南天山西段中小地震辐射能量的单台测定
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摘要
考虑到新疆地震台网分布不均匀的情况,尝试利用单台的宽频带波形资料进行辐射能量的测定。选用新疆喀什地震台记录的南天山西段中小地震宽频带波形资料,分析地震波形横向分量上的SH波及其后续震相,对每个地震进行辐射花样因子的校正。品质因子Q采用Brune的ω-2衰减模型,用补偿谱的方法试错得到,最后所得结果与新疆地震目录ML震级进行了对比分析,二者具有较好的一致性。
Due to the sparse distribution of seismic stations in Xinjiang,we try to use broadband waveform data of a single station to estimate radiated energy.We choose the broadband waveform data of small-medium earthquakes recorded by Kashi seismic station in western of south Tianshan mountain,analyze the SH wave and latter wave in the seismic map,use the correction of the azimuth-dependence of radiation pattern,Q-value obtained by Brune omega square attenuation source model to obtain the result.compare the result and M_L magnitude,we find they are coherence.
Due to the sparse distribution of seismic stations in Xinjiang,we try to use broadband waveform data of a single station to estimate radiated energy.We choose the broadband waveform data of small-medium earthquakes recorded by Kashi seismic station in western of south Tianshan mountain,analyze the SH wave and latter wave in the seismic map,use the correction of the azimuth-dependence of radiation pattern,Q-value obtained by Brune omega square attenuation source model to obtain the result.compare the result and M_L magnitude,we find they are coherence.
引文
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[2]Choy G L,Boatwright J.Global patterns of radiated seismic energy and apparent stress[J].J.Geophys.Res.,1995,100:18 205-18 228.
[3]Boatwright J,Choy G L,Seekins L C.Regional estimates of radiated seismic energy[J].Bull.Seism.Soc.Amer.,2002,92:1 241-1 255.
[4]Wu Z L.Frequency-size distribution of global seismicity seen from broadband radiated energy[J].Geophys.J.Int.,2000,142:59-66.
[5]吴忠良,陈运泰,Mozaffari P.应力降的标度性质与震源谱高频衰减常数[J].地震学报,1999,21(5):460-468.
[6]Wu Z L.Earthquake scaling paradox[J].Chin.Phys.,2001a,10:395-397.
[7]Kanamori H,Heaton T H.Microscopic and macroscopic physics of earthquakes[C]//Rundle,J.B.,Turcotte,D.L.,Klein,W.(eds.).GeoComplexity and the Physics of Earthquakes.Washington,D.C.:AGU,2000,147-163.
[8]Kanamori H,Anderson D L,Heaton T H.Frictional melting during the rupture of the 1994 Bolivian earthquake[J].Science,1998,279:839-842.
[9]Wu Z L.Scaling of apparent stress from broadband radiated energy catalogue and its focal mechanism dependence[J].Earthplanets Space,2001b,53:943-948.
[10]陈学忠,王小平,王林瑛,等.地震视应力用于震后趋势快速判定的可能性[J].国际地震动态,2003,(7),1-4.
[11]Ide S,Beroza G C.Does apparent stress vary with earthquake size[J].Geophys.Res.Lett.,2001,28:3 349-3 352.
[12]Izutani Y,Kanamori H.Scale-dependence of seismic energy-to-moment ratio for strike-slip earthquakes in Japan[J].Geophys.Res.Lett.,2001,28:4 007-4 010.
[13]中国地震局监测预报司.数字地震观测技术[M].北京:地震出版社,2003.
[14]Boatwright J,Boore D M.Analysis of ground accelerations radiated by the 1980 Livermore Valley earthquakes for directivityand dynamic source characteristics[J].Bull.Seism.Soc.Amer.,1982,70:1 843-1 865.
[15]Boatwright J,Fletcher J B..The partition of radiated energy between P and S wave[J].Bull.Seism.Soc.Amer.,1987,77:361-376.
[16]Brune,J.N..Tectonic stress and spectra of seismic share wave from earthquake[J].J.Geophys.Res.,1970,75:4 997-5 009.
[17]Brune J N.Correction[J].J.Geophys.Res.,1971,76:5 002.
[18]刘瑞丰.数字地震资料在地震矩张量反演和常规地震分析中的应用研究[D].北京:国家地震局地球物理研究所,1996.
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