RELOCATION OF THE AFTERSHOCK SEQUENCE OF THE MS6.5 LUDIAN EARTHQUAKE AND ITS SEISMOGENIC STRUCTURE

doi:10.3969/j.issn.0253-4967.2014.04.019

Abstract

Abstract:

We integrated two-month phase data recorded by Yunnan Seismic Network, Zhaotong Seismic Network, Qiaojia Seismic Array and temporal stations deployed around the Ludian earthquake source region and relocated the aftershock sequence of the Ludian earthquake. The locations of 1 750 aftershocks were determined using double-difference location algorithm. The relocation result shows that the aftershock distribution has two predominant directions, to the southeast and southwest, and shows itself as an asymmetric conjugate shape. The lengths of the two aftershock strips are about 16km. The angle between the two strips is about 100°. Aftershock distribution shows that the seismogenic fault of the Ludian earthquake is a high-angle strike-slip fault. The mainshock is located at the middle at southwest of the two aftershock strips. Early aftershocks are distributed mainly along the NW-SE direction, perpendicular to the Zhaotong-Ludian Fault. The aftershocks located to the southwest of the mainshock may be triggered by the mainshock. According to the aftershock distribution and its relations with neighboring faults, focal mechanism of the mainshock, the long axis orientation of seismic intensity map, and distribution of landslides, we speculate that the seismogenic fault is the Baogunao-Xiaohe Fault. There are significant differences not only in seismic activity, deep velocity structure, but also the block movement direction and rate on both sides of the Baogunao-Xiaohe Fault. The northward expansion of aftershock activity may be blocked by the high-velocity anomaly zone located on the north side of the Baogunao-Xiaohe Fault.

Key words: Ludian earthquake, aftershock sequence, earthquake relocation, seismogenic fault

摘要：

整合了鲁甸震区周边的云南省地震台网、昭通市地震台网、巧家台阵, 以及流动台站2个月的震相观测数据, 对鲁甸地震序列进行了重新定位, 得到了1 750个地震的震源参数.重定位结果显示, 余震有2个优势分布方向, 分别为SE向和SW向, 具有不对称的共轭分布特征.2个余震条带的展布长度相当, 约为16km, 夹角约100°.余震分布显示鲁甸地震的发震断层为高倾角的走滑断层.主震位于2个余震条带中间略偏西南的位置, 早期余震主要沿NW-SE向垂直于昭通-鲁甸断裂分布, 主震西南侧的余震可能为后期触发的.根据余震分布与周边断层的关系、主震震源机制、烈度分布的长轴方位, 以及滑坡分布等资料, 认为鲁甸地震的发震断层为NW向的包谷垴-小河断裂.包谷垴-小河断裂南北两侧无论是在地震活动、深部速度结构, 还是块体运动方向和速率方面都存在显著差异, 断裂北侧的高速异常可能是阻止余震向北继续扩展的主要原因.

关键词: 鲁甸地震, 余震序列, 地震定位, 发震断层

CLC Number:

P315.63

FANG Li-hua, WU Jian-ping, WANG Wei-lai, LÜ|Zuo-yong, WANG Chang-zai, YANG Ting, ZHONG Shi-jun. RELOCATION OF THE AFTERSHOCK SEQUENCE OF THE M_S6.5 LUDIAN EARTHQUAKE AND ITS SEISMOGENIC STRUCTURE[J]. SEISMOLOGY AND GEOLOGY, 2014, 36(4): 1173-1185.

房立华, 吴建平, 王未来, 吕作勇, 王长在, 杨婷, 钟世军. 云南鲁甸M_S6.5地震余震重定位及其发震构造[J]. 地震地质, 2014, 36(4): 1173-1185.

References

陈翰林, 赵翠萍, 修济刚, 等. 2009. 龙滩水库地震精定位及活动特征研究［J］. 地球物理学报, 52(8): 2035—2043. doi: 10.3969/j.issn.0001-5733.2009.08.011.
CHEN Han-lin, ZHAO Cui-ping, XIU Ji-gang, et al. 2009. Study on precise relocation of Longtan reservoir earthquakes and its seismic activity ［J］. Chinese Journal of Geophysics, 52(8): 2035—2043(in Chinese).
陈九辉, 刘启元, 李顺成, 等. 2009. 汶川M_S8.0地震余震序列重新定位及其地震构造研究［J］. 地球物理学报, 52(2): 390—397.
CHEN Jiu-hui, LIU Qi-yuan, LI Shun-cheng, et al. 2009. Seismotectonic study by relocation of the Wenchuan M_S8.0 earthquake sequence ［J］. Chinese Journal of Geophysics, 52(2): 390—397(in Chinese).
郭路杰, 蒋长胜, 韩立波. 2014. 2014年鲁甸M_S6.5地震序列参数的早期特征［J］. 地震研究, 37(4): 503—507.
GUO Lu-jie, JIANG Chang-sheng, HAN Li-bo. 2014. Parameter characteristics in the early stage of the 2014 Ludian M_S6.5 earthquake sequence ［J］. Journal of Seismological Research, 37(4): 503—507(in Chinese).
刘成利, 郑勇, 熊熊, 等. 2014. 利用区域宽频带数据反演鲁甸M_S6.5地震震源破裂过程［J］. 地球物理学报, 57(9): 3028—3037. doi: 10.6038/cjg20140927.
LIU Cheng-li, ZHENG Yong, XIONG Xiong, et al. 2014. Rupture process of M_S6.5 Ludian earthquake constrained by regional broadband seismograms ［J］. Chinese Journal of Geophysics, 57(9): 3028—3037(in Chinese).
王椿镛, Mooney W D, 王溪莉, 等. 2002. 川滇地区地壳上地幔三维速度结构研究［J］. 地震学报, 24(1): 1—16.
WANG Chun-yong, Mooney W D, WANG Xi-li, et al. 2002. Study on 3-D velocity structure of crust and upper mantle in Sichuan-Yunnan region, China ［J］. Acta Seismologica Sinica, 24(1): 1—16(in Chinese).
王未来, 吴建平, 房立华, 等. 2014. 2014年云南鲁甸M_S6.5地震序列的双差定位［J］. 地球物理学报, 57(9): 3042—3051. doi: 10.6038/cjg20140929.
WANG Wei-lai, WU Jian-ping, FANG Li-hua, et al. 2014. Double difference location of the Ludian M_S6.5 earthquake sequences in Yunnan Province in 2014 ［J］. Chinese Journal of Geophysics, 57(9): 3042—3051(in Chinese).
闻学泽, 杜方, 易桂喜, 等. 2013. 川滇交界东段昭通、莲峰断裂带的地震危险背景［J］. 地球物理学报, 56(10): 3361—3372. doi: 10.6038/cjg20131012.
WEN Xue-ze, DU Fang, YI Gui-xi, et al. 2013. Earthquake potential of the Zhaotong and Lianfeng Fault zones of the eastern Sichuan-Yunnan border region ［J］. Chinese J Geophys, 56(10): 3361—3372(in Chinese).
吴建平, 黄媛, 张天中, 等. 2009. 汶川8.0级地震余震分布及周边区域P波三维速度结构研究［J］. 地球物理学报, 52(2): 320—328.
WU Jian-ping, HUANG Yuan, ZHANG Tian-zhong, et al. 2009. Aftershock distribution of the M_S8.0 Wenchuan earthquake and 3-D P-wave velocity structure in and around source region ［J］. Chinese Journal of Geophysics, 52(2): 320—328(in Chinese).
熊绍柏, 郑晔, 尹周勋, 等. 1993. 丽江—攀枝花—者海地带二维地壳结构及其构造意义［J］. 地球物理学报, 36(4):434—444.
XIONG Shao-bai, ZHENG Ye, YIN Zhou-xun, et al. 1993. The 2-D structure and its tectonic implications of the crust in the Lijiang-Panzhihua-Zhehai region ［J］. Chinese J Geophys, 36(4):434—444(in Chinese).
徐涛, 张明辉, 田小波, 等. 2014. 丽江—清镇剖面上地壳速度结构及其与鲁甸M_S6.5地震孕震环境的关系［J］. 地球物理学报, 57(9): 3069—3079. doi: 10.6038/cjg20140932.
XU Tao, ZHANG Ming-hui, TIAN Xiao-bo, et al. 2014. Upper crustal velocity of Lijiang-Qingzhen profile and its relationship with the seismogenic environment of the M_S6.5 Ludian earthquake ［J］. Chinese Journal of Geophysics, 57(9): 3069—3079(in Chinese).
徐锡伟, 江国焰, 于贵华, 等. 2014. 鲁甸6.5级地震发震断层判定及其构造属性讨论［J］. 地球物理学报, 57(9): 3060—3068. doi: 10.6038/cjg20140931.
XU Xi-wei, JIANG Guo-yan, YU Gui-hua, et al. 2014. Discussion on seismogenic fault of the Ludian M_S6.5 earthquake and its tectonic attribution ［J］. Chinese Journal of Geophysics, 57(9): 3060—3068(in Chinese).
许冲. 2014. 鲁甸6.5级地震触发滑坡及其空间展布方向的发震构造限制［Z］. http: //www.eq-igl.ac.cn/wwwroot/c_000000090002/d_1413.html.
XU Chong. 2014. Seismogenic structure of the Ludian earthquake constrained by landslide distribution ［Z］. http: //www.eq-igl.ac.cn/wwwroot/c_000000090002/d_1413.html.
许力生, 张旭, 严川, 等. 2014. 基于勒夫波的鲁甸M_S6.5地震震源复杂性分析［J］. 地球物理学报, 57(9): 3006—3017. doi: 10.6038/cjg20140925.
XU Li-sheng, ZHANG Xu, YAN Chuan, et al. 2014. Analysis of the Love waves for the source complexity of the Ludian M_S6.5 earthquake ［J］. Chinese Journal of Geophysics, 57(9): 3006—3017(in Chinese).
张广伟, 雷建设, 梁姗姗, 等. 2014. 2014年8月3日云南鲁甸M_S6.5地震序列重定位与震源机制研究［J］. 地球物理学报, 57(9): 3018—3027. doi: 10.6038/cjg20140926.
ZHANG Guang-wei, LEI Jian-she, LIANG Shan-shan, et al. 2014. Relocations and focal mechanism solutions of the 3 August 2014 Ludian, Yunnan M_S6.5 earthquake sequence ［J］. Chinese Journal of Geophysics, 57(9): 3018—3027(in Chinese).
张培震, 邓起东, 张国民, 等. 2003. 中国大陆的强震活动与活动地块［J］. 中国科学(D 辑), 33(B04): 12—20.
ZHANG Pei-zhen, DENG Qi-dong, ZHANG Guo-min, et al. 2003. Active tectonic blocks and strong earthquakes in the continent of China ［J］. Science in China(Ser D), 46(S2): 13—24.
张勇, 许力生, 陈运泰, 等. 2014. 2014年8月3日云南鲁甸M_W6.1(M_S6.5)地震破裂过程［J］. 地球物理学报, 57(9): 3052—3059. doi: 10.6038/cjg20140930.
ZHANG Yong, XU Li-sheng, CHEN Yun-tai, et al. 2014. Rupture process of the 3 August 2014 Ludian, Yunnan, M_W6.1(M_S6.5)earthquake ［J］. Chinese Journal of Geophysics, 57(9): 3052—3059(in Chinese).
赵旭, 刘杰, 冯蔚, 等. 2014. 2014年云南鲁甸M_S6.5地震震源运动学特征［J］. 地震地质, 36(4): 1157—1172. doi: 10.3969/j.issn.0253-4967.2014.04.
ZHAO Xu, LIU Jie, FENG Wei, et al. 2014. The kinematic characteristics of the M_S6.5 Ludian Yunnan earthquake in 2014 ［J］. Seismology and Geology, 36(4): 1157—1172(in Chinese).
CHENG Jia, WU Zhongliang, LIU Jie, et al. 2014. Preliminary report on the 3 August 2014, M_W6.2/M_S6.5 Ludian, Yunnan-Sichuan border, southwest China, earthquake ［J］. Seismological Research Letters(in press).
Chi W C, Hauksson E. 2006. Fault-perpendicular aftershock clusters following the 2003 M_W=5.0 Big Bear, California, earthquake ［J］. Geophys Res Lett, 33: L07301. doi: 10.1029/2005GL025033.
Fang Li-hua, Wu Jian-ping, Wang Wei-lai, et al. 2013. Relocation of the mainshock and aftershock sequences of M_S7.0 Sichuan Lushan earthquake ［J］. Chin Sci Bull, 58: 3451—3459. doi: 10.1007/s11434-013-6000-2.
Fang Li-hua, Wu Jian-ping, Wang Chang-zai, et al. 2014. Relocation of the 2012 M_S6.6 Xinjiang Xinyuan earthquake sequence ［J］. Science in China(Ser D), 57: 216—220. doi: 10.1007/s11430-013-4755-6.
Freed A M. 2005. Earthquake triggering by static, dynamic, and postseismic stress transfer ［J］. Annu Rev Earth Planet Sci, 33: 335—367.
Jia Ke, Zhou Shi-yong, Wang Rui. 2012. Stress interactions within the strong earthquake sequence from 2001 to 2010 in the Bayankala block of eastern Tibet ［J］. Bull Seismol Soc Amer, 102(5): 2157—2164.
Kilb D, Rubin A M. 2002. Implications of diverse fault orientations imaged in relocated aftershocks of the Mount Lewis, M_L5.7, California, earthquake ［J］. J Geophys Res, 107(B11): 2294. doi: 10.1029/2001JB000149.
Lei J S, Zhang G W, Xie F R. 2014. The 20 April 2013 Lushan, Sichuan, mainshock, and its aftershock sequence: Tectonic implications ［J］. Earthquake Science, 27(1): 15—25.
Mendoza C, Hartzell S H. 1988. Aftershock patterns and main shock faulting ［J］. Bull Seismol Soc Amer, 78(4): 1438—1449.
Pei Shun-ping, Su Jin-rong, Zhang Hai-jiang, et al. 2010. Three-dimensional seismic velocity structure across the 2008 Wenchuan M_S8.0 earthquake, Sichuan, China ［J］. Tectonophysics, 491: 211—217.
Peng Ya-jun, Zhou Shi-yong, Zhuang Jian-cang, et al. 2012. An approach to detect the abnormal seismicity increase in southwestern China triggered co-seismically by 2004 Sumatra M_W9.2 earthquake ［J］. Geophys J Int, 189(3): 1734—1740.
Shearer P M. 1997. Improving local earthquake locations using the L1-norm and waveform cross-correlation: Application to the Whittier Narrows, California, aftershock sequence ［J］. J Geophys Res, 102: 8269—8283.
Tang Chi-chia, Lin Cheng-Horng, Peng Zhi-gang. 2014. Spatial-temporal evolution of early aftershocks following the 2010 M_L 6.4 Jiashian earthquake in southern Taiwan ［J］. Geophys J Int, 199: 1772—1783. doi: 10.1093/gji/ggu361.
Waldhauser F, Ellsworth W L. 2000. A double-difference earthquake location algorithm: Method and application to the northern Hayward Fault, California ［J］. Bull Seismol Soc Amer, 90: 1353—1368.
Wang Wei-lai, Wu Jian-ping, Fang Li-hua, et al. 2013. Relocation of the Yushu M_S7.1 earthquake and its aftershocks in 2010 from HypoDD ［J］. Science in China(Ser D), 56(2): 182—191.

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