汶川8.0级地震序列及震型判定
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摘要
研究了2008年5月12日四川省汶川8.0级地震余震序列,其特点是:余震序列丰富,持续时间长。余震沿NE向龙门山构造带的中央断裂条形展布,深度横剖面为锲形,呈现地块间强烈汇聚、挤压活动的特点。跨不同断裂段,余震震源机制解有逆冲、斜滑或走滑型,反映的局部构造应力场复杂。汶川8.0级地震序列为主震-余震型,文中给出了其判定的主要依据及分析预测结果。
This article studies the aftershock sequence of the Wenchuan MS8.0 earthquake on May 12,2008,Sichuan province.It is characterized by abundant aftershock sequence and long duration.The aftershocks distribute along the central Longmenshan fault zone extending NE and form a narrow strip and a wedgy distribution in transverse depth profile,which present characteristics of strong convergence and compressive activities between blocks.The focal mechanism of the aftershocks have thrust oblique-slip or strike slip faulting and present complex local tectonic stress field.The Wenchuan MS8.0 earthquake sequence was determined to be mainshock-aftershock type,and the main judgment references and analysis results are also given in this article.
This article studies the aftershock sequence of the Wenchuan MS8.0 earthquake on May 12,2008,Sichuan province.It is characterized by abundant aftershock sequence and long duration.The aftershocks distribute along the central Longmenshan fault zone extending NE and form a narrow strip and a wedgy distribution in transverse depth profile,which present characteristics of strong convergence and compressive activities between blocks.The focal mechanism of the aftershocks have thrust oblique-slip or strike slip faulting and present complex local tectonic stress field.The Wenchuan MS8.0 earthquake sequence was determined to be mainshock-aftershock type,and the main judgment references and analysis results are also given in this article.
引文
[1]王椿镛,Mooney W D,王溪莉,等.川滇地区地壳上地幔三维速度结构研究[J].地震学报,2002,24(1):1-16.
[2]钟继茂,程万正.由多个地震震源机制解求川滇地区平均应力场[J].地震学报,2006,28(4):337-346.
[3]陈学忠,李艳娥,郭祥云.2008年5月12日四川汶川8.0级地震前后震源区应力水平估计[J].国际地震动态,2008(6):1-3.
①朱介寿,汶川地震与龙门山构造带,2008年学术报告。
②周龙泉,基于3D速度结构对汶川序列重新定位,2008年学术报告。
①陈运泰、许力生等,2008年5月12日汶川特大地震震源特性分析报告,2008。
②美国地质调查局(USGS),earthquake.(http://earthquake.usgs.gov/),2008。
③美国哈佛大学,Globalcmt CMT Web Page(http://www.globalcmt.org/CMTsearch.ht ml),2008。
[2]钟继茂,程万正.由多个地震震源机制解求川滇地区平均应力场[J].地震学报,2006,28(4):337-346.
[3]陈学忠,李艳娥,郭祥云.2008年5月12日四川汶川8.0级地震前后震源区应力水平估计[J].国际地震动态,2008(6):1-3.
①朱介寿,汶川地震与龙门山构造带,2008年学术报告。
②周龙泉,基于3D速度结构对汶川序列重新定位,2008年学术报告。
①陈运泰、许力生等,2008年5月12日汶川特大地震震源特性分析报告,2008。
②美国地质调查局(USGS),earthquake.(http://earthquake.usgs.gov/),2008。
③美国哈佛大学,Globalcmt CMT Web Page(http://www.globalcmt.org/CMTsearch.ht ml),2008。
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