2005年新疆克孜尔震群的重新定位
|
摘要
用双差地震定位法对2005年9月23日克孜尔震群进行重新定位。从平面上,重新定位地震集中分布在一个长约14.5 km,宽约9.0 km的长方形内,其长轴为N30°W向,与克孜尔断裂近乎垂直。从震源深度来看,重新定位地震的震源深度全部分布在21 km以内,集中分布在10~19 km,平均深度为13.6 km;震群中绝大部分小震发生在沉积层内,而震级较大地震基本发生在结晶地壳的上地壳内。其剖面图显示,这次震群是从结晶地壳开始沿着N30°W方向向上破裂至沉积层。根据震区附近断裂性质和该区历史小震震中分布分析认为,克孜尔水库库区附近可能存在两条共轭断裂,右翼断裂可能是这次震群的发震构造。
The Kezir earthquake swarm occurred on Sep.23,2005 was relocated with the double different earthquake location algorithm.The result shows that distribution of the earthquake and aftershocks is in a rectangle with long margin of 14.5 km and width margin of 9.0 km,and the direction of long axis is N30°W,it nearly parallel to the Kezir fault.The depth is distributed within 21 km,and the most are concentrated between 10~19 km,the average depth is 13.6 km;most of the small earthquakes occurred in the sedimentary cover,but the majority of earthquakes with bigger magnitude occurred in the upper crystalline crust.The earthquake swarm ruptures from crystalline crust to sedimentary cover along the N30°W direction.According to the characteristics of faults near the epicenter region and the distribution of historical earthquakes,two conjugate faults maybe exist in the Kezir reservoir region,and the right fault may be the causative fault of earthquake swarm.
The Kezir earthquake swarm occurred on Sep.23,2005 was relocated with the double different earthquake location algorithm.The result shows that distribution of the earthquake and aftershocks is in a rectangle with long margin of 14.5 km and width margin of 9.0 km,and the direction of long axis is N30°W,it nearly parallel to the Kezir fault.The depth is distributed within 21 km,and the most are concentrated between 10~19 km,the average depth is 13.6 km;most of the small earthquakes occurred in the sedimentary cover,but the majority of earthquakes with bigger magnitude occurred in the upper crystalline crust.The earthquake swarm ruptures from crystalline crust to sedimentary cover along the N30°W direction.According to the characteristics of faults near the epicenter region and the distribution of historical earthquakes,two conjugate faults maybe exist in the Kezir reservoir region,and the right fault may be the causative fault of earthquake swarm.
引文
[1]沈军,吴传勇,李军,等.库车坳陷活动构造的基本特征[J].地震地质,2006,28(2):269-278.
[2]新疆维吾尔自治区地震局.天山地震目录及中强震震源机制解[J].内陆地震,1997,11(增刊):1-7.
[3]刘洁,曲国胜,童晓光,等.库车坳陷深浅构造变形与地震关系浅析[J].地震地质,2002,26(2):236-247.
[4]彭伯云.克孜尔水库活动断裂特征及其对工程影响[J].岩土工程学报,1993,15(3):106-110.
[5]杨又陵,杨欣.新疆克孜尔震群活动与水库蓄水关系研究[J].内陆地震,1996,10(2):147-154.
[6]杨志荣,王建新,王冬珠,等.1995年1月克孜尔水库小震群考察研究[J].内陆地震,10(3):245-250.
[7]尹力峰,唐利华,王海涛,等.克孜尔水库大坝的地震动力反应分析[J].世界地震工程,2002,18(4):167-172.
[8]雷小牛,邓铭江,李兰奇,等.新疆克孜尔水库地震风险分析及防范研究[J].中国安全学报,2005,15(11):96-102.
[9]曲延军,李志海,杨成荣.2005年9月新疆克孜尔震群活动特征分析与震后趋势判定[J].内陆地震,2007,21(1):19-27.
[10]邵学钟,张家茹,范会吉,等.天山造山带地壳结构与构造[J].地球物理学报,1996,39(3):336-346.
[11]张家茹,邵学钟,范会吉.塔里木盆地中部地震转换波测深及其解释[J].地震地质,1998,20(1):34-42.
[12]Waldhauser F,Ellsworth W L.A double-difference earthquake location algorithm:method and ap-plication to the northern Hayward Fault,California[J].Bull Seism Soc Am,2000,90(6):1 353-1 368.
[13]马秀芳.用相对定位法测定1973年霍山震群的震源位置[J].地震研究,1982,5(1):99-113.
[14]杨智娴,陈运泰,郑月军,等.双差地震定位法在我国中西部地区地震精确定位中的应用[J].中国科学(D辑),2003,33(增刊):129-136.
[15]李志海,赵翠萍,王海涛,等.双差地震定位法在北天山地区地震精确定位中的初步应用[J].内陆地震,2004,18(2):146-153.
[16]朱艾斓,徐锡伟,周永胜,等.川西地区小震重新定位及其活动构造意义[J].地球物理学报,2005,48(3):629-636.
[17]王海涛,李志海,赵翠萍,等.新疆北天山地区MS≥2.0地震震源参数的重新测定[J].中国地震,2007,23(1):47-55.
[18]新疆维吾尔自治区地方志编纂委员会.新疆通志.地震志[M].乌鲁木齐:新疆人民出版社,2002.
[19]卢华复,贾东,陈楚铭,等.库车新生代构造性质和变形时间[J].地学前缘,1999,6(4):215-221.
[20]张明利,谭成轩,汤良杰,等.塔里木盆地库车坳陷中新生代构造应力场分析[J].地球学报,2004,25(6):615-619.
[2]新疆维吾尔自治区地震局.天山地震目录及中强震震源机制解[J].内陆地震,1997,11(增刊):1-7.
[3]刘洁,曲国胜,童晓光,等.库车坳陷深浅构造变形与地震关系浅析[J].地震地质,2002,26(2):236-247.
[4]彭伯云.克孜尔水库活动断裂特征及其对工程影响[J].岩土工程学报,1993,15(3):106-110.
[5]杨又陵,杨欣.新疆克孜尔震群活动与水库蓄水关系研究[J].内陆地震,1996,10(2):147-154.
[6]杨志荣,王建新,王冬珠,等.1995年1月克孜尔水库小震群考察研究[J].内陆地震,10(3):245-250.
[7]尹力峰,唐利华,王海涛,等.克孜尔水库大坝的地震动力反应分析[J].世界地震工程,2002,18(4):167-172.
[8]雷小牛,邓铭江,李兰奇,等.新疆克孜尔水库地震风险分析及防范研究[J].中国安全学报,2005,15(11):96-102.
[9]曲延军,李志海,杨成荣.2005年9月新疆克孜尔震群活动特征分析与震后趋势判定[J].内陆地震,2007,21(1):19-27.
[10]邵学钟,张家茹,范会吉,等.天山造山带地壳结构与构造[J].地球物理学报,1996,39(3):336-346.
[11]张家茹,邵学钟,范会吉.塔里木盆地中部地震转换波测深及其解释[J].地震地质,1998,20(1):34-42.
[12]Waldhauser F,Ellsworth W L.A double-difference earthquake location algorithm:method and ap-plication to the northern Hayward Fault,California[J].Bull Seism Soc Am,2000,90(6):1 353-1 368.
[13]马秀芳.用相对定位法测定1973年霍山震群的震源位置[J].地震研究,1982,5(1):99-113.
[14]杨智娴,陈运泰,郑月军,等.双差地震定位法在我国中西部地区地震精确定位中的应用[J].中国科学(D辑),2003,33(增刊):129-136.
[15]李志海,赵翠萍,王海涛,等.双差地震定位法在北天山地区地震精确定位中的初步应用[J].内陆地震,2004,18(2):146-153.
[16]朱艾斓,徐锡伟,周永胜,等.川西地区小震重新定位及其活动构造意义[J].地球物理学报,2005,48(3):629-636.
[17]王海涛,李志海,赵翠萍,等.新疆北天山地区MS≥2.0地震震源参数的重新测定[J].中国地震,2007,23(1):47-55.
[18]新疆维吾尔自治区地方志编纂委员会.新疆通志.地震志[M].乌鲁木齐:新疆人民出版社,2002.
[19]卢华复,贾东,陈楚铭,等.库车新生代构造性质和变形时间[J].地学前缘,1999,6(4):215-221.
[20]张明利,谭成轩,汤良杰,等.塔里木盆地库车坳陷中新生代构造应力场分析[J].地球学报,2004,25(6):615-619.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心