2009年中国大陆地区部分地震的震源机制解
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摘要
选用国家地震台网和区域台网的初至波P波初动符号资料,采用下半球等面积投影,用格点尝试法计算了2009年中国大陆27次MS4.5级以上地震的震源机制解。根据Zoback[1]研究全球应力场时的分类标准,对断层面解类型进行了分类。结果表明:走滑型(SS)地震13次,逆断层为主兼走滑(TS)8次,逆断层(TF)2次,正断层为主兼走滑(NS)3次,正断层(NF)1次。主压应力轴P轴方位的优势分布具有明显的区域特征,除东北地区有稍微的偏移,其余地区都与当地的背景构造应力场基本一致。
In this paper, the focal mechanism solutions of some earthquakes of MS≥4.5 occurring in the Chinese mainland in 2009 are determined with the lower hemisphere equal-area projection and first motion direction data of Pn and Pg waves recorded by the regional and distant seismic stations. In the calculation, the grid point test method is employed. The types of the focal fault plane are classified according to the classificatory criteria proposed by Zoback (1992) through the study of the global stress field. The results show that focal mechanism solutions of 13 earthquakes show strike-slip (SS) faulting, 8 are predominately thrust-faulting with strike-slip component (TS), 2 thrust faulting (TF), 3 predominately normal faulting with strike-slip component (NS), and only 1 normal faulting (NF). The predominant orientation of principal compressive stress P axis is different for different regions, and coincident with the local tectonic stress field, but the predominant orientation of P axis in the northeast of China deflected from the local tectonic stress field.
In this paper, the focal mechanism solutions of some earthquakes of MS≥4.5 occurring in the Chinese mainland in 2009 are determined with the lower hemisphere equal-area projection and first motion direction data of Pn and Pg waves recorded by the regional and distant seismic stations. In the calculation, the grid point test method is employed. The types of the focal fault plane are classified according to the classificatory criteria proposed by Zoback (1992) through the study of the global stress field. The results show that focal mechanism solutions of 13 earthquakes show strike-slip (SS) faulting, 8 are predominately thrust-faulting with strike-slip component (TS), 2 thrust faulting (TF), 3 predominately normal faulting with strike-slip component (NS), and only 1 normal faulting (NF). The predominant orientation of principal compressive stress P axis is different for different regions, and coincident with the local tectonic stress field, but the predominant orientation of P axis in the northeast of China deflected from the local tectonic stress field.
引文
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[2]王曰风,刁桂苓,张秀萍,等.2001年云南永胜6.0级地震余震序列震源机制解与震源应力场分析.地震研究,2008,31(2):119-122
[3]许向彤,许忠淮,张东宁,等.求震源机制解P波初动解的格点尝试概率法.地震地磁观测与研究,1995,16(4):34-42
[4]许忠淮,汪素云,高阿甲,等.我国部分早期震源机制解的重新测定.地震地磁观测与研究,1994,15(5):1-9
[5]程万正,阮祥,张永久.川滇次极地块震源机制解类型与一致性参数.地震学报,2006,28(6):561-573
[6]胡幸平,俞春泉,陶开,等.利用P波初动资料求解汶川地震及其余震震源机制解.地球物理学报,2008,51(6):1711-1718
[7]焦青,杨选辉,许丽卿,等.汶川8.0级地震前后龙门山断裂活动特征浅析.大地测量与地球动力学,2008,28(4):7-11
[8]刘超,张勇,许力生,等.一种矩张量反演新方法及其对2008年汶川MS8.0地震序列的应用.地震学报,2008,30(4):329-339
[9]龙海英,聂晓红,高国英.新疆天山地区与川滇地区中强地震震源机制解对比分析.地震研究,2007,30(3):229-234
[10]屠泓为,都昌庭,马震,等.利用P波初动计算青海中强地震的震源机制解.高原地震,2008,20(1):22-26
[11]许力生,蒋长胜,陈运泰,等.2004年首都圈地区中小地震的矩张量反演.地震学报,2007,29(3):229-239
[12]许忠淮.地震参数—数字地震学在地震预测中的应用.中国地震局监测预报司.北京:地震出版社,2003:16-25
[13]杨中书,李超.利用P波初动及振幅比初步计算2005年11月26日九江—瑞昌地震余震序列震源机制.华南地震,2006,26(3):77-82
[14]周翠英,华爱军,蒋海昆,等.以格点尝试法求取山东地区现代中小地震震源机制解.东北地震研究,2003,19(1):1-11
[15]张萍,谷光裕,高艳玲.岫岩-海城MS5.4级地震序列震源机制解.地震,2001,21(1):98-102
[16]张萍,蒋秀琴.岫岩-海城MS5.4级地震序列的震源机制解及应力场特征.地震地磁观测与研究,2001,22(2):76-82
[17]张萍,于龙伟,李涯,等.岫岩-海城MS5.4级地震前小震震源机制解与记录特征分析.地震地磁观测与研究,2003,24(1):29-38.
[18]周云好,许力生,陈运泰.2000年6月4日印度尼西亚苏门答腊南部MS8.0地震的震源机制.地震学报,2002,24(5):462-469
[19]Banghar A R.Focal mechanism of Indian earthquakes.Bull.Seismol.Soc.Amer.,1972,62(2):603-608
[20]Crosson R S,Eedo E T.Focal mechanisms of earthquakes related to the29November1975Kalapana,Hawaii,earthquake:The effect of structure models.Bull.Seismol.Soc.Amer.,1981,71(3):713-729
[21]Wu Yih-Min,Zhao Li,Chang Chien-Hsin,et al.Focal-mechanism determination in Taiwan by genetic algo-rithm.Bull.Seismol.Soc.Amer.,2008,98(2):651-661
[22]Kasahara K.Computer program for a fault-plane solution.Bull.Seismol.Soc.Amer.,1963,53(1):1-13
[23]Brillinger D R,Udias A,Bolt B A.Aprobability model for regional focal mechanism solutions.Bull.Seismol.Soc.Amer.,1980,70(1):149-170
[24]Udias A,Buforn E.Single and joint fault-plane solutions from first-motion data.In:Doornbos D J ed.Seismo-logical Algorithms.Academic Press,London,1988:443-453
[25]许忠淮,阎明,赵仲和.由多个小地震推断的华北地区构造应力场的方向.地震学报,1983,5(3):268-279
[26]Reasenberg P,Oppenheimer D.FPFIT,FPPLOT,and FPPAGE:FORTRAN computer programs for calculat-ing and displaying earthquake fault-plane solutions.U.S.Geo1.Surv.Open-File Rept,85-739,109
[27]Hardebeek J L,Shearer P M.A new method for determining first-motion focal mechanisms.Bull.Seismol.Soc.Amer.,2002,92(6):2264-2276
[28]俞春泉,陶开,崔效锋,等.用格点尝试法求解P波初动震源机制解及解的质量评价.地球物理学报,2009,52(5):1402-1411
[29]郭祥云,陈学忠,李艳娥.2008年5月12日四川汶川8.0级地震与部分余震的震源机制解.地震,2010,30(1):50-60
[30]谢富仁,崔效锋,赵建涛.全球应力场与构造分析.地学前缘,2003,10(8):22-30
[31]徐纪人,赵志新.青藏高原及其周围地区区域应力场与构造运动特征.中国地质,2006,33(2):275-285
[2]王曰风,刁桂苓,张秀萍,等.2001年云南永胜6.0级地震余震序列震源机制解与震源应力场分析.地震研究,2008,31(2):119-122
[3]许向彤,许忠淮,张东宁,等.求震源机制解P波初动解的格点尝试概率法.地震地磁观测与研究,1995,16(4):34-42
[4]许忠淮,汪素云,高阿甲,等.我国部分早期震源机制解的重新测定.地震地磁观测与研究,1994,15(5):1-9
[5]程万正,阮祥,张永久.川滇次极地块震源机制解类型与一致性参数.地震学报,2006,28(6):561-573
[6]胡幸平,俞春泉,陶开,等.利用P波初动资料求解汶川地震及其余震震源机制解.地球物理学报,2008,51(6):1711-1718
[7]焦青,杨选辉,许丽卿,等.汶川8.0级地震前后龙门山断裂活动特征浅析.大地测量与地球动力学,2008,28(4):7-11
[8]刘超,张勇,许力生,等.一种矩张量反演新方法及其对2008年汶川MS8.0地震序列的应用.地震学报,2008,30(4):329-339
[9]龙海英,聂晓红,高国英.新疆天山地区与川滇地区中强地震震源机制解对比分析.地震研究,2007,30(3):229-234
[10]屠泓为,都昌庭,马震,等.利用P波初动计算青海中强地震的震源机制解.高原地震,2008,20(1):22-26
[11]许力生,蒋长胜,陈运泰,等.2004年首都圈地区中小地震的矩张量反演.地震学报,2007,29(3):229-239
[12]许忠淮.地震参数—数字地震学在地震预测中的应用.中国地震局监测预报司.北京:地震出版社,2003:16-25
[13]杨中书,李超.利用P波初动及振幅比初步计算2005年11月26日九江—瑞昌地震余震序列震源机制.华南地震,2006,26(3):77-82
[14]周翠英,华爱军,蒋海昆,等.以格点尝试法求取山东地区现代中小地震震源机制解.东北地震研究,2003,19(1):1-11
[15]张萍,谷光裕,高艳玲.岫岩-海城MS5.4级地震序列震源机制解.地震,2001,21(1):98-102
[16]张萍,蒋秀琴.岫岩-海城MS5.4级地震序列的震源机制解及应力场特征.地震地磁观测与研究,2001,22(2):76-82
[17]张萍,于龙伟,李涯,等.岫岩-海城MS5.4级地震前小震震源机制解与记录特征分析.地震地磁观测与研究,2003,24(1):29-38.
[18]周云好,许力生,陈运泰.2000年6月4日印度尼西亚苏门答腊南部MS8.0地震的震源机制.地震学报,2002,24(5):462-469
[19]Banghar A R.Focal mechanism of Indian earthquakes.Bull.Seismol.Soc.Amer.,1972,62(2):603-608
[20]Crosson R S,Eedo E T.Focal mechanisms of earthquakes related to the29November1975Kalapana,Hawaii,earthquake:The effect of structure models.Bull.Seismol.Soc.Amer.,1981,71(3):713-729
[21]Wu Yih-Min,Zhao Li,Chang Chien-Hsin,et al.Focal-mechanism determination in Taiwan by genetic algo-rithm.Bull.Seismol.Soc.Amer.,2008,98(2):651-661
[22]Kasahara K.Computer program for a fault-plane solution.Bull.Seismol.Soc.Amer.,1963,53(1):1-13
[23]Brillinger D R,Udias A,Bolt B A.Aprobability model for regional focal mechanism solutions.Bull.Seismol.Soc.Amer.,1980,70(1):149-170
[24]Udias A,Buforn E.Single and joint fault-plane solutions from first-motion data.In:Doornbos D J ed.Seismo-logical Algorithms.Academic Press,London,1988:443-453
[25]许忠淮,阎明,赵仲和.由多个小地震推断的华北地区构造应力场的方向.地震学报,1983,5(3):268-279
[26]Reasenberg P,Oppenheimer D.FPFIT,FPPLOT,and FPPAGE:FORTRAN computer programs for calculat-ing and displaying earthquake fault-plane solutions.U.S.Geo1.Surv.Open-File Rept,85-739,109
[27]Hardebeek J L,Shearer P M.A new method for determining first-motion focal mechanisms.Bull.Seismol.Soc.Amer.,2002,92(6):2264-2276
[28]俞春泉,陶开,崔效锋,等.用格点尝试法求解P波初动震源机制解及解的质量评价.地球物理学报,2009,52(5):1402-1411
[29]郭祥云,陈学忠,李艳娥.2008年5月12日四川汶川8.0级地震与部分余震的震源机制解.地震,2010,30(1):50-60
[30]谢富仁,崔效锋,赵建涛.全球应力场与构造分析.地学前缘,2003,10(8):22-30
[31]徐纪人,赵志新.青藏高原及其周围地区区域应力场与构造运动特征.中国地质,2006,33(2):275-285
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