利用小震与强震震源机制解反演首都圈现今构造应力场
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摘要
由于首都圈地区近年来布设了较为密集的地震台网,使得较小地震震源机制的求解成为可能。本文收集了首都圈地区近50年来大震震源机制以及2002—2004年中小震震源机制解,采用对不同震级地震进行加权处理的网格搜索法将强震与小震结合对首都圈地区的现今地壳应力场进行反演。得到了较为精确的首都圈地区各区域的构造应力场。结果表明:北京张家口区,主压应力轴N(43°~86°)E向;唐山及邻区,主压应力轴N(38°~86°)E向;邢台区,主压应力轴N(79°~81°)E向;本文反演结果与前人结果相似,表明了研究方法的正确性,并揭示了现今首都圈地区应力场的整体一致性和分区差异,对解释首都圈地区的发震背景和地球动力学研究有一定的参考意义。
The capital region of China emplaces dense seismic network in recent years,it is possible to solve small focal mechanisms.We gathered large earthquake focal mechanisms in last fifty years and moderate or small earthquake focal mechanisms between 2002and2004,and calculated the present tectonic stress field of the capital region by the grid search method,which weighs different sized earthquakes and can improve the accuracy of the stress field inversion.The analysis of inversion results of different sub-region show that the direction of the maximum principle compressive stress axe is toward N(43°~86°)E in the Beijing—Zhangjiakou—Datong region,toward N(38°~86°)E in Tangshan area,and toward N(79°~81°)E in Xingtai area.Inversion results of this paper are similar with previous results,and reflect the correctness of the approach.The results reveal the stress field distribution consistency and sub-region difference in the capital region,and can provide reference for earthquake mechanism explanation and geodynamics research.
The capital region of China emplaces dense seismic network in recent years,it is possible to solve small focal mechanisms.We gathered large earthquake focal mechanisms in last fifty years and moderate or small earthquake focal mechanisms between 2002and2004,and calculated the present tectonic stress field of the capital region by the grid search method,which weighs different sized earthquakes and can improve the accuracy of the stress field inversion.The analysis of inversion results of different sub-region show that the direction of the maximum principle compressive stress axe is toward N(43°~86°)E in the Beijing—Zhangjiakou—Datong region,toward N(38°~86°)E in Tangshan area,and toward N(79°~81°)E in Xingtai area.Inversion results of this paper are similar with previous results,and reflect the correctness of the approach.The results reveal the stress field distribution consistency and sub-region difference in the capital region,and can provide reference for earthquake mechanism explanation and geodynamics research.
引文
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[2]李钦祖,王泽皋,贾云年,等.由单台小地震资料所得两个区域的应力场[J].地球物理学报,1973,16(1):49-61.
[3]许忠淮,汪素云,黄雨蕊,等.由大量地震的资料推断我国大陆构造应力场[J].地球物理学报,1989,32(6):636-647.
[4]许忠淮.东亚地区现今构造应力图的编制[J].地震学报,2001,23(5):492-501.
[5]谢富仁,陈群策,崔效锋,等.中国大陆地壳应力环境研究[M].北京:地质出版社,2003.
[6]Wan Y G.Contemporary tectonic stress field in China[J].Earthq Sci,2010,23:377-386.
[7]徐锡伟,吴卫民,张先康,等.首都圈地区地壳最新构造变动与地震[M].北京:科学出版社,2002.
[8]沈正康,万永革,甘卫军,等.华北地区700年来地壳应力场演化与地震的关系研究[J].中国地震,2004,20(3):211-228.
[9]李钦祖.华北地壳应力场的基本特征[J].地球物理学报,1980,23(4):376-387.
[10]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):55-61.
[11]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):268-279.
[12]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):349-362.
[13]赖院根,刘启元,陈九辉,等.首都圈地区横波分裂与地壳应力场特征[J].地球物理学报,2006,49(1):189-196.
[14]李轶群,王健.唐山余震区中小地震震源机制解分区特征的初步研究[J].中国地震,2008,24(2):150-158.
[15]高原,吴晶.利用剪切波各向异性推断地壳主压应力场:以首都圈地区为例[J].科学通报,2008,53(23):2 933-2 939.
[16]崔效锋,谢富仁.1976年唐山地震前后华北地区现代构造应力场的时空变化特征[J].中国地震,2001,17(3):280-288.
[17]李瑞莎,崔效锋,刁桂苓,等.华北北部地区现今应力场时空变化特征研究[J].地震学报,2008,30(6):570-580.
[18]Gephart J W,Forsyth D W.An improved method for determining the regional stress tensor using focal mechanism data:Application to the San Fernando earthquake sequence[J].J Geophys Res,1984,89(B11):9 305-9 320.
[19]Michael A J.Determination of stress from slip data:faults and folds[J].J Geophys Res,1984,89(B13):11 517-11 526.
[20]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):395-404.
[21]万永革.根据震源机制求解构造应力场的网格搜索法[J].国际地震动态,2012,(6):19.
[22]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[J].地震学报,2007,29(3):229-239.
[23]兰从欣,邢成起,苗春兰,等.近年首都圈地区中小震震源机制及其特征分析[J].华北地震科学,2005,23(4):21-25.
[24]万永革,吴忠良,周公威,等.几次复杂地震中不同破裂事件之间的“应力触发”问题[J].地震学报,2000,22(6):568-576.
[25]刘瑞丰,陈运泰,任枭,等.中国地震台网震级的对比[J].地震学报,2007,29(5):467-476.
[26]Shen Z K,Jackson D D,Ge B X.Crustal deformation across and beyond the Los Angeles basin from geodetic measurements[J].J Geophys Res,1996,101(B12):27 957-27 980.
[27]鄢家全,时振梁,汪素云,等.中国及邻区现代构造应力场的区域特征[J].地震学报,1979,1(1):9-24.
[28]汪素云,陈培善.中国及邻区现代构造应力场的数值模拟[J].地球物理学报,1980,23(1):35-45.
[29]曹建玲,张晶,王辉,等.首都圈现今断层活动方式的数值模拟[J].地震,2013,33(3):116-123.
[30]徐锡伟,于贵华,王峰,等.1966年邢台地震群的发震构造模式——新生断层形成?先存活断层摩擦粘滑?[J].中国地震,2000,16(4):364-378.
[31]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,2003,46(3):359-365.
[32]万永革,沈正康,兰从欣.根据走滑大地震前后应力轴偏转和应力降求取偏应力量值的研究[J].地球物理学报,2006,49(3):838-844.
[2]李钦祖,王泽皋,贾云年,等.由单台小地震资料所得两个区域的应力场[J].地球物理学报,1973,16(1):49-61.
[3]许忠淮,汪素云,黄雨蕊,等.由大量地震的资料推断我国大陆构造应力场[J].地球物理学报,1989,32(6):636-647.
[4]许忠淮.东亚地区现今构造应力图的编制[J].地震学报,2001,23(5):492-501.
[5]谢富仁,陈群策,崔效锋,等.中国大陆地壳应力环境研究[M].北京:地质出版社,2003.
[6]Wan Y G.Contemporary tectonic stress field in China[J].Earthq Sci,2010,23:377-386.
[7]徐锡伟,吴卫民,张先康,等.首都圈地区地壳最新构造变动与地震[M].北京:科学出版社,2002.
[8]沈正康,万永革,甘卫军,等.华北地区700年来地壳应力场演化与地震的关系研究[J].中国地震,2004,20(3):211-228.
[9]李钦祖.华北地壳应力场的基本特征[J].地球物理学报,1980,23(4):376-387.
[10]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):55-61.
[11]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):268-279.
[12]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):349-362.
[13]赖院根,刘启元,陈九辉,等.首都圈地区横波分裂与地壳应力场特征[J].地球物理学报,2006,49(1):189-196.
[14]李轶群,王健.唐山余震区中小地震震源机制解分区特征的初步研究[J].中国地震,2008,24(2):150-158.
[15]高原,吴晶.利用剪切波各向异性推断地壳主压应力场:以首都圈地区为例[J].科学通报,2008,53(23):2 933-2 939.
[16]崔效锋,谢富仁.1976年唐山地震前后华北地区现代构造应力场的时空变化特征[J].中国地震,2001,17(3):280-288.
[17]李瑞莎,崔效锋,刁桂苓,等.华北北部地区现今应力场时空变化特征研究[J].地震学报,2008,30(6):570-580.
[18]Gephart J W,Forsyth D W.An improved method for determining the regional stress tensor using focal mechanism data:Application to the San Fernando earthquake sequence[J].J Geophys Res,1984,89(B11):9 305-9 320.
[19]Michael A J.Determination of stress from slip data:faults and folds[J].J Geophys Res,1984,89(B13):11 517-11 526.
[20]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):395-404.
[21]万永革.根据震源机制求解构造应力场的网格搜索法[J].国际地震动态,2012,(6):19.
[22]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[J].地震学报,2007,29(3):229-239.
[23]兰从欣,邢成起,苗春兰,等.近年首都圈地区中小震震源机制及其特征分析[J].华北地震科学,2005,23(4):21-25.
[24]万永革,吴忠良,周公威,等.几次复杂地震中不同破裂事件之间的“应力触发”问题[J].地震学报,2000,22(6):568-576.
[25]刘瑞丰,陈运泰,任枭,等.中国地震台网震级的对比[J].地震学报,2007,29(5):467-476.
[26]Shen Z K,Jackson D D,Ge B X.Crustal deformation across and beyond the Los Angeles basin from geodetic measurements[J].J Geophys Res,1996,101(B12):27 957-27 980.
[27]鄢家全,时振梁,汪素云,等.中国及邻区现代构造应力场的区域特征[J].地震学报,1979,1(1):9-24.
[28]汪素云,陈培善.中国及邻区现代构造应力场的数值模拟[J].地球物理学报,1980,23(1):35-45.
[29]曹建玲,张晶,王辉,等.首都圈现今断层活动方式的数值模拟[J].地震,2013,33(3):116-123.
[30]徐锡伟,于贵华,王峰,等.1966年邢台地震群的发震构造模式——新生断层形成?先存活断层摩擦粘滑?[J].中国地震,2000,16(4):364-378.
[31]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,2003,46(3):359-365.
[32]万永革,沈正康,兰从欣.根据走滑大地震前后应力轴偏转和应力降求取偏应力量值的研究[J].地球物理学报,2006,49(3):838-844.
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