P/S震相幅值比判据对低震级地震事件的适用性检验
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摘要
基于中国新疆及中亚地区大量天然地震和地下爆炸,检验了较大震级情况下得到的区域P/S震相幅值比识别判据对低震级地震事件的适用性.分析结果表明,对较大震级地震事件具有较好识别效果的P/S震相幅值比判据对低震级事件同样适用,而且对低震级事件也具有与较大震级事件大致相当的识别效果.据WMQ、BLK、MUL和MAK台的25个识别效果较好的P/S震相幅值比判据统计,大于ML3.5和ML3.5以下地震事件的误识率之差约为2个百分点.
Applicability of regional P/S amplitude ratios for the discrimination of low-magnitude seismic events was tested and proved using earthquakes and explosions in Central Asia.Results obtained show that regional P/S amplitude ratios which may discriminate medium or large magnitude events well are also applicable to low magnitude events.Their performances for low magnitude events are almost as good as that for medium or large events.Statistical comparisons based on 25 P/S discriminants from the four seismic stations WMQ,BLK,MUL and MAK showed that the average misclassification rate for low-magnitude seismic events averagely was only 2 percent higher than that for medium and large magnitude seismic events.
Applicability of regional P/S amplitude ratios for the discrimination of low-magnitude seismic events was tested and proved using earthquakes and explosions in Central Asia.Results obtained show that regional P/S amplitude ratios which may discriminate medium or large magnitude events well are also applicable to low magnitude events.Their performances for low magnitude events are almost as good as that for medium or large events.Statistical comparisons based on 25 P/S discriminants from the four seismic stations WMQ,BLK,MUL and MAK showed that the average misclassification rate for low-magnitude seismic events averagely was only 2 percent higher than that for medium and large magnitude seismic events.
引文
靳平,周青云,潘常周.2001.地震事件区域识别判据研究(二):P/S震相幅值比[J].试验与研究,24(1):14-28.
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Fisk M,Bottone S.2000.Regional seismic event characterization using a Bayesian Kriging approach[C/OL]∥The22ndAnnual DoD/DOESeismic Research Symposium:Planning for Verification of and Compliance with the Compre-hensive Nuclear-Test-Ban Treaty(CTBT):01-03[2001-10-01].http:∥www.nemre.nn.doe.gov/review.
Gupta I N,Burnetti J A.1981.Aninvestigation of discriminants for eventsin western USSRbased on regional phases re-corded at station Kabul[J].Bull Seism Soc Amer,71:263-274.
Hartse H E,Taylor S R,Phillips WS,et al.1997.Preliminary study of seismic discriminationin central Asia with em-phasis on western China[J].Bull Seism Soc Amer,87:551-568.
Murphy J R,Bennett TJ.1982.Adiscrimination analysis of short period regional data at Tonto Forest Observatory[J].Bull Seism Soc Amer,72:1351-1366.
Pomeroy P W,Best WJ,McEvilly T C.1982.Test ban treaty verification with regional data:Areview[J].Bull SeismSoc Amer,72:S89-S129.
Ringdal F,Kremenetskaya E.1999.Observed characteristics of regional seismic phases andimplications for P/S discrimi-nationin the Barents/Kara sea region[R]∥Semiannual Tech.Summ.1October1998-31March1999,NORSARSciRep,2-98/99.Kjeller.
Richards P G,Kim W Y.1997.Testing the nuclear test-ban treaty[J].Nature,389:781-782.
Taylor S R.1996.Analysis of high-frequency Pg/Lg ratios from NTS explosions and western U.S.earthquakes[J].BullSeismSoc Amer,86:1042-1043.
Walter WR,Mayeda K M,Patton HJ.1995.Phase and spectral ratio discrimination between NTS earthquakes and ex-plosion.PartⅠ:Empirical observations[J].Bull Seism Soc Amer,85:1050-1067.
Xie J.2001.Excitation of regional waves and magnitude dependence of phase spectral ratios in central Asia[C/OL]∥DOE eds.The23th Annual Seismic Research Symposium:Worldwide Monitoring of Nuclear Explosion:472-480[2002-02-01].http:∥www.nemre.nn.doe.gov/review.
Bennett TJ,Murphy J R.1986.Analysis of seismic discrimination capabilities using regional data from Western UnitedStates event[J].Bull Seism Soc Amer,76:1069-1086.
Fisk M,Bottone S.2000.Regional seismic event characterization using a Bayesian Kriging approach[C/OL]∥The22ndAnnual DoD/DOESeismic Research Symposium:Planning for Verification of and Compliance with the Compre-hensive Nuclear-Test-Ban Treaty(CTBT):01-03[2001-10-01].http:∥www.nemre.nn.doe.gov/review.
Gupta I N,Burnetti J A.1981.Aninvestigation of discriminants for eventsin western USSRbased on regional phases re-corded at station Kabul[J].Bull Seism Soc Amer,71:263-274.
Hartse H E,Taylor S R,Phillips WS,et al.1997.Preliminary study of seismic discriminationin central Asia with em-phasis on western China[J].Bull Seism Soc Amer,87:551-568.
Murphy J R,Bennett TJ.1982.Adiscrimination analysis of short period regional data at Tonto Forest Observatory[J].Bull Seism Soc Amer,72:1351-1366.
Pomeroy P W,Best WJ,McEvilly T C.1982.Test ban treaty verification with regional data:Areview[J].Bull SeismSoc Amer,72:S89-S129.
Ringdal F,Kremenetskaya E.1999.Observed characteristics of regional seismic phases andimplications for P/S discrimi-nationin the Barents/Kara sea region[R]∥Semiannual Tech.Summ.1October1998-31March1999,NORSARSciRep,2-98/99.Kjeller.
Richards P G,Kim W Y.1997.Testing the nuclear test-ban treaty[J].Nature,389:781-782.
Taylor S R.1996.Analysis of high-frequency Pg/Lg ratios from NTS explosions and western U.S.earthquakes[J].BullSeismSoc Amer,86:1042-1043.
Walter WR,Mayeda K M,Patton HJ.1995.Phase and spectral ratio discrimination between NTS earthquakes and ex-plosion.PartⅠ:Empirical observations[J].Bull Seism Soc Amer,85:1050-1067.
Xie J.2001.Excitation of regional waves and magnitude dependence of phase spectral ratios in central Asia[C/OL]∥DOE eds.The23th Annual Seismic Research Symposium:Worldwide Monitoring of Nuclear Explosion:472-480[2002-02-01].http:∥www.nemre.nn.doe.gov/review.
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