玉树M_S7.1地震地表破裂带及其同震位移分布
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摘要
2010年4月14日青海省玉树县发生MS7.1地震,野外地质考察及室内遥感解译表明地震形成反"L"形地表破裂,长约50公里,宏观震中位于郭央烟宋多(33°3′N,96°51′E)。总体上可分为三段,北段与中段间有16km未发现明显地表破裂形迹,中段和南段呈左阶排列,阶区内发育有右阶羽列式破裂。玉树地震最大位移量不小于1.3m,以左行走滑活动为主,兼有挤压逆冲活动。玉树断裂是本次地震的发震断层,断裂南侧羌塘块体和北侧巴颜喀拉块体差异运动导致了玉树地震的发生。地震复发间隔108～185a。破裂南端与1896年强震破裂之间尚有20余公里未发现破裂,其地震危险性还有待进一步研究。
On April 14,2010,a devastating MS7.1 earthquake happened in Yushu County,Qinghai Province.Field geological investigation and remote sensing interpretation show that this earthquake generated an inverse L-type surface rupture of about 50 km,with a maximum displacement of no less than 1.3 m.The surface rupture can be divided into three parts:We found no obvious rupture traces for a long distance of 16km between the northern and middle part;the middle and the southern part showed a left-step arrangement,local features of each part presented a characteristic of right-step pinnate arrangement.The seismogenic Yushu fault is dominated by strike-slip motion,with a small amount of reverse component.Differential movement between the southern Qiangtang block and northern Bayankala block caused this earthquake.Earthquake recurrence period is 185~108 a.Along an approximately 20 km part of Ganzi-Yushu fault,between the southern surface rupture of Yushu MS7.1 earthquake and the 1896 earthquake,no surface rupture has been found,its seismic risk needs further research.
On April 14,2010,a devastating MS7.1 earthquake happened in Yushu County,Qinghai Province.Field geological investigation and remote sensing interpretation show that this earthquake generated an inverse L-type surface rupture of about 50 km,with a maximum displacement of no less than 1.3 m.The surface rupture can be divided into three parts:We found no obvious rupture traces for a long distance of 16km between the northern and middle part;the middle and the southern part showed a left-step arrangement,local features of each part presented a characteristic of right-step pinnate arrangement.The seismogenic Yushu fault is dominated by strike-slip motion,with a small amount of reverse component.Differential movement between the southern Qiangtang block and northern Bayankala block caused this earthquake.Earthquake recurrence period is 185~108 a.Along an approximately 20 km part of Ganzi-Yushu fault,between the southern surface rupture of Yushu MS7.1 earthquake and the 1896 earthquake,no surface rupture has been found,its seismic risk needs further research.
引文
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[2]Tapponnier P,Molnar P.Active faulting and tectonics in China[J].Journal of Geophysical Re-search,1977,82(20):2905-2930.
[3]李闽峰,邢成起,蔡长星,等.玉树断裂活动性研究[J].地震地质,1995,17(3):218-224.
[4]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:地球科学),2003,(S1):199-208.
[5]周荣军,马声浩,蔡长星.甘孜—玉树断裂带的晚第四纪活动特征[J].中国地震,1996,12(3):250-260.
[6]国家地震局震害防御司.中国历史强震目录编[M].北京:地震出版社,1995,277-278.
[7]张军龙,申旭辉,徐岳仁,等.汶川8级大地震的地表破裂特征及分段[J].地震,2009,29(1):149-154.
[8]张军龙.汶川MS8.0地震形成的擦痕形迹及其意义探讨[J].地学前缘,2009,16(3):294-305.
[9]http://www.csi.ac.cn/manage/ht ml/4028861611c5c2ba0111c5c558b00001/-content/10-04/17/1271488288058.ht ml
[10]张培震,王琪,马宗晋.青藏高原现今构造变形特征与GPS速度场[J].地学前缘,2002,9(2):442-450.
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