RELOCATIONS AND FOCAL MECHANISM SOLOTIONS OF MS5.5 QIANGUO EARTHQUAKE SWARM IN JILIN PROVINCE IN 2013

doi:10.3969/j.issn.0253-4967.2017.05.008

Abstract

Abstract: We relocated a seismic swarm, which started in a mass from 31 October, 2013 in Qianguo County of Jilin Province, by using double difference location method, based on the phase data of regional digital seismic network and the crustal velocity model of Sunliao Basin. The characteristics of seismogenic fault have been investigated based on the spatial distribution image of the seismic swarm and the geophysical data near the epicenter area. The relocated epicenters of the swarm earthquakes have a precision of 0.9km in E-W, 0.7km in N-S and 1.2km in U-D direction, and show an apparent concentrated seismic belt trending N-W, with a length and width of 12km and 6km, respectively. The source depths of all events are shallow, with 80%in a range of 6~8km, and the events are apparently crowded together on the depth cross section. According to the relocated spatial distribution characteristics of the seismic swarm, the features that the medium size events happened successively, and the focal mechanism of the large size events in the swarm, we infer that the seismogenic tectonics of Qianguo seismic swarm is the thrust nappe structure inside the Keshan-Da'an fault zone. The fault plane inclines to the East direction, and is steep when close to the ground surface, which shows the typical characteristics of a listric thrust fault. The longitudinal length of the rupture plane is greater than the transverse length. According to the features of seismogenic tectonics, we infer that the three M_S ≥ 5.0 earthquakes occurred at the lower layer of the thrust rupture surface of the fault, while the aftershocks were triggered by the three events and occurred mainly at the upper layer of the rupture surface.

Key words: Qianguo seismic swarm, double difference relocation, Songliao Basin, nappe structure

摘要： 基于区域数字地震台网的震相资料、松辽盆地中部地壳速度结构，使用双差定位方法对2013年10月31日开始的吉林省前郭爆发性震群序列进行重新定位。根据重新定位后的地震群空间分布图像结合震中区附近的物探资料探讨发震构造的特征。重定位后EW、NS和UD 3个方向大致的定位精度分别为0.9km、0.7km和1.2km，地震序列震呈NW向密集条带状分布，长度约12km，正交NE向，宽约6km。震群序列中地震震源深度较浅，80%的地震分布在6~8km深度范围内，在深度剖面上震群序列表现为明显的密集现象。根据重新定位后震群序列的空间分布特征、序列中等震连发特征以及较大级别地震的震源机制解，推断发震构造为克山-大安断裂带内的推覆逆冲构造。冲断面向E倾斜，近地表倾角较陡，深部几乎平直，表现为典型的铲形逆冲断层的特征，断层面纵向破裂长度大于横向破裂长度。根据发震构造的特征可以推断3个5级地震发生在下层冲断面上，余震主要在冲断面上部触发。

关键词: 前郭震群, 双差定位方法, 松辽盆地, 推覆构造

CLC Number:

P315.2

LIU Jun-qing, GAN Wei-jun, LIU Cai, ZHANG Chen-xia, GAO Jin-zhe, LIANG Shi-ming. RELOCATIONS AND FOCAL MECHANISM SOLOTIONS OF M_S5.5 QIANGUO EARTHQUAKE SWARM IN JILIN PROVINCE IN 2013[J]. SEISMOLOGY AND GEOLOGY, 2017, 39(5): 981-993.

刘俊清, 甘卫军, 刘财, 张晨侠, 高金哲, 梁诗明. 2013年吉林前郭M_S5.5震群的双差法重新定位及震源机制[J]. 地震地质, 2017, 39(5): 981-993.

References

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 Sun-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).
傅维洲, 杨宝俊, 刘财, 等. 1998. 中国满洲里-绥芬河地学断面地震学研究［J］. 长春科技大学学报, 28(2):206-212. FU Wei-zhou, YANG Bao-jun, LIU Cai, et al. 1998. Study on the seismology in Manzhouli-Suifenhe geoscience transect of China ［J］. Journal of Changchun University of Science and Technology, 28(2):206-212(in Chinese).
高金哲, 包丰, 崇加军, 等. 2013. 2006年吉林乾安-前郭5.0级地震深度及其成因探讨［J］. 地球物理学进展, 28(5):2328-2335. GAO Jin-zhe, BAO Feng, CHONG Jia-jun, et al. 2013. Resolving focal depth of the 31 March 2006 Jilin Qian'an-Qianguo earthquake with multiple datasets and its implication for seismogenesis ［J］. Progress in Geophysics, 28(5):2328-2335(in Chinese).
蒋海昆, 曲延军, 李永莉, 等. 2006. 中国大陆中强地震余震序列的部分统计特征［J］. 地球物理学报, 49(4):1110-1117. JIANG Hai-kun, QU Yan-jun, LI Yong-li, et al. 2006. Some statistic features of aftershock sequences in Chinese mainland ［J］. Chinese Journal of Geophysics, 49(4):1110-1117(in Chinese).
蒋海昆, 郑建常, 吴琼, 等. 2007. 中国大陆中强以上地震余震分布尺度的统计特征［J］. 地震学报, 29(2):151-164. JIANG Hai-kun, ZHENG Jian-chang, WU Qiong, et al. 2007. Statistical features of aftershock distribution size for moderate and large earthquakes in Chinese mainland ［J］. Acta Seismologica Sinica, 29(2):151-164(in Chinese).
李传友, 汪一鹏, 张良怀, 等. 1999. 吉林省松原地区1119年6¾级地震的发震构造条件［J］. 中国地震, 15(3):237-246. LI Chuan-you, WANG Yi-peng, ZHANG Liang-huai, et al. 1999. Causative tectonic conditions of the historic earthquake(M=6 ¾)in 1119 in Songyuan area ［J］. Earthquake Research in China, 15(3):237-246(in Chinese).
刘财, 杨宝俊, 鹿琪, 等. 2012. 黑龙江板块构造地球物理研究基本进展［J］. 吉林大学学报(地球科学版), 42(5):1497-1505. LIU Cai, YANG Bao-jun, LU Qi, et al. 2012. Fundamental geophysical progress on Heilongjiang plate tectonics ［J］. Journal of Jilin University(Earth Science Edition), 42(5):1497-1505(in Chinese).
卢造勋, 刘建华. 2002. 中朝地台东北缘地区的地震层析成像［J］. 地球物理学报, 45(3):338-351. LU Zao-xun, LIU Jian-hua. 2002. Seismic tomography in the northeast margin area of Sino-Korean platform ［J］. Chinese Journal of Geophysics, 45(3):338-351(in Chinese).
单伟, 刘少峰, 吴键. 2009. 松辽盆地南缘长岭凹陷断陷层的构造特征与应变模式［J］. 地质通报, 28(4):431-438. SHAN Wei, LIU Shao-feng, WU Jian. 2009. Tectonic feature and strain pattern of Changling sag on the southern edge of Songliao Basin, China ［J］. Geological Bulletin of China, 28(4):431-438(in Chinese).
单新建, 何玉梅, 朱燕, 等. 2002. 伽师强震群震源破裂特征的初步分析［J］. 地球物理学报, 45(3):416-425. SHAN Xin-jian, HE Yu-mei, ZHU Yan, et al. 2002. A preliminary analysis on rupture characteristics of Jiashi strong earthquake swarm ［J］. Chinese Journal of Geophysics, 45(3):416-425(in Chinese).
单玄龙, 秦树洪, 张艳, 等. 2009. 松辽盆地北部浅部基底推覆伸展作用的地震学证据与地质意义［J］. 地球物理学报, 52(8):2044-2049. SHAN Xuan-long, QIN Shu-hong, ZHANG Yan, et al. 2009. Seismic evidence and geological significance of thrust-extension structure in upper basement of north Songliao Basin ［J］. Chinese Journal of Geophysics, 52(8):2044-2049(in Chinese).
唐雅芝. 1988. 1119年吉林省地震震中的确定［J］. 遥感信息, (1):27-29, 12. TANG Ya-zhi. 1988. Determination of location of epicenter of the 1119 earthquake in Jilin Province ［J］. Remote Sensing Information, (1):27-29, 12(in Chinese).
唐雅芝. 1990. 公元1119年2月吉林省前郭强震三要素的确定［J］. 东北师大学报自然科学版, (3):151-159. TANG Ya-zhi. 1990. Three essential factors of a severe earthquake in Qianguo of Jilin Province in February, 1119 ［J］. Journal of Northeast Normal University, (3):151-159(in Chinese).
万永革, 沈正康, 刁桂苓, 等. 2008. 利用小震分布和区域应力场确定大震断层面参数方法及其在唐山地震序列中的应用［J］. 地球物理学报, 51(3):793-804. WAN Yong-ge, SHEN Zheng-kang, DIAO Gui-ling, et al. 2008. An algorithm of fault parameter determination using distribution of small earthquakes and parameters of regional stress field and its application to Tangshan earthquake sequence ［J］. Chinese Journal of Geophysics, 51(3):793-804(in Chinese).
吴戈, 房贺岩, 李志田, 等. 1988. 1119年前郭地震考察与研究［J］. 东北地震研究, 4(1):67-76. WU Ge, FANG He-yan, LI Zhi-tian, et al. 1988. The investigation and study of Qianguo earthquake, 1119 ［J］. Northeastern Seismological Research, 4(1):67-76(in Chinese).
吴开统. 1990. 地震序列概论［M］. 北京:北京大学出版社:85. WU Kai-tong. 1990. Introduction to Earthquake Sequences ［M］. Beijing:Beijing University Press:85(in Chinese).
徐锡伟, 闻学泽, 韩竹军, 等. 2013. 四川芦山7.0级强震:一次典型的盲逆断层型地震［J］. 科学通报, 58(20):1887-1893. XU Xi-wei, WEN Xue-ze, HAN Zhu-jun, et al. 2013. Lushan M_S7.0 earthquake:A blind reserve-fault event ［J］. Chinese Science Bulletin, 58(20):1887-1893(in Chinese).
杨宝俊, 穆石敏, 金旭, 等. 1996. 中国满洲里-绥芬河地学断面地球物理综合研究［J］. 地球物理学报, 39(6):772-782. YANG Bao-jun, MU Shi-min, JIN Xu, et al. 1996. Synthesized study on the geophysics of Manzhouli-Suifenhe geoscience transect, China ［J］. Acta Geophysica Sinica, 39(6):772-782(in Chinese).
杨成荣, 单新建, 何玉梅, 等. 2002. 伽师强震群震源机制与区域应力场特征［J］. 地震, 22(3):89-94. YANG Cheng-rong, SHAN Xin-jian, HE Yu-mei, et al. 2002. Focal mechanism of Jiashi strong earthquake swarm and characteristics of the regional stress field ［J］. Earthquake, 22(3):89-94(in Chinese).
余中元, 闵伟, 韦庆海, 等. 2015. 松辽盆地北部反转构造的几何特征、变形机制及其地震地质意义:以大安-德都断裂为例［J］. 地震地质, 37(1):13-32. doi:10.3969/j.issn.0253-4967.2015.01.002. YU Zhong-yuan, MIN Wei, WEI Qing-hai, et al. 2015. The geometric characteristics and tectonic deformation mechanism of inversion structures in northern Songliao Basin and their seismogeological significance:A case from Da'an-Dedu Fault ［J］. Seismology and Geology, 37(1):13-32(in Chinese).
张洪艳, 高金哲, 卢燕红, 等. 2010. 吉林地区平均波速比的测定及研究［J］. 防灾减灾学报, 26(4):30-34. ZHANG Hong-yan, GAO Jin-zhe, LU Yan-hong, et al. 2010. The measurement and research of average wave velocity ratio in Jilin Province ［J］. Journal of Disaster Prevention and Reduction, 26(4):30-34(in Chinese).
赵博, 石玉涛, 高原. 2011. 汶川M_S8.0地震及余震序列重新定位［J］. 地震, 31(2):1-10. ZHAO Bo, SHI Yu-tao, GAO Yuan. 2011. Relocation of the Wenchuan M_S8.0 earthquake sequence ［J］. Earthquake, 31(2):1-10(in Chinese).
中国地震局监测预报司编. 1998. 地震现场工作大纲和技术指南［M］. 北京:地震出版社:25. Department of Earthquake Monitoring and Prediction, China Earthquake Administration. 1998. Outline and Technical Guide for Earthquake Field Work ［M］. Beijing:Seismological Press:25(in Chinese).
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［J］. 地球物理学报, 44(5):654-662. ZHOU Shi-yong, XU Zhong-huai, CHEN Xiao-fei. 2001. Analysis on the source characteristics of the 1997 Jiashi swarm, western China ［J］. Chinese Journal of Geophysics, 44(5):654-662(in Chinese).
Frohlich C. 1992. Triangle diagrams:Ternary graphs to display similarity and diversity of earthquake focal mechanisms ［J］. Physics of the Earth and Planetary Interiors, 75(1-3):193-198.
Kagan Y Y. 1991. 3-D rotation of double-couple earthquake sources ［J］. Geophysical Journal International, 106(3):709-716.
Shen J, Shao B, Yu X H, et al. 2016. Seismogenic tectonics of the Qian-Gorlos earthquake in Jilin Province, China ［J］. Earthquake Science, 29(2):93-103.
Vavry A? uk V. 2001. Inversion for parameters of tensile earthquakes ［J］. Journal of Geophysical Research, 106(B8):16339-16355.
Waldhauser F, Ellsworth W L. 2000. A double-difference earthquake location algorithm:Method and application to the northern Hayward Fault, California ［J］. Bulletin of the Seismological Society of America, 90(6):1353-1368.
Yang B J, Liu C, Han L G, et al. 1997. A study of detachment faults of the upper crust in Manzhouli-Suifenhe GGT by the method of vertical seismic reflection//Proceedings of the 30th International Geological Congress. Utrecht, the Netherlands:VSP:51-61.
Zhao L S, Helmberger D V. 1994. Source estimation from broadband regional seismograms ［J］. Bulletin of the Seismological Society of America, 84(1):91-104.
Zhu L P, Ben-Zion Y. 2013. Parametrization of general seismic potency and moment tensors for source inversion of seismic waveform data ［J］. Geophysical Journal International, 194(2):839-843.

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