岫岩5.4级地震序列主应力变化特征研究
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摘要
根据1999年岫岩地震序列的活动特点,将其划分为前震、余震密集、余震平静、余震衰减4个时段,利用收集整理的1999年6月至2000年9月间该序列中161次2.5级以上地震的震源机制解和Gephart的应力反演方法,研究了震源区各时段内构造应力场的总体特征和时序变化特征。结果表明,序列的主压应力方向与华北地区的构造应力场基本一致,而且最大主压应力的空间取向经历了主震前相对稳定—主震后分散—最大余震前相对稳定—最大余震后分散的全过程。该结果对主震和最大余震的预测具有一定的参考价值。
Based on the active characteristics of 1999 Xiuyan earthquake series,it is divided into four periods,namely,foreshock,aftershock concentration,aftershock tranquilization and aftershock attenuation.We used 161 focal mechanisms of M2.5 from June of 1999 to September of 2000 and stress inversion method by Gephart to study the overall characteristics and time series variation characteristics of tectonic stress field in every period of source area.It is found that the direction of the principal compressional stress is basically consistent with the direction of tectonic stress field in North China,and the spatial orientation of the maximum principal compressional stress experienced relative stabilization before the mainshock-disperse after the main shock-relative stabilization before the maximum aftershock-disperse after the maximum aftershock.This result has a certain reference value for forecasting of main shock and the maximum aftershock.
Based on the active characteristics of 1999 Xiuyan earthquake series,it is divided into four periods,namely,foreshock,aftershock concentration,aftershock tranquilization and aftershock attenuation.We used 161 focal mechanisms of M2.5 from June of 1999 to September of 2000 and stress inversion method by Gephart to study the overall characteristics and time series variation characteristics of tectonic stress field in every period of source area.It is found that the direction of the principal compressional stress is basically consistent with the direction of tectonic stress field in North China,and the spatial orientation of the maximum principal compressional stress experienced relative stabilization before the mainshock-disperse after the main shock-relative stabilization before the maximum aftershock-disperse after the maximum aftershock.This result has a certain reference value for forecasting of main shock and the maximum aftershock.
引文
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[2]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[J].地震学报,1983,5(3):268-278.
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[4]许忠淮,戈澍谟.用滑动方向拟合法反演富蕴地震断裂带应力场[J].地震学报,1984.6(4):395-403.
[5]许忠淮.用滑动方向拟合法反演唐山余震区的平均应力场[J].地震学报,1985,7(4):349-361.
[6]Angelier J.Determination of the mean principal directions of stresses for a given fault population[J].Tectonophysics,1979,56:17-26.
[7]Angelier J.Tectonic analysis of fault slip data sets[J].Jour Geophys Res,1984,89(B7):5 835-5 848.
[8]Gephart J W,Forsyth D W.An improved method for determining the regional stress tensor usingearthquake focal mechanism data:application to the San Fernando earthquake sequence[J].J Geo-phys Res,1984,89:9 305-9 320.
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[10]Gephart J W.FMSI:A FORTRAN program for inverting fault/slickenside and earthquake focalmechanism data to obtain the regional stress tensor[J].Comput&Geosci,1990,16(7):953-989.
[11]傅征祥.1983年11月16日夏威夷Kaoiki地震(MS=6.6)前后的小震震源机制解[J].地震学报,1991,13(2):139-149.
[12]张萍,蒋秀琴.岫岩-海城MS5.4地震序列的震源机制解及应力场特征[J].地震地磁观测与研究,2001,22(2):76-82.
[13]张萍,于龙伟,李爱民,等.岫岩-海城MS5.4地震余震震源机制研究[J].东北地震研究,2003,19(2):28-35.
[14]张萍,蒋秀琴,高艳玲,等.解析计算法与吴尔夫网投影法求解震源机制结果比较[J].地震,2003,23(4):43-48.
[15]张萍,于龙伟,李涯,等.岫岩-海城5.4级地震前小震震源机制解与记录特征分析[J].地震地磁观测与研究,2003,24(1):29-37.
[16]王安东,谷光裕,黄河,等.1999年11月29日和2000年1月12日辽宁省海城-岫岩5.4级和5.1级地震[A].陈棋福,郑大林,高荣胜,等.中国震例[C].北京:地震出版社,2003.429-467.
[17]许忠淮,汪素云,黄雨蕊,等.由大量的地震资料推断的我国大陆构造应力场[J].地球物理学报,1989,32(6):636-647.
[18]魏光兴,周翠英,赵兴兰.华北地区中小地震应力场的优势方向[J].地球物理学报,1982,25(4):333-343.
[19]李钦祖,靳雅敏,于新昌.华北地区的震源机制与地壳应力场[J].地震学报,1982,4(1):56-61.
[20]顾浩鼎,陈运泰,高祥林,等.1975年2月4日辽宁省海城地震的震源机制[J].地球物理学报,1976,19(4):271-285.
[21]邓起东,王挺梅,李建国,等.关于海城地震震源模式的讨论[J].地质科学,1976,9(3):195-204.
[22]高常波,钟以章.1999年辽宁海城-岫岩5.6级地震的地质构造背景和发震构造[J].地震地质,2000,22(4):405-411.
①陆远忠等,基于GIS的地震分析预报系统使用说明书,2003年。
[2]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[J].地震学报,1983,5(3):268-278.
[3]Bott M H P.The mechanism of oblique slip faulting[J].Geological Magazine,1959,96(2):109-117.
[4]许忠淮,戈澍谟.用滑动方向拟合法反演富蕴地震断裂带应力场[J].地震学报,1984.6(4):395-403.
[5]许忠淮.用滑动方向拟合法反演唐山余震区的平均应力场[J].地震学报,1985,7(4):349-361.
[6]Angelier J.Determination of the mean principal directions of stresses for a given fault population[J].Tectonophysics,1979,56:17-26.
[7]Angelier J.Tectonic analysis of fault slip data sets[J].Jour Geophys Res,1984,89(B7):5 835-5 848.
[8]Gephart J W,Forsyth D W.An improved method for determining the regional stress tensor usingearthquake focal mechanism data:application to the San Fernando earthquake sequence[J].J Geo-phys Res,1984,89:9 305-9 320.
[9]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[J].地震学报,1999,21(5):513-522.
[10]Gephart J W.FMSI:A FORTRAN program for inverting fault/slickenside and earthquake focalmechanism data to obtain the regional stress tensor[J].Comput&Geosci,1990,16(7):953-989.
[11]傅征祥.1983年11月16日夏威夷Kaoiki地震(MS=6.6)前后的小震震源机制解[J].地震学报,1991,13(2):139-149.
[12]张萍,蒋秀琴.岫岩-海城MS5.4地震序列的震源机制解及应力场特征[J].地震地磁观测与研究,2001,22(2):76-82.
[13]张萍,于龙伟,李爱民,等.岫岩-海城MS5.4地震余震震源机制研究[J].东北地震研究,2003,19(2):28-35.
[14]张萍,蒋秀琴,高艳玲,等.解析计算法与吴尔夫网投影法求解震源机制结果比较[J].地震,2003,23(4):43-48.
[15]张萍,于龙伟,李涯,等.岫岩-海城5.4级地震前小震震源机制解与记录特征分析[J].地震地磁观测与研究,2003,24(1):29-37.
[16]王安东,谷光裕,黄河,等.1999年11月29日和2000年1月12日辽宁省海城-岫岩5.4级和5.1级地震[A].陈棋福,郑大林,高荣胜,等.中国震例[C].北京:地震出版社,2003.429-467.
[17]许忠淮,汪素云,黄雨蕊,等.由大量的地震资料推断的我国大陆构造应力场[J].地球物理学报,1989,32(6):636-647.
[18]魏光兴,周翠英,赵兴兰.华北地区中小地震应力场的优势方向[J].地球物理学报,1982,25(4):333-343.
[19]李钦祖,靳雅敏,于新昌.华北地区的震源机制与地壳应力场[J].地震学报,1982,4(1):56-61.
[20]顾浩鼎,陈运泰,高祥林,等.1975年2月4日辽宁省海城地震的震源机制[J].地球物理学报,1976,19(4):271-285.
[21]邓起东,王挺梅,李建国,等.关于海城地震震源模式的讨论[J].地质科学,1976,9(3):195-204.
[22]高常波,钟以章.1999年辽宁海城-岫岩5.6级地震的地质构造背景和发震构造[J].地震地质,2000,22(4):405-411.
①陆远忠等,基于GIS的地震分析预报系统使用说明书,2003年。
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