印度洋T波与地震震源参数的相关性
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摘要
从2004-12-26苏门答腊(Mw=9.3)大地震发生后,在该区域诱发的137个地震的波形记录中提取出了清晰的T波,并分析研究了T波波形特征与地震震源参数的相关性.通过分析计算得到如下结论:(Ⅰ)对于同一震级的地震,走滑型地震在海水声纳层中激发的T波能量大于正逆断层型地震;(Ⅱ)随着深度的增加,激发的T波与P波能量的比值(T/P)在逐渐减小;(Ⅲ)T与P,S波峰值到时差与地震震中距呈现较好的线性关系;(Ⅳ)在纬度1.0至2.5的区域,存在一个地震波向声波转换效率高的区域.
A total number of 137 earthquakes that occurred after the Big Sumatra earthquake(2004-12-26,Mw=9.3)in the area of Sumatra were used to investigate the relationship between T-wave acoustic energy and the earthquake fault parameters.Computation and investigation results show that:(Ⅰ)for those earthquakes of a common given magnitude,T-wave energy produced by normal and reverse fault is lower than that of strike-slip events;(Ⅱ)T-wave energy decreases with the increase in earthquake depth;(Ⅲ)there is a good linear relationship between the travel time difference and the epicentral distance;(Ⅳ)a high efficient T-wave conversion area exists in the latitude range from 1.0 degree to 2.5 degree.
A total number of 137 earthquakes that occurred after the Big Sumatra earthquake(2004-12-26,Mw=9.3)in the area of Sumatra were used to investigate the relationship between T-wave acoustic energy and the earthquake fault parameters.Computation and investigation results show that:(Ⅰ)for those earthquakes of a common given magnitude,T-wave energy produced by normal and reverse fault is lower than that of strike-slip events;(Ⅱ)T-wave energy decreases with the increase in earthquake depth;(Ⅲ)there is a good linear relationship between the travel time difference and the epicentral distance;(Ⅳ)a high efficient T-wave conversion area exists in the latitude range from 1.0 degree to 2.5 degree.
引文
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[15]Okal E A,Alasset P J,Hyremand O,et al.The deficient T waves of tsunami earthquakes[J].Geophys J Int,2003,152:416-432.
[16]Frank M G,Piserchia P F.Zones of T-wave excitation in the NE Indian ocean mapper using variations in backazi muth over ti me obtained from multi-channel correlation of I MS hydrophone triplet data[J].Geophys J Int,2004,158:239-256.
[17]Po Chen,Thomas HJ,Li Zhao.Finite-moment tensor of the3September2002Yorba Linda earthquake[J].Bull Seism Soc Am,2005,95(3):1170-1180.
[2]Johnson R H.Esti mating rupture length from T-waves,in Tsunamis in the Pacific Ocean[C]//Proceeding of the International Symposium on Tsunamis and Tsunami Research.Honolulu:East-west Center Press,1970,86:253-259.
[3]Catherine D G H,John A O.Excitation of T-phases by seafloor scattering[J].J Acoust Soc,2001,109:1944-1954.
[4]Frank M G,Pierre F P.Zone of T-wave excitation in the NE Indian Ocean mapped using variations in backazi muth over ti me obtained from multi-channel correlation of I MS hydrophone triplot data[J].Geophys J Int,2004,158:239-256.
[5]Minkyu P,Robert I O.Modal scattering:a key to understanding oceanic T-waves[J].Geophys Res Lett,2001,28:3401-3404.
[6]Robert P D.Empirical relationship of T-wave energy and fault parameters of northeast Pacific Ocean earthquakes[J].Geophys Res Lett,2001,28:2537-2540.
[7]Reymond D,Hyvernaud O,Talandier J,et al.T-wave detection of Two underwater explosions off Hawaii on13April2000[J].Bull Seism Soc Am,2003,93(2):804-816.
[8]Harris D B,D Spain G,Goldner A.Regional observation of a nuclear test froma vertical hydrophone array[J].Bull Seism Soc Am,1994,84(4):1148-1153.
[9]Yoshihisa H,Daniel A W,Charles S M.T-phase data and regional tsunamigenesis in Japan[J].Bull Seism Soc Am,1992,82(5):2213-2223.
[10]Okal E A,Talandier J.T waves fromthe great1994Bolivian deep earthquake in relation to channeling of S wave energy up the slab[J].J Geophys Res,1997,102:27421-27437.
[11]Yang Ying-jie,Donald WF.I mproving epicentral and magnitude esti mation of earthquakes from T phases by considering the excitation function[J].Bull Seism Soc Am,2003,93(5):2106-2122.
[12]Talandier J,Okal E A.On the mechanism of conversion of seismic waves to and from T waves inthe vicinity of island shores[J].Bull Seism Soc Am,1998,88(2):621-632.
[13]Okal E A.“Detached”deep earthquakes:Are they really[J].Phys Earth Planet Int,2001,127:109-143.
[14]Robert A S,John A H.Hydroacoustic earthquake detection in the arctic basin with the spinnaker array[J].Bull Seism Soc Am,2001,91(3):572-579.
[15]Okal E A,Alasset P J,Hyremand O,et al.The deficient T waves of tsunami earthquakes[J].Geophys J Int,2003,152:416-432.
[16]Frank M G,Piserchia P F.Zones of T-wave excitation in the NE Indian ocean mapper using variations in backazi muth over ti me obtained from multi-channel correlation of I MS hydrophone triplet data[J].Geophys J Int,2004,158:239-256.
[17]Po Chen,Thomas HJ,Li Zhao.Finite-moment tensor of the3September2002Yorba Linda earthquake[J].Bull Seism Soc Am,2005,95(3):1170-1180.
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