永宁2次MS4.5地震震源机制及深度

doi:10.3969/j.issn.0253-4967.2017.01.015

地震地质 ›› 2017, Vol. 39 ›› Issue (1): 193-205.DOI: 10.3969/j.issn.0253-4967.2017.01.015

永宁2次M_S4.5地震震源机制及深度

金春华, 何秋菊, 田小慧

宁夏回族自治区地震局, 银川 750001

收稿日期:2015-04-08 修回日期:2016-10-14 出版日期:2017-02-20 发布日期:2017-04-26
作者简介:金春华,女,1979年生,2009年毕业于中国科学技术大学固体地球物理专业,获硕士学位,高级工程师,主要从事地下速度结构、地震震源参数等研究工作,联系电话:15009589049,E-mai:chunhua_jin19790@sina.com
基金资助:
中国地震局测震台网青年骨干培养专项（20140326）资助

RESEARCH OF FOCAL MECHANISM AND DEPTH OF TWOM_S4.5 EARTHQUAKES IN YONGNING

JIN Chun-hua, HE Qiu-ju, TIAN Xiao-hui

Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China

Received:2015-04-08 Revised:2016-10-14 Online:2017-02-20 Published:2017-04-26

摘要/Abstract

摘要：

2010年6月22日和2012年11月20日在宁夏回族自治区银川市永宁县发生了2次M_S4.5地震，在银川市及周边地区引起了强烈震感。为了更好地认识这2次地震的发震构造，利用宁夏及邻近几个省份区域台网的近震波形资料，首先通过Hyp2000绝对定位得到震中位置及余震震中分布；然后使用TDMT矩张量方法反演了震源机制解与震源深度。结果显示：2010年6月22日地震节面I走向208°，倾角89°，滑动角-164°，节面Ⅱ走向117°，倾角74°，滑动角-2°；2012年11月20日地震节面I走向284°，倾角79°，滑动角12°，节面Ⅱ走向192°，倾角78°，滑动角169°。综合Snoke法，得出这2次地震主控断层均为走向NNE、倾向NWW的右旋走滑断层；前者带有少量的拉张分量，后者带有少量逆冲分量，矩震级分别为M_W4.5和M_W4.3。根据Hyp2000精定位、TDMT矩张量拟合误差和sPn深度震相等3种方法确定最佳震源深度分别为22km和8km，均属浅源地震。从定位震中和震源机制解来看，虽然2次地震震中仅差13km，但前者震源比后者深，分析其原因，可能为2012年11月20日地震由银川断裂的主断裂控制，而2010年6月22日地震由银川断裂的南支分断裂控制。

关键词: 永宁地震, TDMT矩张量反演, Snoke方法, sPn震相

Abstract:

TwoM_S4.5 earthquakes happened in Yongning, a county of Yinchuan in Ningxia on June 22, 2010 and November 20, 2012, which were both strongly felt in Yinchuan and its vicinities. In order to understand the seismogenic structure better, we collected the regional earthquake waveform data of Ningxia and nearby seismic networks. Locating main shocks and aftershocks distribution by Hyp2000 and inversing the focal mechanism and depth by TDMT, we got results as follows: for the June 22 earthquake, nodal plane Ⅰ: strike 208, dip 89, and rake -164; nodal plane Ⅱ: strike 117, dip 74, and rake -2. For the November 20 earthquake: nodal plane Ⅰ: strike 284, dip 79, and rake 12, nodal plane II strike 192, dip 79, and rake 169. By means of reference to Snoke method, it is known that the main fractures of the two earthquakes are both strike slip faults with NNE-trending and NNW-dipping, while the former has a small amount of tension component and the latter has a small amount of thrust component. And the moment magnitudes of them areM_W4.5 andM_W4.3. According to Hyp2000 location, TDMT moment tensor fitting error and sPn depth phases, we consider that the focal depths of the two earthquakes are 22km and 8km, both are shallow-focus ones. Though the epicenters of the two earthquakes are 13km apart from each other, the former one is deeper, the reason is that the November 20 earthquake was controlled by the major fault of Yinchuan Fault, while the June 22 earthquake was controlled by south branch of Yinchuan Fault.

Key words: Yongning earthquakes, TDMT moment tensor inversion, the Snoke method, sPn phase

中图分类号:

P315.3⁺3

金春华, 何秋菊, 田小慧. 永宁2次M_S4.5地震震源机制及深度[J]. 地震地质, 2017, 39(1): 193-205.

JIN Chun-hua, HE Qiu-ju, TIAN Xiao-hui. RESEARCH OF FOCAL MECHANISM AND DEPTH OF TWOM_S4.5 EARTHQUAKES IN YONGNING[J]. SEISMOLOGY AND GEOLOGY, 2017, 39(1): 193-205.

参考文献

柴炽章. 2011. 银川市活动断层探测与地震危险性评价［M］. 北京: 科学出版社. 28-37.
CHAI Chi-zhang. 2011. Active Faults Exploration and Seismic Hazard Assessment in Yinchuan［M］. Science Press, Beijing. 28-37(in Chinese).
胡幸平, 俞春泉, 陶开, 等. 2008. 利用P波初动资料求解汶川地震及其强余震震源机制解［J］. 地球物理学报, 51(6): 1711-1718.
HU Xing-ping, YU Chun-quan, TAO Kai,et al. 2008. Focal mechanism solutions of Wenchuan earthquake and its strong aftershocks obtained from initial P wave polarity analysis［J］. Chinese Journal of Geophysics, 51(6): 1711-1718(in Chinese).
刘丽芳, 毛慧玲, 苏有锦, 等. 2009. 利用P波、 S波初动和振幅比计算2000年姚安M_S6.5地震序列震源机制解［J］. 地震研究, 32(1): 25-30.
LIU Li-fang, MAO Hui-ling, SU You-jin,et al. 2009. Determining focal mechanism solution of the 2000 Yao'anM_S6.5 earthquake sequence using the first motion and amplitude ratio of P and S wave［J］. Journal of Seismological Research, 32(1): 25-30(in Chinese).
孙茁, 吴建平, 房利华, 等. 2014. 利用sPn 震相测定芦山M_S7.0地震余震的震源深度［J］. 地球物理学报, 57(2): 430-440.
SUN Zhuo, WU Jian-ping, FANG Li-hua,et al. 2014. Focal depth determination of aftershocks of LushanM_S7.0 earthquake from sPn phase［J］. Chinese Journal of Geophysics, 57(2): 430-440(in Chinese).
王绒霞. 1984. 宁夏地区地震波走时表［M］. 兰州: 中国科学院冰川冻土研究所通利公司.
WANG Rong-xia. 1984. Seismic Traveltime Table of Ningxia Area［M］. Tongli Company, Lanzhou Institute of Glaciology and Cryopedology, Chinese Academy of Sciences, Lanzhou(in Chinese).
许力生, 陈运泰. 2004. 格林函数库技术与快速地震矩张量反演［M］//陈运泰, 滕吉文, 阚荣举, 等. 中国大陆地震学与地球内部物理学研究进展: 庆贺曾融生院士八十寿辰. 北京: 地震出版社.
XU Li-sheng, CHEN Yun-tai. 2004. Green function libraries and fast seismic moment tensor inversion［M］//CHEN Yun-tai, TENG Ji-wen, KAN Rong-ju,et al.(eds). Advances in Seismology and Physics of the Earth's Interior in China: In Honor of Academician Zeng Rongsheng's 80^th Birthday. Seismological Press, Beijing(in Chinese).
杨明芝, 马禾青, 廖玉华. 2007. 宁夏地震活动与研究［M］. 北京: 地震出版社. 11-46.
YANG Ming-zhi, MA He-qing, LIAO Yu-hua. 2007. Ningxia Seismic Activity and Research［M］. Seismological Press, Beijing. 11-46(in Chinese).
赵翠萍, 陈章立, 郑斯华, 等. 2008. 伽师震源区中等强度地震矩张量反演及其应力场特征［J］. 地球物理学报, 51(3): 782-792.
ZHAO Cui-ping, CHEN Zhang-li, ZHENG Si-hua,et al. 2008. Moment inversion of moderate earthquakes and the locally perturbed stress field in the Jiashi source region［J］. Chinese Journal of Geophysics, 51(3): 782-792(in Chinese).
Dreger D S. 2003. TDMT_INV: Time domain seismic moment tensor inversion［J］. International Geophysics, 81(Part B): 1627.
Dreger D S, Helmberger D V. 1993. Determination of source parameters at regional distances with three-component sparse network data［J］. Journal of Geophysical Research, 98(B5): 8107-8125.
Klein F W. 2002. User's guide to HYPOINVERSE-2000, a Fortran program to solve for earthquake locations and magnitudes［R］. Open-File Report 2002-171.Menlo Park, CA: US Geological Survey: 36-40.
Patton H J, Zandt G. 1991. Seismic moment tensors of western U.S. earthquakes and implications for the tectonic stress field［J］. Journal of Geophysical Research, 96(B11): 18245-18259.
Saikia C K. 1994. Modified frequency-wavenumber algorithm for regional seismograms using Filon's quadrature: Modelling of L_g waves in Eastern North America［J］. Geophysical Journal International, 118(1): 142-158.
Snoke J A. 1989. Earthquake mechanism［M］//James D E(ed). Encyclopedia of Geophysics. New York: Van Nostrand Reinhold Company: 239-245.
Snoke J A, Munsey J W, Teague A G,et al. 1984. A program for focal mechanism determination by combined use of polarity and SV-P amplitude ratio data［J］. Earthquake Notes, 55(3): 15.
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.
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.

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永宁2次M_S4.5地震震源机制及深度

RESEARCH OF FOCAL MECHANISM AND DEPTH OF TWOM_S4.5 EARTHQUAKES IN YONGNING

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RESEARCH OF FOCAL MECHANISM AND DEPTH OF TWOM_S4.5 EARTHQUAKES IN YONGNING