利用CAP方法分析吉林松原4.9级地震震源机制
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摘要
地震震源机制解的确定,对于地震研究及孕震机理解释具有重要意义。近年来我国东北几次破坏性地震主要发生在吉林松原地区,分析震源机制,对认识该地区地质构造和孕震机理具有重要的科学价值。2017年7月23日吉林松原发生4.9级地震,利用CAP方法,反演得到此次地震震源机制解:节面Ⅰ:走向307.0°,倾角66.0°,滑动角12.0°;节面Ⅱ:走向212.1°,倾角79.1°,滑动角155.5°;震源深度6.9km,结果表明此次地震震源机制解类型为走滑型。
The determination of focal mechanism solution is of great significance to seismic research and interpretation of seismogenic mechanism. In recent years, several destructive earthquakes in Northeast China mainly occurred in Songyuan area of Jilin Province. The analysis of focal mechanism is of great scientific value for understanding the geological structure and seismogenic mechanism of this area. The focal mechanism solution of the 4.9 magnitude earthquake occurred in Songyuan, Jilin Province on July 23, 2017 was obtained by inversion using CAP method: nodal plane I: strike 307.0 degrees, dip 66.0 degrees, slip angle 12.0 degrees; nodal plane II: strike 212.1 degrees, dip 79.1 degrees, slip angle 155.5 degrees; focal depth 6.9 km. The results show that the focal mechanism solution type of the earthquake is strike-slip type.
The determination of focal mechanism solution is of great significance to seismic research and interpretation of seismogenic mechanism. In recent years, several destructive earthquakes in Northeast China mainly occurred in Songyuan area of Jilin Province. The analysis of focal mechanism is of great scientific value for understanding the geological structure and seismogenic mechanism of this area. The focal mechanism solution of the 4.9 magnitude earthquake occurred in Songyuan, Jilin Province on July 23, 2017 was obtained by inversion using CAP method: nodal plane I: strike 307.0 degrees, dip 66.0 degrees, slip angle 12.0 degrees; nodal plane II: strike 212.1 degrees, dip 79.1 degrees, slip angle 155.5 degrees; focal depth 6.9 km. The results show that the focal mechanism solution type of the earthquake is strike-slip type.
引文
崔效锋,谢富仁,赵建涛.中国及邻区震源机制解的分区特征[J].地震地质,2005,27(2):298-307.
洪德全,王行舟,韩立波,等.用CAP方法研究安庆4.8级地震震源机制[J].中国地震,2011,27(2):207-214.
康建红,郑国栋,张宇,等.2013年吉林前郭强震群序列的谱振幅相关系数变化特征[J].防灾减灾学报,2017,33(3):92-96.
李延兴,张静华,李智,等.太平洋板块俯冲对中国大陆的影响[J].测绘学报,2006,35(2):99-105.
吕坚,郑勇,倪四道,等. 2005年11月26日九江—瑞昌MS 5.7、MS 4.8地震的震源机制解与发震构造研究[J].地球物理学报,2008,51(1):158-164.
邵博,沈军,于晓辉,等.松原市扶余北隐伏活动断裂地震潜势研究[J].地震工程学报,2016,38(4):616-623.
宋美琴,李华玥,韩立波,等.用CAP方法反演2010年6月5日山西阳曲MS 4.6地震震源机制解[J].地震工程学报,2013,35(3):692-697.
王亮,李君,顾强强,等.吉林松原5级震群的重新定位研究[J].防灾减灾学报,2015,31(1):30-34.
吴宝峰. 2017年11月18日西藏米林6.9级地震震源机制[J].地震地磁观测与研究,2017,38(6):26-29.
薛艳,曾宪伟,刘桂萍,等. 2013年吉林前郭MS 5.8震群序列研究[J].中国地震,2015,31(3):481-491.
姚军,徐辉.用CAP方法研究久治—玛曲MS 4.1级地震震源机制[J].高原地震,2013,25(2):8-12.
朱元清,周丰森,等全国一维速度模型(西藏模型)[R].2015.
Zhao L S, Helmberger D V, Source Estimation from Broadband Regional Seismograms[J].Bull Seismol Soc Am, 1994, 84(1):91-104.
Zhu L P, Rivera L A A. Note on the Dynamic and Static Displacements from a Point Source in Multilayered Media[J]. Geophys,2002, 148:619-627.
洪德全,王行舟,韩立波,等.用CAP方法研究安庆4.8级地震震源机制[J].中国地震,2011,27(2):207-214.
康建红,郑国栋,张宇,等.2013年吉林前郭强震群序列的谱振幅相关系数变化特征[J].防灾减灾学报,2017,33(3):92-96.
李延兴,张静华,李智,等.太平洋板块俯冲对中国大陆的影响[J].测绘学报,2006,35(2):99-105.
吕坚,郑勇,倪四道,等. 2005年11月26日九江—瑞昌MS 5.7、MS 4.8地震的震源机制解与发震构造研究[J].地球物理学报,2008,51(1):158-164.
邵博,沈军,于晓辉,等.松原市扶余北隐伏活动断裂地震潜势研究[J].地震工程学报,2016,38(4):616-623.
宋美琴,李华玥,韩立波,等.用CAP方法反演2010年6月5日山西阳曲MS 4.6地震震源机制解[J].地震工程学报,2013,35(3):692-697.
王亮,李君,顾强强,等.吉林松原5级震群的重新定位研究[J].防灾减灾学报,2015,31(1):30-34.
吴宝峰. 2017年11月18日西藏米林6.9级地震震源机制[J].地震地磁观测与研究,2017,38(6):26-29.
薛艳,曾宪伟,刘桂萍,等. 2013年吉林前郭MS 5.8震群序列研究[J].中国地震,2015,31(3):481-491.
姚军,徐辉.用CAP方法研究久治—玛曲MS 4.1级地震震源机制[J].高原地震,2013,25(2):8-12.
朱元清,周丰森,等全国一维速度模型(西藏模型)[R].2015.
Zhao L S, Helmberger D V, Source Estimation from Broadband Regional Seismograms[J].Bull Seismol Soc Am, 1994, 84(1):91-104.
Zhu L P, Rivera L A A. Note on the Dynamic and Static Displacements from a Point Source in Multilayered Media[J]. Geophys,2002, 148:619-627.