伽师强震群活动过程的应力触发作用研究
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摘要
2003年2月24日位于1997~1998年伽师震区东南约20km的新疆巴楚-伽师地区发生了MS6·8地震,其余震丰富、强度大。1997~1998年伽师强震群的发生是否会对2003年巴楚-伽师MS6·8地震产生触发作用?1996年阿图什发生MS6·7地震,时隔10个月距其70km处又发生了伽师强震群,1996年阿图什地震的发生是否有利于1997~1998年伽师强震群的发生?1997~1998年伽师震区接连发生9次6级以上地震,伽师强震群中各强震之间会产生怎样的影响?针对上述问题,本文结合伽师周围地区地震活动特征分析研究了自1996年阿图什MS6·7地震及1997~1998年伽师强震群至2003年巴楚-伽师MS6·8地震在整个伽师强震群活动过程中的应力触发作用。研究结果表明:1996年阿图什MS6·7地震在一定程度上有利于1997~1998年伽师强震群的发生;伽师强震群中先发生的6级地震产生的累加静态库仑破裂应力变化对后续6级地震有一定触发作用;1997~1998年伽师强震群折合为1次地震产生的静态库仑破裂应力变化表明,其对2003年巴楚-伽师MS6·8地震触发作用明显。
The Bachu-Jiashi earthquake of M_S6.8 occurred on Feb.24, 2003, in Xinjiang, which is 20km from the southeast Jiashi seismic region in 1997～1998, and its aftershocks are rich and strong. The 1997～1998 Jiashi strong earthquake swarm will trigger Bachu-Jiashi earthquake of M_S6.8? The Atushi earthquake of M_S6.8 occurred in 1996, and the 1997～1998 Jiashi strong earthquake swarm occurred 10 months later about 70km from Atushi earthquake. The Atushi earthquake of M_S6.7 is encouraging the 1997～1998 Jiashi strong earthquake swarm? The 9 earthquakes with M_S6.0 successively from 1996 to 1997 in the Jiashi seismic region, how do they act on each other? To answer the question above, the article studies the triggering of activity process of the whole Jiashi earthquake swarm from the 1996 Atushi earthquake of M_S6.7,1997～1998 Jiashi strong swarm and the 2003 Bachu-Jiashi earthquake of M_S6.8, with analyzing seismicity characteristics around the Jiashi region. The result shows that the 1996 Atushi earhquake of M_S6.7 encouraged the 1997～1998 Jiashi strong swarm to some extent, and the cumulative Coulomb stress change from the previous M6.0 earthquakes of the Jiashi strong swarm triggered the following M6.0 events to some extent, and the Coulomb stress change from the converted Jiashi strong swarm encouraged remarkable 2003 Bachu-Jiashi earthquake of M_S6.8.
The Bachu-Jiashi earthquake of M_S6.8 occurred on Feb.24, 2003, in Xinjiang, which is 20km from the southeast Jiashi seismic region in 1997～1998, and its aftershocks are rich and strong. The 1997～1998 Jiashi strong earthquake swarm will trigger Bachu-Jiashi earthquake of M_S6.8? The Atushi earthquake of M_S6.8 occurred in 1996, and the 1997～1998 Jiashi strong earthquake swarm occurred 10 months later about 70km from Atushi earthquake. The Atushi earthquake of M_S6.7 is encouraging the 1997～1998 Jiashi strong earthquake swarm? The 9 earthquakes with M_S6.0 successively from 1996 to 1997 in the Jiashi seismic region, how do they act on each other? To answer the question above, the article studies the triggering of activity process of the whole Jiashi earthquake swarm from the 1996 Atushi earthquake of M_S6.7,1997～1998 Jiashi strong swarm and the 2003 Bachu-Jiashi earthquake of M_S6.8, with analyzing seismicity characteristics around the Jiashi region. The result shows that the 1996 Atushi earhquake of M_S6.7 encouraged the 1997～1998 Jiashi strong swarm to some extent, and the cumulative Coulomb stress change from the previous M6.0 earthquakes of the Jiashi strong swarm triggered the following M6.0 events to some extent, and the Coulomb stress change from the converted Jiashi strong swarm encouraged remarkable 2003 Bachu-Jiashi earthquake of M_S6.8.
引文
①赵翠萍等,2006,《新疆巴楚-伽师6.8级地震及未来强震趋势研究》报告,第5章。
傅征祥、刘桂萍,1999,海原大地震可能触发古浪大地震的力学机制,《中国地震学会成立20周年纪念文集》(陈运泰主编),北京:地震出版社:234~243。
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,中国地震,16(2):176~184。
顾瑾萍、王海涛、赵翠萍等,2003,新疆阿图什7级地震和伽师震群介质参数讨论,地震,23(1):63~69。
郝平、田勤俭、傅征祥等,2004,2000年1月15日姚安6.5级地震较强余震的应力触发,地震研究,27(3):246~251。
万永革、吴忠良、周公威等,2002,地震应力触发研究,地震学报,24(5):533~551。
单新建、何玉梅、朱燕等,2002,新疆伽师强震群的震源破裂特征,地震地质,24(1):59~68。
赵金仁、张先康、张成科等,2002,伽师—阿图什震区地壳深部结构特征的探测与研究,中国地震,18(4):317~325。
周仕勇、许忠淮、陈晓非,2001,伽师强震群震源特征及震源机制力学成因分析,地球物理学报,44(5):654~662。
DengJ,Sykes L R.1997a.Stress evolution in southern in southern California and triggering of moderate-size earthquakes:A200-yearperspective.J Geophys Res,102:9859~9886.
DengJ,Sykes L R.1997b.Evolution of the stress field in southern California and triggering of moderate-,small-,and micro-sizeearthquakes.J Geophys Res,102:24411~24435.
Harris,R.A.,and R.W.Simpson.1992.Changes in static stress on southern California faults after the1992Landers earthquakes,Nature,360,251~254.
King,G.C.P.,R.S.Stein,and J.Lin.1994.Static stress changes andthe triggering of earthquakes.Bull.Seismol.Soc.Am.,84,935~953.
Okada Y.1992.Internal deformation due to shear andtensile faults in a half-space.Bull SeismSoc Amer,82:1018~1040.
Reasenberg,P.A.,and R.W.Simpson.1992.Response of regional seismicitytothe static stress change produced by the Loma Prietaearthquake,Science,255,1687~1690.
Stein RS,Barka AA,Dieterich J H.1997.Progressive failure on the North Anatolian fault since1939by earthquake stress triggering.Geophys J Int,128:594~604.
傅征祥、刘桂萍,1999,海原大地震可能触发古浪大地震的力学机制,《中国地震学会成立20周年纪念文集》(陈运泰主编),北京:地震出版社:234~243。
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,中国地震,16(2):176~184。
顾瑾萍、王海涛、赵翠萍等,2003,新疆阿图什7级地震和伽师震群介质参数讨论,地震,23(1):63~69。
郝平、田勤俭、傅征祥等,2004,2000年1月15日姚安6.5级地震较强余震的应力触发,地震研究,27(3):246~251。
万永革、吴忠良、周公威等,2002,地震应力触发研究,地震学报,24(5):533~551。
单新建、何玉梅、朱燕等,2002,新疆伽师强震群的震源破裂特征,地震地质,24(1):59~68。
赵金仁、张先康、张成科等,2002,伽师—阿图什震区地壳深部结构特征的探测与研究,中国地震,18(4):317~325。
周仕勇、许忠淮、陈晓非,2001,伽师强震群震源特征及震源机制力学成因分析,地球物理学报,44(5):654~662。
DengJ,Sykes L R.1997a.Stress evolution in southern in southern California and triggering of moderate-size earthquakes:A200-yearperspective.J Geophys Res,102:9859~9886.
DengJ,Sykes L R.1997b.Evolution of the stress field in southern California and triggering of moderate-,small-,and micro-sizeearthquakes.J Geophys Res,102:24411~24435.
Harris,R.A.,and R.W.Simpson.1992.Changes in static stress on southern California faults after the1992Landers earthquakes,Nature,360,251~254.
King,G.C.P.,R.S.Stein,and J.Lin.1994.Static stress changes andthe triggering of earthquakes.Bull.Seismol.Soc.Am.,84,935~953.
Okada Y.1992.Internal deformation due to shear andtensile faults in a half-space.Bull SeismSoc Amer,82:1018~1040.
Reasenberg,P.A.,and R.W.Simpson.1992.Response of regional seismicitytothe static stress change produced by the Loma Prietaearthquake,Science,255,1687~1690.
Stein RS,Barka AA,Dieterich J H.1997.Progressive failure on the North Anatolian fault since1939by earthquake stress triggering.Geophys J Int,128:594~604.
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