新疆伽师及周围构造应力场区域特征探讨
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摘要
在利用伽师及周围58次中强地震震源机制解对这一地区的构造应力场进行分析的基础上,结合系统聚类和应力场反演计算结果,对不同时期、不同区域应力场的变化特征进行了分析。该区域地震以走滑错动为主,柯坪块体逆冲作用更为明显。区域最大主压应力方向近SN,但不同构造背景下的主压应力方向存在着较明显的差异。乌恰-喀什地区P轴基本近SN向,但存在着由NW—SN—NE的随时间变化的过程;柯坪块体内部长期以来受较为一致的NW-SE向压应力作用;伽师震区P轴方向为NE-SW。1996年区域应力场方向开始发生明显的变化,P轴方位向NE偏转,倾角增大。结果表现出不同构造环境下应力场分布格局的特征或变化。
Jiashi and its surrounding areas are composed of many structural zones.Using the focal mechanism solutions of 59 mid-strong earthquakes in Jiashi and its surrounding areas,and combining with the calculation result of system cluster and stress field inversion,we analyzed the evolvement characteristics of the stress field for the different times and the different regions.The result shows as follows:The earthquakes in Jiashi are mainly of strike-slip.However,those of Kalpin block are mainly of reverse events,showing an obvious thrusting.The regional characteristics are different from other areas.The direction of the regional principal stress field is near NS.However,under the different tectonic background,the directions of stress fields are different.The direction of the principal compression stress is near NS in Kashi-Wuqia area.But before and after the 3 earthquakes with M 7,the dynamic evolution from NW to NS and then to NE with time process was observed.Kalpin block has been dominated by the consistent stress field of the NW direction for a long time.However,the direction of the stress field of Jiashi region is NE.From 1996,the direction of the regional stress field has changed obviously.The direction of the P axis was deflected towards NE,and the elevation angle increased.The result shows clearly the regional characteristic and variation of distribution pattern of stress field in different tectonic environments.
Jiashi and its surrounding areas are composed of many structural zones.Using the focal mechanism solutions of 59 mid-strong earthquakes in Jiashi and its surrounding areas,and combining with the calculation result of system cluster and stress field inversion,we analyzed the evolvement characteristics of the stress field for the different times and the different regions.The result shows as follows:The earthquakes in Jiashi are mainly of strike-slip.However,those of Kalpin block are mainly of reverse events,showing an obvious thrusting.The regional characteristics are different from other areas.The direction of the regional principal stress field is near NS.However,under the different tectonic background,the directions of stress fields are different.The direction of the principal compression stress is near NS in Kashi-Wuqia area.But before and after the 3 earthquakes with M 7,the dynamic evolution from NW to NS and then to NE with time process was observed.Kalpin block has been dominated by the consistent stress field of the NW direction for a long time.However,the direction of the stress field of Jiashi region is NE.From 1996,the direction of the regional stress field has changed obviously.The direction of the P axis was deflected towards NE,and the elevation angle increased.The result shows clearly the regional characteristic and variation of distribution pattern of stress field in different tectonic environments.
引文
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王凯英,马瑾,顾国华,等.2003.1996年川滇地区发生的一次应力转向事件[J].地学前缘,10(特刊):233—239.WANG Kai-ying,MA Jin,GU Guo-hua,et al.2003.Rotation of stress axis in Sichuan-Yunan region in1996[J].Earth Science Frontiers,10(Special):233—239(in Chinese).
新疆维吾尔自治区地震局.1997.天山及相邻地区中强震震源机制[J].内陆地震,11(增刊):125—159.Seismological Bureau of Xinjiang Uygur Autonomous Region.1997.Source mechanism solution of medium and strongearthquakes in Tianshan and adjacent area[J].Inland Earthquake,11(Suppl):125—159(in Chinese).
许忠淮,戈澍谟.1984.用滑动方向拟合法反演富蕴地震断裂带应力场[J].地震学报,8(5):395—404.XUZhong-huai,GE Shu-mo.1984.Stress field in the Fuyun,Xinjiang earthquake fracture zone determined by fittingfault slip vector dada[J].Acta Seismologica Sinica,8(5):395—404(in Chinese).
刁桂苓,于利民,李钦祖.1992.震源机制解的系统聚类分析[J].中国地震,8(3):86—92.DIAO Gui-ling,YU Li-min,LI Qin-zu.1992.Hierarchical clustering analysis of the focal mechanism solution[J].Earthquake Research in China,8(3):86—92(in Chinese).
冯先岳.1997.新疆古地震研究[M].乌鲁木齐:新疆卫生出版社.119—129.FEN Xian-yue.1997.The Study of Ancient Earthquakes in Xinjiang[M].Xinjiang Health Press,Urumqi.119—129(inChinese).
冯先岳,栾超群,李军,等.1988.1985年乌恰7.4级地震形变带[J].地震地质,10(2):39—45.FEN Xian-yue,LUAN Chao-qun,LI Jun,et al.1988.The deformation belt of Wuqia earthquake withM7.4in1985[J].Seismology and Geology,10(2):39—45(in Chinese).
高国英,王海涛,温和平,等.2001.帕米尔东北侧中强地震前应力场动态变化特征分析[J].西北地震学报,23(4):389—394.GAO Guo-ying,WANG Hai-tao,WEN He-ping,et al.2001.Analysis on the dynamic change character of the stressfield before mid-strong earthquakes in Northeastern Pamir[J].Northwestern Seismological Journal,23(4):389—394(in Chinese).
高国英,温和平.2000.帕米尔东北侧现代构造应力场与地震活动特征研究[J].中国地震,16(2):176—183.GAO Guo-ying,WEN He-ping.2000.Recent tectonic stress field and seismicity of Northeast Pamir[J].EarthquakeResearch in China,16(2):176—183(in Chinese).
高国英,温和平,聂晓红.2005.1991—2002年新疆中强震震源机制解分析[J].地震,25(1):81—87.GAO Guo-ying,WEN He-ping,NIE Xiao-hong.2005.Analysis on focal mechanism solutions of middle-strong earth-quake in Xijiang from1991to2002[J].Earthquake,25(1):81—87(in Chinese).
李杰,王小强,王琪,等.2004.乌恰伽师地区GPS地壳运动监测网研究[J].内陆地震,18(3):281—288.LI Jie,WANG Xiao-qiang,WANG Qi,et al.2004.Study on GPS monitoring network in the Wuqia and Jiashi area inXinjiang,China[J].Inland Earthquake,18(3):281—288(in Chinese).
刘启元,陈九辉,李顺成,等.2000.新疆伽师强震群区三维地壳上地幔S波速度结构及其地震成因的探讨[J].地球物理学报,43(3):356—366.LIU Qi-yuan,CHEN Jiu-hui,LI Shun-cheng,et al.2000.Passive seismic experiment in Xinjiang Jiashi strong earth-quake region and discussion on its seismic genesis[J].Acta Geophysica Sinica,43(3):356—366(in Chinese).
王凯英,马瑾,顾国华,等.2003.1996年川滇地区发生的一次应力转向事件[J].地学前缘,10(特刊):233—239.WANG Kai-ying,MA Jin,GU Guo-hua,et al.2003.Rotation of stress axis in Sichuan-Yunan region in1996[J].Earth Science Frontiers,10(Special):233—239(in Chinese).
新疆维吾尔自治区地震局.1997.天山及相邻地区中强震震源机制[J].内陆地震,11(增刊):125—159.Seismological Bureau of Xinjiang Uygur Autonomous Region.1997.Source mechanism solution of medium and strongearthquakes in Tianshan and adjacent area[J].Inland Earthquake,11(Suppl):125—159(in Chinese).
许忠淮,戈澍谟.1984.用滑动方向拟合法反演富蕴地震断裂带应力场[J].地震学报,8(5):395—404.XUZhong-huai,GE Shu-mo.1984.Stress field in the Fuyun,Xinjiang earthquake fracture zone determined by fittingfault slip vector dada[J].Acta Seismologica Sinica,8(5):395—404(in Chinese).
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