2012年9月7日云南彝良M_s5.7、M_s5.6地震震源破裂特征与发震构造研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
基于中国国家和区域数字地震台网记录,采用CAP方法反演了2012年9月7日云南彝良5.7、5.6级地震的震源机制解和震源深度,并利用IRIS提供的远震记录深度震相(P、PP、SP)进一步确定了震源深度,最后结合地震序列分布、地震烈度分布和区域地质背景讨论了发震构造.结果显示彝良5.7级地震的震源机制解为节面I走向243°、倾角62°、滑动角149°,节面Ⅱ走向349°、倾角63°、滑动角32°;5.6级地震的震源机制解为节面I走向241°、倾角37°、滑动角162°,节面Ⅱ走向346°、倾角79°、滑动角54°,这两次地震的发震构造均为NE走向的石门断裂,震源矩心深度均为6km左右,表明地震的能量释放主要发生在地壳浅部,这也是导致震区严重灾害的一个重要原因.
Based on the records of CSN and regional digital seismic networks,we obtained the focal depth and focal mechanism of the Ms5.7 and Ms5.6 Yiliang earthquakes of Sep.7,2012 with the "Cut and Paste"(CAP) method,and used the teleseismic depth phases like P,PP,and SP from IRIS records to determine the focal depth.Further,we analyzed the rupture characteristics and seismogenic structures of the Yiliang earthquakes combining with the earthquake epicenters,seismic intensity,and geologic settings in the region.Our result shows that the best double couple solution of the Ms5.7 event is 243°,62°,and 149° for strike,dip,and rake angles respectively,the other nodal plane is 349°,63°,and 32°;for the Ms5.6 event the solution is 241°,37°,162° with the other nodal plane of 346°,79°and 54°.We infer that both of the Ms5.7 and Ms5.6 earthquakes occurred on the NE striking Shimen fault and the focal depths of the events are about 6 km,the released seismic energy was concentrated in shallower crust which is an important reason for the serious seismic damage in the region.
引文
[1]China Earthquake Administration(中国地震局).http://www.cea.gov.cn/publish/dizhenj/124/202/203/20121128102618031713930/index.html[2012-09-11].
    [2]Huangpu Gang(皇甫岗).http://www.cea.gov.cn/manage/html/8a8587881632fa5c0116674a018300cf/_content/12_09/07/1347017506528.html,[2012-09-07].
    [3]Han Libo,Jiang Changsheng(韩立波,蒋长胜).http://www.cea-igp.ac.cn/upload/Image/mrtp/1_2635775029.jpg,[2012-09-08].
    [4]China Earthquake Networks Center(中国地震台网中心).http://www.cea.gov.cn/manage/html/8a8587881632fa5c0116674a018300cf/_content/12_09/07/1347009495687.html[2012-09-07].
    [5]Xu Xiwei Yu Guihua(徐锡伟,于贵华).http://www.eq-igl.ac.cn/wwwroot/c_000000090002/d_0730.html[2012-09-08].
    [6]GlobalCMT.http://www.globalcmt.org/CMTsearch.html[2012-09-07].
    [7]Zhao L S,Helmberger D V.Source estimation frombroadband regional seismograms.Bull.Seismol.Soc.Amer.,1994,84(1):91-104.
    [8]Zhu L P,Helmberger D V.Advancement in sourceestimation techniques using broadband regional seismograms.Bull.Seismol.Soc.Amer.,1996,86(5):1634-1641.
    [9]Tan Y,Zhu L P,Helmberger D V,et al.Locating andmodeling regional earthquakes with two stations.J.Geophys.Res.,2006,111,B01306,doi:1029/2005JB003775.
    [10]韦生吉,倪四道,崇加军等.2003年8月16日赤峰地震:一个可能发生在下地壳的地震.地球物理学报,2009,52(1):111-119.Wei S J,Ni S D,Chong J J,et a1.The 16 August 2003Chifeng earthquake:Is it a lower crust earthquake.ChineseJournal of Geophysics(in Chinese),2009,52(1):111-119.
    [11]黄建平,倪四道,傅容珊等.综合近震及远震波形反演2006文安地震(Mw5.1)的震源机制解.地球物理学报,2009,52(1):120-130.Huang J P,Ni S D,Fu R S,et a1.Source mechanism of the2006 Mw5.1 Wen′an Earthquake determined from a jointinversion of local and teleseismic broadband waveform data.Chinese Journal of Geophysics(in Chinese),2009,52(1):120-130.
    [12]郑勇,马宏生,吕坚等.汶川地震强余震(Ms≥5.6)的震源机制解及其与发震构造的关系.中国科学(D辑),2009,39(4):413-426.Zheng Y,Ma H S,LüJ,et al.Source mechanism of strongaftershock of(Ms≥5.6)of Wenchuan earthquake and theimplication for Seismol motectonic.Science in China(Seri.D)(in Chinese),2009,39(4):413-426.
    [13]谢祖军,郑勇,倪四道等.2011年1月19日安庆ML4.8地震的震源机制解和深度研究.地球物理学报,2012,55(5):1624-1634.Xie Z J,Zheng Y,Ni S D,et al.Focal mechanism and focaldepth of the 19January 2011 Anqing earthquake.ChineseJournal of Geophysics(in Chinese),2012,55(5):1624-1634.
    [14]吕坚,郑勇,倪四道等.2005年11月26日九江—瑞昌Ms5.7、Ms4.8地震的震源机制解与发震构造研究.地球物理学报,2008,51(1):158-164.LüJ,Zheng Y,Ni S D,et al.Focal mechanisms and seismo-logenic structures of the Ms5.7and Ms4.8Jiujiang-Ruichangearthquake of Nov.26,2005.Chinese Journal ofGeophysics(in Chinese),2008,51(1):158-164.
    [15]郑秀芬,欧阳飚,张东宁等.“国家数字测震台网数据备份中心”技术系统建设及其对汶川大地震研究的数据支撑.地球物理学报,2009,52(5):1412-1417.Zheng X F,Ouyang B,Zhang D N,et al.Technical systemconstruction of Data Backup Centre for China Seismolmograph Network and the data support to researches on theWenchuan earthquake.Chinese Journal of Geophysics(inChinese),2009,52(5):1412-1417.
    [16]朱介寿,蔡学林,曹家敏等.中国华南及东海地区岩石圈三维结构及演化.北京:地质出版社,2005:50-51.Zhu J S,Cai X L,Cao J M,et al.The Three-DimensionalStructure of Lithosphere and Its Evolution in South China andEase China Sea.Beijing:Geological Publishing House(inChinese),2005:50-51.
    [17]Engdahl E R,van der Hilst R,Buland R.Global teleseismicearthquake relocation with improved travel times andprocedures for depth determination.Bull.Seismol.Soc.Amer.,1998,88(3):722-743.
    [18]Luo Y,Ni S D,Zeng X F,et al.The M5.0Suining-Tongnan(China)earthquake of 31 January 2010:A destructiveearthquake occurring in sedimentary cover.Chinese Sci.Bull.,2011,56(6):521-525.
    [19]Wang Z J,Chong J J,Ni S D,et al.Determination of focaldepth by two waveform based methods:A case study for the2008Panzhihua earthquake.Earthq.Sci.,2011,24(4):321-328.
    [20]Kikuchi M,Kanamori H.Inversion of complex body waves.Bull.Seismol.Soc.Amer.,1982,72(2):491-506.
    [21]陈伟文,倪四道,汪贞杰等.2010年高雄地震震源参数的近远震波形联合反演.地球物理学报,2012,55(7):2319-2328.Chen W W,Ni S D,Wang Z J,et al.Joint inversion withboth local and teleseismic waveforms for source parameters ofthe 2010 Kaohsiung earthquake.Chinese Journal ofGeophysics(in Chinese),2012,55(7):2319-2328.
    [22]闻学泽,杜方,龙锋等.小江和曲江—石屏两断裂系统的构造动力学与强震序列的关联性.中国科学(D辑),2011,41(5):713-724Wen X Z,Du F,Long F,et al.Tectonic dynamics andcorrelation of major earthquake sequences of the Xiaojiangand Qujiang—Shiping fault systems,Yunnan,China.Sciencein China(Seri.D)(in Chinese),2011,54(10):1563-1575.
    [23]Okada Y.Internal deformation due to shear and tensile faultsin a half-space.Bull.Seismol.Soc.Amer.,1992,82(2):1018-1040.
    [24]Shan B,Xiong X,Zheng Y,et al.The co-seismic Coulombstress change and expected seismicity rate caused by 14April2010 Ms=7.1Yushu,China,earthquake.Tectonophysics,2011,510(3-4):345-353.
    [25]Shan B,Xiong X,Zheng Y,et al.Stress changes on majorfaults caused by Mw7.9 Wenchuan earthquake,May 12,2008.Sci.China Earth Sci.,2009,52(5):593-601.
    [26]King G C P,Stein R S,Lin J.Static stress changes and thetriggering of earthquakes.Bull.Seismol.Soc.Amer.,1994,84(3):935-953.
    [27]Wells D L,Coppersmith K J.New empirical relationshipsamong magnitude,rupture length,rupture width,rupturearea,and surface displacement.Bull.Seismol.Soc.Amer.,1994,84(4):974-1002.
    [28]苏有锦,李永莉,李忠华等.川滇地区区域地震目录完整性最小震级分析.地震研究,2003,26(增刊):10-16.Su Y J,Li Y L,Li Z H,et al.Analysis of minimumcomplete magnitude of earthquake catalog in Sichuan-Yunnanregion.Journal of Seismological Research(in Chinese),2003,26(Suppl.):10-16.
    [29]秦嘉政,皇甫岗,钱晓东.云南强震活动与预测方法研究.昆明:云南科技出版社,2005:6-40.Qin J Z,Huangfu G,Qian X D.Strong Earthquakes andPrediction Method Research in Yunan.Kunming:YunanTechnology Publishing House(in Chinese),2005:6-40.
    [30]许忠淮.东亚地区现今构造应力图的编制.地震学报,2001,23(5):492-501.Xu Z H.A present-day tectonic stress map for Eastern Asiaregion.Acta Seismologica Sinica(in Chinese),2001,23(5):492-501.
    [31]谢富仁,崔效锋,赵建涛等.中国大陆及邻区现代构造应力场分区.地球物理学报,2004,47(4):654-662.Xie F R,Cui X F,Zhao J T,et al.Regional division of therecent tectonic stress field in China and adjacent areas.Chinese Journal of Geophysics(in Chinese),2004,47(4):654-662.
    [32]崔效锋,谢富仁.利用震源机制解对中国西南及邻区进行应力分区的初步研究.地震学报,1999,21(5):513-522.Cui X F,Xie F R.Preliminary research to determine stressdistricts from focal mechanism solutions in southwest Chinaand its adjacent area.Acta Seismologica Sinica(in Chinese),1999,12(5):513-522.
    [33]Wan Y G.Contemporary tectonic stress field in China.Earthq.Sci.,2010,23(4):377-386.
    [34]张培震,邓起东,张国民等.中国大陆的强震活动与活动地块.中国科学(D辑),2003,33(增刊):5-11.Zhang P Z,Deng Q D,Zhang G M,et al.Active blocks andstrong earthquakes in mainland China.Science in China(Seri.D)(in Chinese),2003,33(Suppl.):5-11.
    [35]张国民,马宏生,王辉等.中国大陆活动地块与强震活动关系.中国科学(D辑),2004,34(7):591-599.Zhang G M,Ma H S,Wang H,et al.The relation betweenactive blocks and strong earthquakes in China.Science inChina(Seri.D)(in Chinese),2004,34(7):591-599.
    [36]邓起东,张培震,冉勇康等.中国活动构造基本特征.中国科学(D辑),2002,32(12):1020-1030.Deng Q D,Zhang P Z,Ran Y K,et al.Basic feature ofChina active structures.Science in China(Seri.D)(inChinese),2002,32(12):1020-1030.
    [37]王琪,张培震,牛之俊等.中国大陆现今地壳运动和构造变形.中国科学(D辑),2001,31(7):529-536.Wang Q,Zhang P Z,Niu Z J,et al.Present-day crustalmovement and tectonic deformation in Chinese mainland.Science in China(Seri.D)(in Chinese),2001,31(7):529-536.
    [38]程佳,徐锡伟,甘卫军等.青藏高原东南缘地震活动与地壳运动所反映的块体特征及其动力来源.地球物理学报,2012,55(4):1198-1212.Cheng J,Xu X W,Gan W J,et al.Block model and dynamicimplication from the earthquake activities and crustal motionin the southeastern margin of Tibetan Plateau.ChineseJournal of Geophysics(in Chinese),2012,55(4):1198-1212.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心