High Frequency Seismic Source Characteristics of Cavity Decoupled Underground Nuclear Explosions
The research investigated the high frequency characteristics of the seismic sources corresponding to cavity decoupled nuclear explosions and to assess the implications of these investigations with regard to the detection and discrimination of small decoupled explosions. This study has been carried o...
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creator | Murphy, J R Stevens, J L Rimer, N |
description | The research investigated the high frequency characteristics of the seismic sources corresponding to cavity decoupled nuclear explosions and to assess the implications of these investigations with regard to the detection and discrimination of small decoupled explosions. This study has been carried out using a combination of deterministic simulations and analyses of empirical data recorded from selected cavity decoupled explosions. With regard to the deterministic simulations, a series of nonlinear finite difference calculations have been performed to simulate cavity decoupled explosions in unsaturated tuff and salt emplacement media. These simulations have confirmed the fact that the simple step pressure approximation is not valid at high frequencies and that the initial pressure spike on the cavity wall can induce significant nonlinear response. Preliminary analyses of high frequency seismic data recorded from the STERLING decoupled explosion in salt and the MILL YARD decoupled explosion in unsaturated tuff have provided evidence that the high frequency source components associated with the complex cavity pressure loadings do effectively couple into the seismic regime, in agreement with the predictions of the nonlinear finite difference simulations. |
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This study has been carried out using a combination of deterministic simulations and analyses of empirical data recorded from selected cavity decoupled explosions. With regard to the deterministic simulations, a series of nonlinear finite difference calculations have been performed to simulate cavity decoupled explosions in unsaturated tuff and salt emplacement media. These simulations have confirmed the fact that the simple step pressure approximation is not valid at high frequencies and that the initial pressure spike on the cavity wall can induce significant nonlinear response. Preliminary analyses of high frequency seismic data recorded from the STERLING decoupled explosion in salt and the MILL YARD decoupled explosion in unsaturated tuff have provided evidence that the high frequency source components associated with the complex cavity pressure loadings do effectively couple into the seismic regime, in agreement with the predictions of the nonlinear finite difference simulations.</description><language>eng</language><subject>CAVITIES ; COMPUTATIONS ; DECOUPLING ; DETECTION ; DETERMINANTS(MATHEMATICS) ; EMPLACEMENT ; EXPLOSIONS ; FINITE DIFFERENCE THEORY ; HIGH FREQUENCY ; MEDIA ; NONLINEAR SYSTEMS ; NUCLEAR EXPLOSIONS ; PE62714E ; PRESSURE ; RESPONSE ; SALTS ; SEISMIC DATA ; SEISMIC DETECTION ; Seismic Detection and Detectors ; SEISMIC DISCRIMINATION ; SEISMOLOGY ; SIMULATION ; SOURCES ; SPIKES ; WALLS ; WUAFGL7A10DADB</subject><creationdate>1988</creationdate><rights>Approved for public release; distribution is unlimited.</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,780,885,27567,27568</link.rule.ids><linktorsrc>$$Uhttps://apps.dtic.mil/sti/citations/ADA198121$$EView_record_in_DTIC$$FView_record_in_$$GDTIC$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Murphy, J R</creatorcontrib><creatorcontrib>Stevens, J L</creatorcontrib><creatorcontrib>Rimer, N</creatorcontrib><creatorcontrib>S-CUBED LA JOLLA CA</creatorcontrib><title>High Frequency Seismic Source Characteristics of Cavity Decoupled Underground Nuclear Explosions</title><description>The research investigated the high frequency characteristics of the seismic sources corresponding to cavity decoupled nuclear explosions and to assess the implications of these investigations with regard to the detection and discrimination of small decoupled explosions. This study has been carried out using a combination of deterministic simulations and analyses of empirical data recorded from selected cavity decoupled explosions. With regard to the deterministic simulations, a series of nonlinear finite difference calculations have been performed to simulate cavity decoupled explosions in unsaturated tuff and salt emplacement media. These simulations have confirmed the fact that the simple step pressure approximation is not valid at high frequencies and that the initial pressure spike on the cavity wall can induce significant nonlinear response. Preliminary analyses of high frequency seismic data recorded from the STERLING decoupled explosion in salt and the MILL YARD decoupled explosion in unsaturated tuff have provided evidence that the high frequency source components associated with the complex cavity pressure loadings do effectively couple into the seismic regime, in agreement with the predictions of the nonlinear finite difference simulations.</description><subject>CAVITIES</subject><subject>COMPUTATIONS</subject><subject>DECOUPLING</subject><subject>DETECTION</subject><subject>DETERMINANTS(MATHEMATICS)</subject><subject>EMPLACEMENT</subject><subject>EXPLOSIONS</subject><subject>FINITE DIFFERENCE THEORY</subject><subject>HIGH FREQUENCY</subject><subject>MEDIA</subject><subject>NONLINEAR SYSTEMS</subject><subject>NUCLEAR EXPLOSIONS</subject><subject>PE62714E</subject><subject>PRESSURE</subject><subject>RESPONSE</subject><subject>SALTS</subject><subject>SEISMIC DATA</subject><subject>SEISMIC DETECTION</subject><subject>Seismic Detection and Detectors</subject><subject>SEISMIC DISCRIMINATION</subject><subject>SEISMOLOGY</subject><subject>SIMULATION</subject><subject>SOURCES</subject><subject>SPIKES</subject><subject>WALLS</subject><subject>WUAFGL7A10DADB</subject><fulltext>true</fulltext><rsrctype>report</rsrctype><creationdate>1988</creationdate><recordtype>report</recordtype><sourceid>1RU</sourceid><recordid>eNqFzLEOgjAQgGEWB6O-gcO9gAO66EgKhMkFnbG5HnBJbfHaGnl7Gdyd_uFPvnX2aHgYoRZ6JXI4Q0scnozQ-iRIoEYtGiMJh8gYwPeg9JvjDCWhT5MlA3dnSAbxyRm4JrSkBarPZH1g78I2W_XaBtr9usn2dXVTzcEsYLeojmJXlEV-OefH_PRnfwFjDDqg</recordid><startdate>198805</startdate><enddate>198805</enddate><creator>Murphy, J R</creator><creator>Stevens, J L</creator><creator>Rimer, N</creator><scope>1RU</scope><scope>BHM</scope></search><sort><creationdate>198805</creationdate><title>High Frequency Seismic Source Characteristics of Cavity Decoupled Underground Nuclear Explosions</title><author>Murphy, J R ; Stevens, J L ; Rimer, N</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-dtic_stinet_ADA1981213</frbrgroupid><rsrctype>reports</rsrctype><prefilter>reports</prefilter><language>eng</language><creationdate>1988</creationdate><topic>CAVITIES</topic><topic>COMPUTATIONS</topic><topic>DECOUPLING</topic><topic>DETECTION</topic><topic>DETERMINANTS(MATHEMATICS)</topic><topic>EMPLACEMENT</topic><topic>EXPLOSIONS</topic><topic>FINITE DIFFERENCE THEORY</topic><topic>HIGH FREQUENCY</topic><topic>MEDIA</topic><topic>NONLINEAR SYSTEMS</topic><topic>NUCLEAR EXPLOSIONS</topic><topic>PE62714E</topic><topic>PRESSURE</topic><topic>RESPONSE</topic><topic>SALTS</topic><topic>SEISMIC DATA</topic><topic>SEISMIC DETECTION</topic><topic>Seismic Detection and Detectors</topic><topic>SEISMIC DISCRIMINATION</topic><topic>SEISMOLOGY</topic><topic>SIMULATION</topic><topic>SOURCES</topic><topic>SPIKES</topic><topic>WALLS</topic><topic>WUAFGL7A10DADB</topic><toplevel>online_resources</toplevel><creatorcontrib>Murphy, J R</creatorcontrib><creatorcontrib>Stevens, J L</creatorcontrib><creatorcontrib>Rimer, N</creatorcontrib><creatorcontrib>S-CUBED LA JOLLA CA</creatorcontrib><collection>DTIC Technical Reports</collection><collection>DTIC STINET</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Murphy, J R</au><au>Stevens, J L</au><au>Rimer, N</au><aucorp>S-CUBED LA JOLLA CA</aucorp><format>book</format><genre>unknown</genre><ristype>RPRT</ristype><btitle>High Frequency Seismic Source Characteristics of Cavity Decoupled Underground Nuclear Explosions</btitle><date>1988-05</date><risdate>1988</risdate><abstract>The research investigated the high frequency characteristics of the seismic sources corresponding to cavity decoupled nuclear explosions and to assess the implications of these investigations with regard to the detection and discrimination of small decoupled explosions. This study has been carried out using a combination of deterministic simulations and analyses of empirical data recorded from selected cavity decoupled explosions. With regard to the deterministic simulations, a series of nonlinear finite difference calculations have been performed to simulate cavity decoupled explosions in unsaturated tuff and salt emplacement media. These simulations have confirmed the fact that the simple step pressure approximation is not valid at high frequencies and that the initial pressure spike on the cavity wall can induce significant nonlinear response. Preliminary analyses of high frequency seismic data recorded from the STERLING decoupled explosion in salt and the MILL YARD decoupled explosion in unsaturated tuff have provided evidence that the high frequency source components associated with the complex cavity pressure loadings do effectively couple into the seismic regime, in agreement with the predictions of the nonlinear finite difference simulations.</abstract><oa>free_for_read</oa></addata></record> |
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source | DTIC Technical Reports |
subjects | CAVITIES COMPUTATIONS DECOUPLING DETECTION DETERMINANTS(MATHEMATICS) EMPLACEMENT EXPLOSIONS FINITE DIFFERENCE THEORY HIGH FREQUENCY MEDIA NONLINEAR SYSTEMS NUCLEAR EXPLOSIONS PE62714E PRESSURE RESPONSE SALTS SEISMIC DATA SEISMIC DETECTION Seismic Detection and Detectors SEISMIC DISCRIMINATION SEISMOLOGY SIMULATION SOURCES SPIKES WALLS WUAFGL7A10DADB |
title | High Frequency Seismic Source Characteristics of Cavity Decoupled Underground Nuclear Explosions |
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