FOCAL MECHANISMS AND SEISMOGENIC STRUCTURES OF THE MS4.6 RUICHANG-YANGXIN EARTHQUAKE OF 2011

doi:10.3969/j.issn.0253-4967.2013.02.008

Abstract

Abstract:

Ruichang-Yangxin earthquake is another moderate-size earthquake in the Yangxin-Jiujiang area since the M5.7 Jiujiang-Ruichang earthquake in 2005.In order to have a better understanding of the seismic activities in this area,we investigate the moment tensor solution and the seismogenic structure of Ruichang-Yangxin earthquake. Precise earthquake relocation shows that the main shock occurred on the southwestern part of the NE-trending fault and aftershocks are distributed along both NNE and NW directions. By comprehensive analysis of the earthquake distribution,isoseismal features,focal mechanism,and regional structure characteristics,it is inferred that the this earthquake is caused by the southern segment of the NNE-trending Tanlu Fault(TLF).In addition,it has close relationship with the conjugated NW-trending fault as well.

Key words: moment tensor inversion, Ruichang-Yangxin earthquake, seismogenic structure

摘要：

2011年M_S 4.6瑞昌-阳新地震是瑞昌地区继2005年M5.7地震后的又一中等强度地震,文中从多角度对此次地震的发震构造进行了探讨.利用双差定位法进行的地震精定位结果显示,主震发生在NE向断裂的西南端,余震的分布则呈现出沿NNE和NW两个方向展布的特征.野外考察发现,等震线长轴方向为NE,沿此方向烈度衰减较慢.考虑震源时间函数的影响,采用波形反演方法得到了此次地震的震源机制解.节面Ⅰ走向302.2°,倾角68.2°,滑动角-3.8°; 节面Ⅱ走向33.6°,倾角86.5°,滑动角-158.1°. 综合分析认为,NNE向郯庐断裂的南端隐伏段(瑞昌-武穴断裂)为此次地震的发震构造,而与NW向断裂的共轭作用造成了部分余震沿着NW向分布的特征.

关键词: 矩张量反演, 瑞昌-阳新地震, 发震构造

CLC Number:

P315.2

ZHANG Li-fen, YAO Yun-sheng, LIAO Wu-lin. FOCAL MECHANISMS AND SEISMOGENIC STRUCTURES OF THE M_S4.6 RUICHANG-YANGXIN EARTHQUAKE OF 2011[J]. SEISMOLOGY AND GEOLOGY, 2013, 35(2): 290-299.

张丽芬, 姚运生, 廖武林. 2011年M_S4.6瑞昌-阳新地震的震源机制及发震构造探讨[J]. 地震地质, 2013, 35(2): 290-299.

References

曹洛华.1987.鄂东深部地质初步探讨［J］.湖北地质,(1): 1—10.
CAO Luo-hua.1987.A preliminary approach to the deep-seated geology of eastern Hubei ［J］.Hubei Geology,(1): 1—10(in Chinese).
陈璘.2009.襄樊-广济断裂湖北段构造特征研究［J］.石油实验地质,31(2): 186—191.
CHEN Lin.2009.Study of structural characteristics of Xiangfan-Guangji Fault in Hubei Province ［J］.Petroleum Geology & Experiment,31(2): 186—191(in Chinese).
崔学军,陈祥云,杨建国,等.2002.广济-九江同步耦合断裂及其控岩、控矿作用［J］.地质科技情报,21(3): 1—6.
CUI Xue-jun,CHEN Xiang-yun,YANG Jian-guo,et al.2002.Guangji-Jiujiang synchro-coupling fault and its property to control the magmanism and mineralization in Jiujiang-Ruichang mineralization belt,Jiangxi Province ［J］.Geological Science and Technology Information,21(3): 1—6(in Chinese).
侯明金,王永敏,Jacques Mercier,等.2003.郯庐断裂带安徽部分动力学演化及其构造意义［J］.地质通报,22(2): 105—113.
HOU Ming-jin,WANG Yong-min,Jacques Mercier,et al.2003.Dynamic evolution and tectonic significance of the Tanlu Fault zone(Anhui segment)［J］.Geological Bulletin of China,22(2): 105—113(in Chinese).
李传友,曾新福,张剑玺.2008.2005年江西九江5.7级地震构造背景与发震构造［J］.中国科学(D辑),38(3): 343—354.
LI Chuan-you,ZENG Xin-fu,ZHANG Jian-xi.2008.Seismo-tectonic background and seismogenic structure of 2005 Jiujiang M5.7 earthquake in Jiangxi Province ［J］.Science in China(Ser D),38(3): 343—354(in Chinese).
刘和甫,夏义平,进垠,等.1999.走滑造山带与盆地耦合机制［J］.地学前缘,6(3): 121—132.
LIU He-fu,XIA Yi-ping,JIN Yin,et al.1999.Coupling mechanism of strike-slip orogen and basin ［J］.Earth Science Frontiers,6(3): 121—132(in Chinese).
吕坚,郑勇,倪四道,等.2008.2005年11月26日九江-瑞昌M_S 5.7、M_S 4.8地震的震源机制解与发震构造研究［J］.地球物理学报,25(1): 158—164.
LV Jian,ZHENG Yong,NI Si-dao,et al.2008.Focal mechanisms and seismogenic structures of the M_S5.7 and M_S4.8 Jiujiang-Ruichang earthquakes of Nov.26,2005 ［J］.Chinese J Geophys,25(1): 158—164(in Chinese).
吕坚,曾文敬,谢祖军,等.2012.2011年9月10日瑞昌-阳新4.6级地震的震源破裂特征与区域强震危险性［J］.地球物理学报,55(11): 3625—3633.
LV Jian,ZENG Wen-jing,XIE Zu-jun,et al.2012.Rupture characteristics of the M_S4.6 Ruichang-Yangxin earthquake of Sept.10,2011 and the strong earthquake risk in the region ［J］.Chinese J Geophys,55(11): 3625—3633(in Chinese).
汤加富,李怀坤,娄清.2003.郯庐断裂南段研究进展与断裂性质讨论［J］.地质通报,22(6): 426—436.
TANG Jia-fu,LI Huai-kun,LOU Qing.2003.Progress in the study of the southern segment of the Tanlu Fault and a discussion of the nature of the fault ［J］.Geological Bulletin of China,22(6): 426—436(in Chinese).
童卫星.1987.鄂皖边境郯庐断裂带南端尾端变形特征的探讨［J］.地质科学,(3): 199—208.
TONG Wei-xing.1987.Research on deformation of the fault termination in the southern segment of the Tancheng-Lujiang Fault zone,the border of Anhui and Hubei Provinces ［J］.Scientia Geologica Sinica,(3): 199—208(in Chinese).
万桂梅,汤良杰,金文正,等.2009.郯庐断裂带研究进展及存在问题探讨［J］. 地质论评,55(2): 251—259.
WAN Gui-mei,TANG Liang-jie,JIN Wen-zheng,et al.2009.Progresses and problems in the study of Tancheng-Lujiang Fault zone ［J］.Geological Review,52(2): 251—259(in Chinese).
王椿镛,丁志峰,宋建立,等.1997a.大别造山带地壳S波速度结构［J］. 地球物理学报,40(3): 337—346.
WANG Chun-yong,DING Zhi-feng,SONG Jian-li,et al.1997a.Shear wave velocity structure in Dabieshan orogenic belt ［J］.Chinese J Geophys,40(3): 337—346(in Chinese).
王椿镛,张先康,陈步云,等.1997b.大别造山带地壳结构研究［J］. 中国科学(D辑),27(3): 221—226.
WANG Chun-yong,ZHANG Xian-kang,CHEN Bu-yun,et al.1997b.Crustal structure in Dabieshan orogenic belt ［J］.Science in China(Ser D),27(3): 221—226(in Chinese).
徐嘉炜.1995.论走滑断层作用的几个主要问题［J］.地学前缘,2(2): 125—136.
XU Jia-wei.1995.Some major problems on strike-slip faulting ［J］.Earth Science Frontiers,2(2): 125—136(in Chinese).
徐嘉炜,马国锋.1992.郯庐断裂研究的十年回顾［J］.地质论评,38(4): 316—324.
XU Jia-wei,MA Guo-feng.1992.Review of ten years of research on the Tancheng-Lujiang Fault zone ［J］.Geological Review,38(4): 316—324(in Chinese).
张爱萍,倪四道,杨晓勇. 2008. 2004年东乌珠穆沁旗地震震源参数研究［J］.地震,28(3):61—69.
ZHANG Ai-ping, NI Si-dao, YANG Xiao-yong. 2008. Source parameters of 2004-03-24 Xilingol League earthquake ［J］. Earthquake, 28(3):61—69(in Chinese).
Aki K,Richards P G.1980.Quantitative Seismology: Theory and Methods ［M］.Freeman,San Francisco. 932.
Dziewonski A M,Chou T A,Woodhouse J H.1981.Determination of earthquake source parameters from waveform data for studies of global and regional seismicity ［J］.J Geophys Res,86:2825—2852.
Kennett B L N, Engdahl E R. 1991. Travel times for global earthquake location and phase identification ［J］. Geophys J Int, 105:429—465.
Kikuchi M,Kanamori H.1991.Inversion of complex body waves Ⅲ ［J］.Bull Seismol Soc Am, 81: 2335—2350.
Kisslinger C.1980.Evaluation of S to P amplitude ratio for determining focal mechanism from regional network observations ［J］.Bull Seism Soc Am,70:999—1014.
Kohketsu K.1985.The extended reflectivity method for synthetic near-field seismograms ［J］.J Phys Earth,33: 121—131.
ZHAO L S,Helmgerger D V.1994.Source estimation from broadband regional seismograms ［J］.Bull Seism Soc Am,84(1):91—104.
ZHU L P,Helmgerger D V.1996.Advancement in source estimation techniques using broadband regional seismograms ［J］. Bull Seism Soc Am,86(5):1634—1641.

[1]	LIU Bai-yun, ZHAO Li, LIU Yun-yun, WANG Wen-cai, ZHANG Wei-dong. THE RESEARCH ON RELOCATION AND FAULT PLANE SOLUTION AND GEOMETRIC MEANING OF THE MADUO M7.4 EARTHQUAKE ON 22 MAY 2021 [J]. SEISMOLOGY AND GEOLOGY, 2023, 45(2): 500-516.
[2]	ZHAO De-zheng, QU Chun-yan, ZHANG Gui-fang, GONG Wen-yu, SHAN Xin-jian, ZHU Chuan-hua, ZHANG Guo-hong, SONG Xiao-gang. APPLICATIONS AND ADVANCES FOR THE COSEISMIC DEFORMA-TION OBSERVATIONS, EARTHQUAKE EMERGENCY RESPONSE AND SEISMOGENIC STRUCTURE INVESTIGATION USING INSAR [J]. SEISMOLOGY AND GEOLOGY, 2023, 45(2): 570-592.
[3]	ZHANG Ke, WANG Xin, YANG Hong-ying, WANG Yue, XU Yan, LI Jing. THE CHARACTERISTICS AND SEISMOGENIC STRUCTURE ANALYSIS OF THE 2021 YANGBI M_S6.4 EARTHQUAKE SEQUENCE, YUNNAN [J]. SEISMOLOGY AND GEOLOGY, 2023, 45(1): 231-251.
[4]	LI Chuan-you, SUN Kai, MA Jun, LI Jun-jie, LIANG Ming-jian, FANG Li-hua. THE 2022 M6.8 LUDING EARTHQUAKE: A COMPLICATED EVENT BY FAULTING OF THE MOXI SEGMENT OF THE XIANSHUIHE FAULT ZONE [J]. SEISMOLOGY AND GEOLOGY, 2022, 44(6): 1648-1666.
[5]	ZHANG Bo-xuan, ZHENG Wen-jun, CHEN Jie, HE Xiao-hui, LI Qi-lei, ZHANG Dong-li, DUAN Lei, CHEN Gan. ANALYSIS OF THE SEISMOGENIC STRUCTURE OF THE JUNE 2021 M_S5.8 MANG’AI EARTHQUAKE IN NORTHERN QAIDAM BASIN [J]. SEISMOLOGY AND GEOLOGY, 2022, 44(5): 1313-1332.
[6]	YAO Sheng-hai, GAI Hai-long, YIN Xiang, LIU Wei, ZHANG Jia-qing, YUAN Jian-xin. A DISCUSSION ON THE RELATIONSHIP BETWEEN THE SUR-FACE RUPTURE ZONE IN FRONT OF THE AMUNIKESHAN MOUNTAIN AND THE 1962 M6.8 EARTHQUAKE [J]. SEISMOLOGY AND GEOLOGY, 2022, 44(4): 976-991.
[7]	LIANG Kuan, HE Zhong-tai, JIANG Wen-liang, LI Yong-sheng, LIU Ze-min. SURFACE RUPTURE CHARACTERISTICS OF THE MENYUAN M_S6.9 EARTHQUAKE ON JANUARY 8, 2022, QINGHAI PROVINCE [J]. SEISMOLOGY AND GEOLOGY, 2022, 44(1): 256-278.
[8]	GAO Fan, HAN Zhu-jun, YUAN Ren-mao, DONG Shao-peng, GUO Peng. FEATURES OF ANCIENT LANDSLIDES AND THEIR SEISMIC-GEOLOGICAL SIGNIFICANCE ALONG THE SOUTHERN SEGMENT OF XIAOJIANG FAULT IN THE SOUTHEASTERN YUNNAN, CHINA [J]. SEISMOLOGY AND EGOLOGY, 2021, 43(6): 1412-1434.
[9]	YAO Sheng-hai, GAI Hai-long, YIN Xiang, LI Xin. THE BASIC CHARACTERISTICS AND TYPICAL PHENOMENA OF THE SURFACE RUPTURE ZONE OF THE MADUO M_S7.4 EARTHQUAKE IN QINGHAI [J]. SEISMOLOGY AND EGOLOGY, 2021, 43(5): 1060-1072.
[10]	ZHAO Tao, WANG Ying, MA Ji, SHAO Ruo-tong, XU Yi-fei, HU Jing. RELOCATION AND FOCAL MECHANISM SOLUTIONS OF THE 2021 MADUO, QINGHAI M_S7.4 EARTHQUAKE SEQUENCE [J]. SEISMOLOGY AND EGOLOGY, 2021, 43(4): 790-805.
[11]	WANG Ying, ZHAO Tao, HU Jing, LIU Chun. RELOCATION AND FOCAL MECHANISM SOLUTIONS OF THE 2021 YANGBI, YUNNAN M_S6.4 EARTHQUAKE SEQUENCE [J]. SEISMOLOGY AND EGOLOGY, 2021, 43(4): 847-863.
[12]	JIA Rui, ZHANG Guo-hong, XIE Chao-di, SHAN Xin-jian, ZHANG Ying-feng, LI Cheng-long, HUANG Zi-cheng. COSEISMIC DEFORMATION FIELD AND FAULT SLIP MODEL OF THE M_W6.0 PAKISTAN EARTHQUAKE CONSTRAINED BY SENTINEL-1A SAR DATA [J]. SEISMOLOGY AND GEOLOGY, 2021, 43(3): 600-613.
[13]	ZHAO Qi-guang, SUN Ye-jun, HUANG Yun, YANG Wei-lin, GU Qin-ping, MENG Ke, YANG Hao. A STUDY ON THE SEISMOGENIC STRUCTURE OF GAOYOU-BAOYING M_S4.9 EARTHQUAKE [J]. SEISMOLOGY AND GEOLOGY, 2021, 43(3): 630-646.
[14]	GUO Zhi, GAO Xing, LU Zhen. RELOCATION AND FOCAL MECHANISM FOR THE XINJIANG JIASHI EARTHQUAKE ON 19 JANUARY, 2020 [J]. SEISMOLOGY AND GEOLOGY, 2021, 43(2): 345-356.
[15]	LI Qi-lei, LI Yu-li, TU Hong-wei, LIU Wen-bang. THE RELOCATION, FOCAL MECHANISMS OF THE DINGQING EARTHQUAKES AND A PRELIMINARY STUDY OF ITS SEISMOGENIC STRUCTURE [J]. SEISMOLOGY AND GEOLOGY, 2021, 43(1): 209-231.