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...

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Main Authors: Murphy, John R., Barker, Brian W., Sultanov, Jamil D.
Other Authors: SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
Format: Text
Language:English
Published: 2007
Subjects:
A1
Online Access:http://www.dtic.mil/docs/citations/ADA476377
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA476377
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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.
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