东北地区Pn波速度结构研究
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摘要
本文利用2000年1月至2011年2月黑龙江省地震台网的数字地震波形记录中2158条Pn波到时数据,并结合1985～2008年的中国地震年报数据中提取的10641条Pn波到时数据,反演了中国东北地区(东经110°—136°、北纬35°—55°)的Pn波速度结构,结果表明东北地区上地幔顶部速度结构的横向变化与现代构造运动有明显的关联:上地幔顶部Pn波速度低值区与中国东北地区火山活动区域有很好的一致性;松辽盆地地区Pn波速度显然高于其周边区域。东北地区强震大都发生在Pn波的速度低速带或速度过渡带,反映出上地幔顶部的流变性对构造应力的传递起着重要作用。
2158 Pn phase arriving times have been picked from the earthquake waveform recodings of Heilongjiang Digital Seismic Network for 2000—2010,and 10641 Pn phase arriving times have been collected from Annual Bulletin of Chinese Earthquakes for 1985—2008.Pn velocity structure in Northeast China has been inverted.The main results show that the relation between Pn velocity structure and regional tectonic structure is close.The Pn velocities in the areas with the volcano activities are obviously low.The Pn velocity of the songliao basin is higher than of its neighboring areas.Most of strong earthquakes occurre in low Pn velocity areas,which implies that the visco-plasticity of the top-mantle material might play an important role on transferring the tectonic stress to the upper crust.
2158 Pn phase arriving times have been picked from the earthquake waveform recodings of Heilongjiang Digital Seismic Network for 2000—2010,and 10641 Pn phase arriving times have been collected from Annual Bulletin of Chinese Earthquakes for 1985—2008.Pn velocity structure in Northeast China has been inverted.The main results show that the relation between Pn velocity structure and regional tectonic structure is close.The Pn velocities in the areas with the volcano activities are obviously low.The Pn velocity of the songliao basin is higher than of its neighboring areas.Most of strong earthquakes occurre in low Pn velocity areas,which implies that the visco-plasticity of the top-mantle material might play an important role on transferring the tectonic stress to the upper crust.
引文
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[2]马杏垣.中国岩石圈动力学地图集[M].北京:中国地图出版社,1989.
[3]高立新.中国东北地区地震活动的动力背景及其时空特征分析[J].地震,2011,31(1):41～51.
[4]汪素云,许忠淮,裴顺平.中国大陆Pn波速度结构与强震孕育的深部背景[J].地球物理学报,2003,46(6):779～785.
[5]李飞,周仕勇,苏有锦,等.川滇及邻区Pn波速度结构和各向异性研究[J].地球物理学报,2011,54(1):44～54.
[6]洪汉净,吴建平.中国火山危险性等级与活动性分类[J].地震地质,2007,29(3):447～458.
[7]王兆国,刘财,冯嗄,等.中国东北地区地震空问分布与主要断裂带、深部构造及应力场关系[J].世界地质,2009,28(4):513～519.
[8]裴顺平.中国大陆上地幔顶部体波速度层析成像[D].北京:中国地震局地球物理研究所,2002.
[9]裴顺平,许忠淮,汪素云.中国及邻区Pn波速度结构成因探讨[J].地震学报,2004,26(1):1～10.
[10]Hearn T M,Ni J.Pn velocities beneath continental eollisionzones,the Turkish-Iranian Plateau.Geophys.J Int.1994,117:273～283.
[11]杨宝俊.在地学断面域内用地震学方法研究大陆地壳-以中国满洲里-绥芬河地学断面为例[M].北京:地质出版社,1999.
[12]刘嘉麒.中国火山[M].北京:科学出版社,1999.
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