中国西部地震视应力的空间分布
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摘要
利用 1 987年 1月～ 1 998年 1 2月的 NEIC宽频带地震辐射能量目录和哈佛 CMT目录 ,给出了中国大陆地震的视应力分布 .由于资料所限 ,主要结果是针对西部的结果 .所得结果表明 ,中国大陆地震的视应力平均为 0 .8MPa.青藏高原东缘的视应力最高为 2 .6 MPa,平均水平高于其邻近地区一倍以上 .视应力分布与 2 0世纪的累积地震能量分布具有一定的相关性
Distribution of apparent stress in Chinese mainland and its surrounding regions was presented using the NEIC broadband radiated energy catalogue and the Harvard CMT catalogue from January 1987 to December 1998. Due to the limitation on the number of samples, reliable results are only for the western China. It is observed that the average apparent stress in Chinese mainland is 0.8 MPa; The maximum apparent stress to the east of the Tibetan plateau is 2.6 MPa; And the average apparent stress in the north-south seismic belt is more than one time higher than its adjacent regions. Distribution pattern of apparent stress seems to have a large-scale correlation with the cumulative energy release level in the 20th century.
Distribution of apparent stress in Chinese mainland and its surrounding regions was presented using the NEIC broadband radiated energy catalogue and the Harvard CMT catalogue from January 1987 to December 1998. Due to the limitation on the number of samples, reliable results are only for the western China. It is observed that the average apparent stress in Chinese mainland is 0.8 MPa; The maximum apparent stress to the east of the Tibetan plateau is 2.6 MPa; And the average apparent stress in the north-south seismic belt is more than one time higher than its adjacent regions. Distribution pattern of apparent stress seems to have a large-scale correlation with the cumulative energy release level in the 20th century.
引文
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SornetteD,KnopoffL,KaganY Y,etal.1996.Rank-ordering statistics of extreme events:Application to the distributionof large earthquakes[J].J GeophysRes,101:13883～13893
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WuZhongliang.2000.Frequency-size distribution of global seismicity seen from broadband radiated energy[J].GeophysJInt,142:59～66
WuZhongliang.2001 a.Earthquake scaling paradox[J].ChinPhys,10:395～397
WuZhongliang.2001 b.Scaling of apparent stress from broadband radiated energy catalogue and seismic moment catalogueand its focal mechanism dependence[J].EarthPlanetsSpace,53:943～948
WyssM,BruneJN.1968.Seismic moment,stress,and source dimensions forearthquakes in theCalifornia-Nevada region[J].J GeophysRes,73:4681～4694
XuZ H,WangS Y,HuangY R,etal.1992.Tectonic stress field ofChina inferred from a large number of small earth-quakes[J].J GeophysRes,97:11867～11877
李鸿吉,秦建业.1994.缅甸及其周围地区的震源机制和现代应力场[J].地震学报,16(4):463～471
徐纪人,尾池和夫.1995.青藏高原东缘南段应力场特征及其与板块运动的关系[J].地震学报,17(1):31～40
AkiK,RichardsP G.1980.QuantitativeSeismology.Theory andMethods[M].SanFrancisco:Freeman,810～811
BoatwrightJ,ChoyG L.1986.Teleseismic estimatesof theenergy radiated by shallow earthquakes[J].J GeophysRes,91:2095～2112
ChoyG L,BoatwrightJL.1995.Global patternsof radiated seismic energy and apparent stress[J].J GeophysRes,100:18205～18228
DziewonskiA M,ChouT-A,WoodhouseJH.1981.Determination of earthquakesource parametersfrom waveform data forstudies of global and regional seismicity[J].J GeophysRes,86:2825～2852
FrohlichC.2000.Display and quantitative assessment of distributions of earthquake focal mechanisms[J].GeophysJ Int,144:300～308
FrohlichC,CoffinM F,MassellC,etal.1997.Constraints onMacquarieRidge tectonicsprovided byHarvard focalmecha-nisms and teleseismic earthquake locations[J].J GeophysRes,102:5029～5041
FrohlichC,DavisS D.1993.Teleseismic b values;or,much ado about1.0[J].J GeophysRes,98:631～644
KaganY Y.1997.Seismic moment-frequency relation for shallow earthquakes:Regional comparison[J].J GeophysRes,102:2835～2852
KaganY Y.2000.Temporal correlations of earthquake focal mechanisms[J].GeophysJ Int,143:881～897
KaganY Y,JacksonD D.1994.Long-term probabilisticforecasting of earthquakes[J].J GeophysRes,99:13685～13700
KaganY Y,JacksonD D.1995.New seismic gap hypothesis:Five years after[J].J GeophysRes,100:3943～3959
KaganY Y,JacksonD D.1999.Worldwide doublets of large shallow earthquakes[J].BullSeismSocAmer,89:1147～1155
KanamoriH,AndersonD L,HeatonT H.1998.Frictional melting during the rupture of the1994Bolivian earthquake[J].Science,279:839～842
KanamoriH,HeatonT H.2000.Microscopic and macroscopic physics of earthquakes[A].In:RundleJB,TurcotteD L,KleinW eds.GeoComplexity and thePhysicsofEarthquakes[C].WashingtonD C:AGU,147～163
KawakatsuH.1991.Enigma of earthquakes at ridge-transform-fault plate boundaries-distribution of non-double couple pa-rameter ofHarvardCMT solutions[J].GeophysResLett,18:1103～1106
McCaffreyR.1997.Influencesof recurrence timesand faultzone temperatureson the age-rate dependence of subduction zoneseismicity[J].J GeophysRes,102:22839～22854
McGarrA.1999.On relating apparentstress to thestresscausing earthquake faultslip[J].J GeophysRes,104:3003～3011
MontoneP,AmatoA,PondrelliS.1999.Active stress map ofItaly[J].J GeophysRes,104:25595～25610
NewmanA V,OkalE A.1998.Teleseismicestimatesof radiated seismicenergy:TheE/M0 discriminantforTsunamiearth-quakes[J].J GeophysRes,103:26885～26898
PattonH J.1998.Bias in thecentroid momenttensor forcentralAsian earthquakes:Evidence from regionalsurface waveda-ta[J].J GeophysRes,103:26963～26974
PulidoN,IrikuraK.2000.Estimation of dynamic rupture parameteres from the radiated seismic energy and apparentstress[J].GeophysResLett,27:3945～3948
ReasenbergP A.1999.Foreshock occurrence before large earthquakes[J].J GeophysRes,104:4755～4768
SornetteD,KnopoffL,KaganY Y,etal.1996.Rank-ordering statistics of extreme events:Application to the distributionof large earthquakes[J].J GeophysRes,101:13883～13893
TanimotoT,OkamotoT.2000.Change of crustal potential energy by earthquakes:An indicator for extensional and com-pressional tectonics[J].GeophysResLett,27:2313～2316
WuZhongliang.2000.Frequency-size distribution of global seismicity seen from broadband radiated energy[J].GeophysJInt,142:59～66
WuZhongliang.2001 a.Earthquake scaling paradox[J].ChinPhys,10:395～397
WuZhongliang.2001 b.Scaling of apparent stress from broadband radiated energy catalogue and seismic moment catalogueand its focal mechanism dependence[J].EarthPlanetsSpace,53:943～948
WyssM,BruneJN.1968.Seismic moment,stress,and source dimensions forearthquakes in theCalifornia-Nevada region[J].J GeophysRes,73:4681～4694
XuZ H,WangS Y,HuangY R,etal.1992.Tectonic stress field ofChina inferred from a large number of small earth-quakes[J].J GeophysRes,97:11867～11877
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