation. Prepared in cooperation with the Institute for Dynamics of the Geospheres, Russian Academy of Sciences. |
author2 |
SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA |
format |
Text |
author |
Murphy, John R. Barker, Brian W. Sultanov, Jamil D. |
author_facet |
Murphy, John R. Barker, Brian W. Sultanov, Jamil D. |
author_sort |
Murphy, John R. |
title |
A Scaling Analysis of Frequency Dependent Energy Partition for Local and Regional Seismic Phases from Explosions |
title_short |
A Scaling Analysis of Frequency Dependent Energy Partition for Local and Regional Seismic Phases from Explosions |
title_full |
A Scaling Analysis of Frequency Dependent Energy Partition for Local and Regional Seismic Phases from Explosions |
title_fullStr |
A Scaling Analysis of Frequency Dependent Energy Partition for Local and Regional Seismic Phases from Explosions |
title_full_unstemmed |
A Scaling Analysis of Frequency Dependent Energy Partition for Local and Regional Seismic Phases from Explosions |
title_sort |
scaling analysis of frequency dependent energy partition for local and regional seismic phases from explosions |
publishDate |
2007 |
url |
http://www.dtic.mil/docs/citations/ADA476377 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA476377 |
long_lat |
ENVELOPE(55.533,55.533,-66.917,-66.917) |
geographic |
Mueller |
geographic_facet |
Mueller |
genre |
Novaya Zemlya |
genre_facet |
Novaya Zemlya |
op_source |
DTIC |
op_relation |
http://www.dtic.mil/docs/citations/ADA476377 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766151613984014336 |