2011年9月10日瑞昌-阳新地震发震构造初探
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摘要
基于密集流动台阵,联合使用主事件法和sPL深度震相,对2011年9月10日瑞昌一阳新M_S4.6地震及其余震序列进行重新定位,获得更为准确的震源位置。结果显示:重新定位后主震的水平位置为29.70°N,115.47°E,误差约1km;震源深度为15km,误差约2km。结合地震序列定位结果、主震震源机制解和震区NE向断层发育的构造背景,初步探讨主震可能的发震构造。
Based on the records of the temporary seismic array and combined master event technique and the sPL phase,we relocate the Ruichang-Yangxin earthquake sequences which occurred in Jiangxi province on 10 September,2011.The relocation results indicate that the epicenter of the main shock is relocated to be 29.70°N,115.47°E,whose error is about 1 kin,the focal depth is about 15 km,whose error is about 2kin.Combining the location of the earthquake sequence,the focal mechanism of the main shock and the tectonic condition of NE faults growth in seismic region,we preliminarily discuss probable seismogenic structure of the main shock.
Based on the records of the temporary seismic array and combined master event technique and the sPL phase,we relocate the Ruichang-Yangxin earthquake sequences which occurred in Jiangxi province on 10 September,2011.The relocation results indicate that the epicenter of the main shock is relocated to be 29.70°N,115.47°E,whose error is about 1 kin,the focal depth is about 15 km,whose error is about 2kin.Combining the location of the earthquake sequence,the focal mechanism of the main shock and the tectonic condition of NE faults growth in seismic region,we preliminarily discuss probable seismogenic structure of the main shock.
引文
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崇加军,倪四道,曾祥方.sPL,一个近距离确定震源深度的震相[J].地球物理学报,2010,53(11):2620-2630.
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王晓青,丁香,王龙,等.四川汶川8级大地震灾害损失快速评估研究[J].地震学报,2009,31(2):205-211.
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郑勇,马宏生,吕坚,等.汶川地震强余震(M_s≥5.6)的震源机制解及其与发震构造的关系[J].中国科学D辑,2009,39(4):413-426.
周仕勇,许忠淮,韩京,等.主地震定位法分析以及1997年新疆伽师群震高精度定位[J].地震学报,1997,21(3):258-265.
Billings S D.Simulated annealing for earthquake location[J].Geophys J Int,1994,118:680-692.
Klein F W.User's Guide to HYPOINVERSE-2000,a Fortran Program to Solve for Earthquake Locations and Magnitudes[R].U S Geological Survey Open-File Report,2002,02-171:1-123.
Li Z W,Ni S D,Hao T Y,et al.Uppermost mantle structure of the eastern margin of the Tibetan plateau from interstation Pn traveltime difference tomography[J].Earth and Planetary Science Letters,2012,335-336:195-205.
Li Z W,Xu Y,Huang R Q,et al.Crustal P-wave velocity structure of the Longmen Shan region and its tectonic implications for the 2008Wenchuan earthquake[J].Sci China Earth Sci,2011,54(9):1386-1393.
Lomnitz C.Three Theorems of Earthquake Location[J].Bull Seism Soc Am,2006,96(1)..306-312.
Mori J.Estimates of velocity structure and source depth using multiple P waves from aftershock of the 1987Elmore Ranch and Superstition Hills,California,earthquakes[J].Bull Seism Soc Am,1991,81(2):508-523.
Nelson G,Vidale J.Earthquake locations by 3-D finite-difference travel times[J].Bull Seis Soc Am,1990,80(2):395-410.
Thurber C.Nonlinear earthquake location:theory and examples[J].Bull Seis Soc Am,1985,75(3):779-790.
Wang Z J,Chong J J,Ni S D,et al.Determination of focal depth by two waveform-based methods:A case study for the 2008Panzhihua earthquake[J].Earthquake Science,2011,24(4):321-32.
Xie J,Zeng X,Chen W,et al.Comparison of ground truth location of earthquake from IaSAR and from ambient seismic noise:A case study of the 1998Zhangbei earthquake[J].Earthquake Science,2011,24(2):239-247.
Zhan Z,Jin B K,Wei S J,et al.Coulomb stress change sensitivity due to variability in mainshock source models and receiving fault parameters:A case study of the 2010-2011.Christchurch New Zealand earthquakes[J].Seismological Research Letters,2011,82(6):800-814.
Zhan Z,Wei S,Ni S,et al.Earthquake centroid locations using calibration from ambient seismic noise[J].Bull Seism Soc Am,2011,101(3):1438-1445.
Zhu L P,Rivers L A.A note on the dynamic and static displacements from a point source in multi-layered media[J].Geophys J Int,2002,148(3):619-627.
崇加军,倪四道,曾祥方.sPL,一个近距离确定震源深度的震相[J].地球物理学报,2010,53(11):2620-2630.
房立华,吴建平,张天中,等.2011年云南盈江Ms 5.8地震及其余震序列重定位[J].地震学报,2011,,33(2):62-267.
高原,周蕙兰,郑斯华,等.测定震源深度的意义的初步讨论[J].中国地震,1997,13(4):321-329.
黄金莉,赵大鹏.首都圈地区地壳三维P波速度细结构与强震孕育的深部构造环境[J].科学通报,2005,50(4):348-355.
嘉世旭,齐诚,王夫运,等.首都圈地壳网格化三维结构[J].地球物理学报,2005,48(6):1316-1324.
吕坚,曾文敬,谢祖军,等.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探讨[J].地球物理学报,2012,55(11):3625-3633.
吕坚,郑勇,倪四道,等.2005年11月26日九江—瑞昌Ms 5.7、Ms 4.8地震的震源机制解与发震构造研究[J].地球物理学报,2008,51(1):158-164.
罗艳,倪四道,曾祥方,等.汶川地震余震区东北端一个余震序列的地震学研究[J].中国科学D辑,2010b,40(6):677-687.
石耀霖,朱守彪.中国大陆震源机制深度变化反映的地壳—地幔流变特征[J].地球物理学报,2000,46(3):359-365.
王晓青,丁香,王龙,等.四川汶川8级大地震灾害损失快速评估研究[J].地震学报,2009,31(2):205-211.
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[J].地球物理学报,2009,52(1):111-119.
谢祖军,郑勇,倪四道,等.2011年1月19日安庆M_L 4.8地震的震源机制解和深度研究[J].地球物理学报,2012,55(5):1624.-1634.
杨智娴,陈运泰,郑月军.双差地震定位法在我国中西部地区地震精确定位中的应用[J].中国科学,2003,33(增刊):129-134.
张晁军,侯燕燕,胡彬,等.新西兰2010年M 7.1地震与2011年M 6.3地震活动和灾害分析[J].国际地震动态,2011,4:44-51.
张国民,汪素云,李丽,等.中国大陆地震震源深度及其构造含义[J].科学通报,2002,47(9):663-668.
赵珠,丁志峰,易桂喜,等.西藏地震定位:一种使用单纯形优化的非线性方法[J].地震学报,1994,16(2):212-219.
郑勇,马宏生,吕坚,等.汶川地震强余震(M_s≥5.6)的震源机制解及其与发震构造的关系[J].中国科学D辑,2009,39(4):413-426.
周仕勇,许忠淮,韩京,等.主地震定位法分析以及1997年新疆伽师群震高精度定位[J].地震学报,1997,21(3):258-265.
Billings S D.Simulated annealing for earthquake location[J].Geophys J Int,1994,118:680-692.
Klein F W.User's Guide to HYPOINVERSE-2000,a Fortran Program to Solve for Earthquake Locations and Magnitudes[R].U S Geological Survey Open-File Report,2002,02-171:1-123.
Li Z W,Ni S D,Hao T Y,et al.Uppermost mantle structure of the eastern margin of the Tibetan plateau from interstation Pn traveltime difference tomography[J].Earth and Planetary Science Letters,2012,335-336:195-205.
Li Z W,Xu Y,Huang R Q,et al.Crustal P-wave velocity structure of the Longmen Shan region and its tectonic implications for the 2008Wenchuan earthquake[J].Sci China Earth Sci,2011,54(9):1386-1393.
Lomnitz C.Three Theorems of Earthquake Location[J].Bull Seism Soc Am,2006,96(1)..306-312.
Mori J.Estimates of velocity structure and source depth using multiple P waves from aftershock of the 1987Elmore Ranch and Superstition Hills,California,earthquakes[J].Bull Seism Soc Am,1991,81(2):508-523.
Nelson G,Vidale J.Earthquake locations by 3-D finite-difference travel times[J].Bull Seis Soc Am,1990,80(2):395-410.
Thurber C.Nonlinear earthquake location:theory and examples[J].Bull Seis Soc Am,1985,75(3):779-790.
Wang Z J,Chong J J,Ni S D,et al.Determination of focal depth by two waveform-based methods:A case study for the 2008Panzhihua earthquake[J].Earthquake Science,2011,24(4):321-32.
Xie J,Zeng X,Chen W,et al.Comparison of ground truth location of earthquake from IaSAR and from ambient seismic noise:A case study of the 1998Zhangbei earthquake[J].Earthquake Science,2011,24(2):239-247.
Zhan Z,Jin B K,Wei S J,et al.Coulomb stress change sensitivity due to variability in mainshock source models and receiving fault parameters:A case study of the 2010-2011.Christchurch New Zealand earthquakes[J].Seismological Research Letters,2011,82(6):800-814.
Zhan Z,Wei S,Ni S,et al.Earthquake centroid locations using calibration from ambient seismic noise[J].Bull Seism Soc Am,2011,101(3):1438-1445.
Zhu L P,Rivers L A.A note on the dynamic and static displacements from a point source in multi-layered media[J].Geophys J Int,2002,148(3):619-627.
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