玉树M_S7.1地震时空破裂过程及与地表破裂带的对应关系
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摘要
根据IRIS全球地震台网15个台的长周期地震仪记录的P波资料,用远场体波地震图反演震源破裂过程的方式,研究了2010年4月14日玉树MS7.1地震震源破裂,并与震后调查地表破裂带做了对比。结果表明:玉树地震在总体上是一次单侧破裂事件,破裂从初始破裂点(即震源位置)开始向东南方向展开,破裂离震源20km处开始贯穿至地表,沿走向方向延伸了约50km,最大滑移量达2m。这些结果与震后考察得到的地表破裂带的特征十分吻合。
Based on the digital teleseismic P-wave seismograms recorded by 15 long-period seismograph stations of the global seismic network,source rupture process of the April 14,2010 Yushu MS=7.1 earthquake is studied by a inversion method,and compared with surface rupture zone which was investigated after the earthquake.The result shows that the earthquake is a unilateral rupture event on the whole.The source rupture initiated at the hypocenter(33.2°N,96.6°E,focal depth 10 km),and propagated to the southeast at first.The rupture broken though the ground surface departed from 20 km of the epicenter,it extended 50 km along strike,the maximal slip is 2 m.These results are coincide with the investigated feature of the surface rupture zone.
Based on the digital teleseismic P-wave seismograms recorded by 15 long-period seismograph stations of the global seismic network,source rupture process of the April 14,2010 Yushu MS=7.1 earthquake is studied by a inversion method,and compared with surface rupture zone which was investigated after the earthquake.The result shows that the earthquake is a unilateral rupture event on the whole.The source rupture initiated at the hypocenter(33.2°N,96.6°E,focal depth 10 km),and propagated to the southeast at first.The rupture broken though the ground surface departed from 20 km of the epicenter,it extended 50 km along strike,the maximal slip is 2 m.These results are coincide with the investigated feature of the surface rupture zone.
引文
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[7]邓启东,张培震,冉永康,等.中国活动构造基本特征.中国科学(D辑),2002,32:1020-1030.
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[2]任俊杰,谢富仁,刘冬英,等.2010年玉树地震的构造环境、历史地震活动及其复发周期估计[J].震灾防御技术,2010,5(2):228-233.
[3]李金臣,潘华,张志中.青海玉树7.1级地震构造背景[J].国际地震动态,2010,377(5):1-5.
[4]周荣军,闻学泽,蔡长星,等.甘孜—玉树断裂带的近代地震与未来地震趋势估计[J].地震地质,1997,19:115-124.
[5]李闽锋,刑成起,蔡长星,等.玉树断裂活动性研究[J].地震地质,1995,17:218-224.
[6]闻学泽,徐锡伟,郑荣章,等.甘孜—玉树断裂的平均滑动速率与近代大地震破裂[J].中国科学(D辑),2003,33(SI):199-208.
[7]邓启东,张培震,冉永康,等.中国活动构造基本特征.中国科学(D辑),2002,32:1020-1030.
[8]刘超,许力生,陈运泰.2010年4月14日青海玉树地震快速矩张量解[J].地震学报,2010,32(3):366-368.
[9]许力生.地震破裂的时空过程研究[D].北京:中国地震局地球物理研究所,1995:122108.
[10]张勇,冯万鹏,许力生,等.2008年汶川大地震的时空破裂过程[J].中国科学(D辑),2008,38(10):1186-1194.
[11]Okada Y.Surface Deformation due to shear and tensile faultsin a half-space[J].Bull.Seism.Soc.Amer.,1985,75(4):1135-1154.
[12]Kennett B L N,Engdahl E R.Travel times for global earthquake location and phase identification[J].Geophys.Jint.,1991,105:42922465.
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