2018年9月4日新疆伽师M_S5.5地震序列及发震构造讨论
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摘要
2018年9月4日新疆伽师发生M_S5.5地震,震中处于塔里木地块西北缘,位于1997～1998年伽师强震群震区内。此次伽师地震前发生了M_S4.7前震,截至9月30日最大余震震级为M_S4.6(M_L5.0),初步判定为前-主-余型地震序列。序列精定位结果显示,余震沿近NE向展布,主震震源深度与1997～1998年伽师强震主震基本一致,发震断层陡立。本文从区域的构造环境、地震震源机制解和余震分布特征等方面分析认为,地震发生在伽师隐伏断裂东南端部,为1997～1998年伽师强震群震区的一次新的构造活动。序列参数、视应力等计算结果显示,伽师M_S5.5地震的预测最大余震震级与最大余震震级M_S4.6接近,表明序列最大余震已经发生。
The Jiashi M_S5.5 earthquake occurred on September 4,2018 in Xinjiang Uygur Autonomous Region,the epicenter is located in the northwestern margin of the Tarim block,in the seismic area of 1997-1998 Jiashi strong earthquake swarm. The Jiashi earthquake has M_S4.7 foreshock,the largest aftershock magnitude M4.6,preliminarily determined as a pre-mainaftershock sequence. The precise positioning results show that the aftershocks are distributed along the NE direction,and the depth of the main shock is basically the same as that of the 1997-1998 Jiashi strong earthquakes. The seismogenic fault rises steeply. In this paper,the seismogenic process of this earthquake is analyzed from the aspects of regional tectonic environment,focal mechanism solution and aftershock distribution. It is considered that the earthquake occurred on the southeastern margin of Jiashi concealed fault,which is a new tectonic activity in the Jiashi strong earthquake swarm area from 1997 to 1998. The calculation results of sequence parameters and apparent stress show that strong earthquakes in the Jiashi earthquake area are unlikely to occur in the near future.
The Jiashi M_S5.5 earthquake occurred on September 4,2018 in Xinjiang Uygur Autonomous Region,the epicenter is located in the northwestern margin of the Tarim block,in the seismic area of 1997-1998 Jiashi strong earthquake swarm. The Jiashi earthquake has M_S4.7 foreshock,the largest aftershock magnitude M4.6,preliminarily determined as a pre-mainaftershock sequence. The precise positioning results show that the aftershocks are distributed along the NE direction,and the depth of the main shock is basically the same as that of the 1997-1998 Jiashi strong earthquakes. The seismogenic fault rises steeply. In this paper,the seismogenic process of this earthquake is analyzed from the aspects of regional tectonic environment,focal mechanism solution and aftershock distribution. It is considered that the earthquake occurred on the southeastern margin of Jiashi concealed fault,which is a new tectonic activity in the Jiashi strong earthquake swarm area from 1997 to 1998. The calculation results of sequence parameters and apparent stress show that strong earthquakes in the Jiashi earthquake area are unlikely to occur in the near future.
引文
陈棋福,2003,中国震例(1997~1999),北京:地震出版社.
陈学忠、李艳娥、郭祥云,2008,2008 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,国际地震动态,(6),1~3.
房立华、吴建平、王未来等,2015,2014 年新疆于田 MS7.3 地震序列重定位,地 球物理学报,58 ( 3),802 ~ 808,doi: 10.6038 / cjg20150310.
韩立波、蒋长胜、包丰,2012,2010 年河南太康 MS4.6 地震序列震源参数的精确确定,地球物理学报,55(9),2973 ~ 2981.
黄媛、吴建平、张天中等,2008,汶川 8.0 级大地震及其余震序列重定位研究,中国科学:D 辑,38(10),1242~1249.
蒋海昆、李永莉、曲延军等,2006,中国大陆中强地震序列类型的空间分布特征,地震学报,28(4),389~398.
刘建明、王琼、刘杰等,2016,新源、和静交界 ML6.8 地震序列的应力降和震源机制研究,中国地震,32(1),28 ~ 39.
刘正荣、钱兆霞、王维清,1979,前震的一个标志——地震频度的衰减,地震研究,2(4),1~9.
龙锋、张永久、闻学泽等,2010,2008年8月30日攀枝花-会理6.1级地震序列ML≥4.0事件的震源机制解,地球物理学报,53(12),2852~2860.
罗艳、赵里、曾祥方等,2015,芦山地震序列震源机制及其构造应力场空间变化,中国科学:地球科学,45(4),538~550.
吕坚、郑勇、倪四道等,2008,2005年11月26日九江-瑞昌MS5.7、MS4.8地震的震源机制解与发震构造研究,地球物理学报,51(1),158~164.
彭树森,1993,大地形变测量所反映的天山最新构造运动,内陆地震,7(2),136~141.
秦嘉政、邬成栋、钱晓东,2004,2001年永胜6.0级地震的余震序列应力降研究,地震研究,27(2),146~152.
曲均浩、蒋海昆、李金等,2015,2013~2014年山东乳山地震序列发震构造初探,地球物理学报,58(6),1954~1962,doi:10.6038/cjg20150611.
邵学钟、张家茹、范会吉,2013,地震转换波测深,北京:地震出版社.
杨志高、张晓东,2009,首都圈地区地震视应力的计算及空间分布,地震,29(4),32~43.
易桂喜、龙锋、Vallage A等,2016,2013年芦山地震序列震源机制与震源区构造变形特征分析,地球物理学报,59(10),3711~3731.doi:10.6038/cjg20161017.
易桂喜、龙锋、张致伟,2012,汶川MS8.0地震余震震源机制时空分布特征,地球物理学报,55(4),1213~1227,doi:10.6038/j.issn.0001-5733.2012.04.017.
郑勇、马宏生、吕坚等,2009,汶川地震强余震(MS≥5.6)的震源机制解及其与发震构造的关系,中国科学:地球科学,39(4),413~426.
钟羽云、张帆、张震峰等,2004,应用强震应力降和视应力进行震后趋势快速判定的可能性,防震减灾工程学报,24(1),8~14.
周少辉、蒋海昆,2017,景谷6.6级、鲁甸6.5级地震序列应力降变化对比研究,中国地震,33(1),23~37.
Choy G I,Boatwright J L,1995,Global patterns of radiated seismic energy and apparent stress,J Geophys Res,100(B9),18205~18288.
Tan Y,Zhu L P,Helmberger D V,et al,2006,Locating and modeling regional earthquakes with two stations,J Geophys Res,111(B1),B01306,doi:10.1029/2005JB003775.
Waldhauser F,Ellsworth W L,2000,A double-difference earthquake location algorithm:method and application to the northern Hayward Fault,California,Bull Seismol Soc Am,90(6),1353~1368.
Zhao L S,Helmberger D V,1994,Source estimation from broadband regional seismograms,Bull Seismol Soc Am,84(1),91~104.
Zhu L P,Helmberger D V,1996,Advancement in source estimation techniques using broadband regional seismograms,Bull Seismol Soc Am,86(5),1634~1641.
陈学忠、李艳娥、郭祥云,2008,2008 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,国际地震动态,(6),1~3.
房立华、吴建平、王未来等,2015,2014 年新疆于田 MS7.3 地震序列重定位,地 球物理学报,58 ( 3),802 ~ 808,doi: 10.6038 / cjg20150310.
韩立波、蒋长胜、包丰,2012,2010 年河南太康 MS4.6 地震序列震源参数的精确确定,地球物理学报,55(9),2973 ~ 2981.
黄媛、吴建平、张天中等,2008,汶川 8.0 级大地震及其余震序列重定位研究,中国科学:D 辑,38(10),1242~1249.
蒋海昆、李永莉、曲延军等,2006,中国大陆中强地震序列类型的空间分布特征,地震学报,28(4),389~398.
刘建明、王琼、刘杰等,2016,新源、和静交界 ML6.8 地震序列的应力降和震源机制研究,中国地震,32(1),28 ~ 39.
刘正荣、钱兆霞、王维清,1979,前震的一个标志——地震频度的衰减,地震研究,2(4),1~9.
龙锋、张永久、闻学泽等,2010,2008年8月30日攀枝花-会理6.1级地震序列ML≥4.0事件的震源机制解,地球物理学报,53(12),2852~2860.
罗艳、赵里、曾祥方等,2015,芦山地震序列震源机制及其构造应力场空间变化,中国科学:地球科学,45(4),538~550.
吕坚、郑勇、倪四道等,2008,2005年11月26日九江-瑞昌MS5.7、MS4.8地震的震源机制解与发震构造研究,地球物理学报,51(1),158~164.
彭树森,1993,大地形变测量所反映的天山最新构造运动,内陆地震,7(2),136~141.
秦嘉政、邬成栋、钱晓东,2004,2001年永胜6.0级地震的余震序列应力降研究,地震研究,27(2),146~152.
曲均浩、蒋海昆、李金等,2015,2013~2014年山东乳山地震序列发震构造初探,地球物理学报,58(6),1954~1962,doi:10.6038/cjg20150611.
邵学钟、张家茹、范会吉,2013,地震转换波测深,北京:地震出版社.
杨志高、张晓东,2009,首都圈地区地震视应力的计算及空间分布,地震,29(4),32~43.
易桂喜、龙锋、Vallage A等,2016,2013年芦山地震序列震源机制与震源区构造变形特征分析,地球物理学报,59(10),3711~3731.doi:10.6038/cjg20161017.
易桂喜、龙锋、张致伟,2012,汶川MS8.0地震余震震源机制时空分布特征,地球物理学报,55(4),1213~1227,doi:10.6038/j.issn.0001-5733.2012.04.017.
郑勇、马宏生、吕坚等,2009,汶川地震强余震(MS≥5.6)的震源机制解及其与发震构造的关系,中国科学:地球科学,39(4),413~426.
钟羽云、张帆、张震峰等,2004,应用强震应力降和视应力进行震后趋势快速判定的可能性,防震减灾工程学报,24(1),8~14.
周少辉、蒋海昆,2017,景谷6.6级、鲁甸6.5级地震序列应力降变化对比研究,中国地震,33(1),23~37.
Choy G I,Boatwright J L,1995,Global patterns of radiated seismic energy and apparent stress,J Geophys Res,100(B9),18205~18288.
Tan Y,Zhu L P,Helmberger D V,et al,2006,Locating and modeling regional earthquakes with two stations,J Geophys Res,111(B1),B01306,doi:10.1029/2005JB003775.
Waldhauser F,Ellsworth W L,2000,A double-difference earthquake location algorithm:method and application to the northern Hayward Fault,California,Bull Seismol Soc Am,90(6),1353~1368.
Zhao L S,Helmberger D V,1994,Source estimation from broadband regional seismograms,Bull Seismol Soc Am,84(1),91~104.
Zhu L P,Helmberger D V,1996,Advancement in source estimation techniques using broadband regional seismograms,Bull Seismol Soc Am,86(5),1634~1641.
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