2010年4月14日青海玉树地震震动图
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摘要
在2010年4月14日07时49分(北京时间)青海省玉树藏族自治州玉树县(33.2°N,96.6°E)7.1级地震发生后,综合考虑震中地区的地质构造背景、活动断裂分布、震源机制结果、震源破裂过程、我国西部的地震动参数经验衰减关系及局部场地效应的影响,用考虑场地效应的震动图快速生成方法,在震后约2小时后得到玉树地震震中地区的震动图,并提供给相关部门使用。结果表明,此次地震的地震烈度特征预测如下:①烈度的展布方向NW-SE向,与玉树断裂的走向一致;②极震区的烈度为Ⅸ度,面积约为300km2;③烈度Ⅸ度区主要位于震中东南方向沿断裂走向近40km和西北方向沿断裂走向15km之间的区域;④Ⅸ度区的西北端由于局部场地条件的影响,其烈度由基岩参考面的Ⅸ度区降为土层上的Ⅷ度区;⑤Ⅷ度区面积约为3000km2;⑥Ⅶ度区的面积约为8000km2;⑦Ⅵ度区面积约为24000km2。
On the basis of the geological structure setting in epicenter area,active faults,focal mechanism,the rupture process,the Western experience attenuation of ground motion parameter relations,and local site effects,ShakeMap of the April 14,2010 Yushu earthquake with magnitude 7.1,Qinghai Province was obtained by prompt generation method of ShakeMap with the site effect.In about 2 hours after the earthquake occurrance,we provide it to the relevant departments.The results of Yushu earthquake ShakeMap show that the seismic intensity characteristics of our prediction are as follows:① intensity distribution is the NW-SE direction,consistent with the strike of Yushu fault;② maximum intensity is Ⅸ with an intensity area about 300km2;③ extent of intensity Ⅸ mainly located between about 40km northwest of epicenter along the fault and 15km southeast of epicenter along the fault;④ because of local site conditions in the northwest of intensity Ⅸarea,the intensity is reduced from Ⅸ on the bedrock to Ⅷ on the soil;⑤ the area of intensity Ⅷ is about 3000km2;⑥ the area of intensity Ⅶ is about 8000km2;⑦ the area of intensity Ⅵ is about 24000km2.
On the basis of the geological structure setting in epicenter area,active faults,focal mechanism,the rupture process,the Western experience attenuation of ground motion parameter relations,and local site effects,ShakeMap of the April 14,2010 Yushu earthquake with magnitude 7.1,Qinghai Province was obtained by prompt generation method of ShakeMap with the site effect.In about 2 hours after the earthquake occurrance,we provide it to the relevant departments.The results of Yushu earthquake ShakeMap show that the seismic intensity characteristics of our prediction are as follows:① intensity distribution is the NW-SE direction,consistent with the strike of Yushu fault;② maximum intensity is Ⅸ with an intensity area about 300km2;③ extent of intensity Ⅸ mainly located between about 40km northwest of epicenter along the fault and 15km southeast of epicenter along the fault;④ because of local site conditions in the northwest of intensity Ⅸarea,the intensity is reduced from Ⅸ on the bedrock to Ⅷ on the soil;⑤ the area of intensity Ⅷ is about 3000km2;⑥ the area of intensity Ⅶ is about 8000km2;⑦ the area of intensity Ⅵ is about 24000km2.
引文
陈鲲、俞言祥、高孟潭,2010,考虑场地效应的ShakeMap系统研究,中国地震,2010,26(1),92～102。
陈培善、白彤霞,1991,震源参数之间的定量关系,地震学报,13(4),401～411。
汪素云、俞言祥、高阿甲等,2000,中国分区地震动衰减关系的确定,中国地震,16(2),99～106。
张勇、刘超、许力生等,2010,http://www.cea-igp.ac.cn/.
Allen T I and Wald D J,2007,Topographic Slope as a Proxy for Seismic Site-Conditions(V3S0)and Amplification around theGlobe:U.S.Geological Survey Open-File Report2007～1357,69p.
Borcherdt R D,1994,Estimates of site-dependent response spectra for design(methodology and justification),EarthquakeSpectra,10,617～654.
Wald D J,Worden B C,Quitoriano V and Pankow K L,2006,ShakeMap Manual:Technical manual,user’s guide,and softwareguide:U.S.Geological Survey,156.
Wald D J and Allen T I,2007,Topographic Slope as a proxy for Seismic Site Conditions and Amplification,Bull Seism Soc Amer,97(5),1379～1395.
陈培善、白彤霞,1991,震源参数之间的定量关系,地震学报,13(4),401～411。
汪素云、俞言祥、高阿甲等,2000,中国分区地震动衰减关系的确定,中国地震,16(2),99～106。
张勇、刘超、许力生等,2010,http://www.cea-igp.ac.cn/.
Allen T I and Wald D J,2007,Topographic Slope as a Proxy for Seismic Site-Conditions(V3S0)and Amplification around theGlobe:U.S.Geological Survey Open-File Report2007～1357,69p.
Borcherdt R D,1994,Estimates of site-dependent response spectra for design(methodology and justification),EarthquakeSpectra,10,617～654.
Wald D J,Worden B C,Quitoriano V and Pankow K L,2006,ShakeMap Manual:Technical manual,user’s guide,and softwareguide:U.S.Geological Survey,156.
Wald D J and Allen T I,2007,Topographic Slope as a proxy for Seismic Site Conditions and Amplification,Bull Seism Soc Amer,97(5),1379～1395.
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