河北南部及邻近地区中小地震震源机制特征分析
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摘要
利用P波初动和振幅相结合的广义极性振幅技术法(GPAT),反演2007—2016年河北南部及邻近地区发生的368个M_L≥2.0中小地震震源机制解,利用统计方法和系统聚类方法,分析震源机制解参数特征。结果表明,河北南部及邻区中小地震以走滑地震为主;正断层和逆断层相对较少,断层面以倾斜或直立为主,断层运动表现为左旋走滑和右旋走滑,应力作用以水平和近水平推扭方式为主。
In this paper, the generalized polar amplitude technique(GPAT) combined with P-wave initial motion and amplitude is used to invert the focal mechanism solutions of 368 M_L≥ 2.0 small and medium-sized earthquakes occurred in southern Henan and its adjacent areas from 2007 to 2016. The parameters of the focal mechanism solution parameters are analyzed by statistical methods and system clustering methods. The results show that the focal mechanism solutions of the small and medium-sized earthquakes in the southern part of Hebei Province and its adjacent areas are characterized by left-lateral strike-slip and right-lateral strike-slip. The high dip angle of the fault plane is mainly inclined or upright; the normal fault and the reverse fault are relatively less, the strike-slip earthquake is the main means that the stress mode is a horizontal and near-level push.
In this paper, the generalized polar amplitude technique(GPAT) combined with P-wave initial motion and amplitude is used to invert the focal mechanism solutions of 368 M_L≥ 2.0 small and medium-sized earthquakes occurred in southern Henan and its adjacent areas from 2007 to 2016. The parameters of the focal mechanism solution parameters are analyzed by statistical methods and system clustering methods. The results show that the focal mechanism solutions of the small and medium-sized earthquakes in the southern part of Hebei Province and its adjacent areas are characterized by left-lateral strike-slip and right-lateral strike-slip. The high dip angle of the fault plane is mainly inclined or upright; the normal fault and the reverse fault are relatively less, the strike-slip earthquake is the main means that the stress mode is a horizontal and near-level push.
引文
刁桂苓,于利民,李钦祖.震源机制解的系统聚类分析--以海城地震序列为例[J].中国地震,1992,8(3):86-92.
刁桂苓,于利民,李钦祖.大同两次MS 5.8地震序列的震源区应力场对比分析[J].地震,1995,(4):345-352.
刁桂苓,徐锡伟,陈于高,黄柏寿,王晓山,冯向东,杨雅琼.汶川MW 7.9和集集MW 7.6地震前应力场转换现象及其可能的前兆意义[J].地球物理学报,2011,54(1):128-136.
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):376-388.
梁尚鸿,李幼铭,束沛镒,朱碚定.利用区域地震台网P、S振幅比资料测定小震震源参数[J].地球物理学报,1984,27(3):249-257.
莘海亮,方盛明,李稳.豫北及邻区地震双差法重新定位研究[J].大地测量与地球动力学,2011,31(6):63-68.
吴大铭,王培德,陈运泰.用SH波和P波振幅比确定震源机制解[J].地震学报,1989,11(3):275-281.
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.
严川,许力生.一种地方与区域地震震源机制反演技术:广义极性振幅技术(一)--原理与数值实验[J].地球物理学报,2014,57(8):2 555-2 572.
严川,许力生,张旭,李春来,许康生.一种地方与区域地震震源机制反演技术:广义极性振幅技术(二)--对实际震例的应用[J].地球物理学报,2015,58(10):3 601-3 614.
俞春泉,陶开,崔效锋,胡幸平,宁杰远.用格点尝试法求解P波初动震源机制解及解的质量评价[J].地球物理学报,2009,52(5):1 402-1 411.
张丽晓,闫俊岗,宫猛.利用接收函数研究邯郸及周边地区地壳结构[J].地震地磁观测与研究,2016,37(6):21-26.
[日]宇津德治.地震事典[M].李欲彻,译.北京:地震出版社,1990.
[日]宇津德治.地震学[M].陈铁成,全莹道,译.北京:地震出版社,1981.
Dreger D S,Helmberger D V.Determination of source parameters at regional distances with three-component sparse network data[J].Journal of Geophysical Research:Solid Earth,1993,98(B5):8 107-8 125.
Hardebeck J L,Shearer P M.A new method for determining first-motion focal mechanisms[J].Bull Seismol Soc Am,2002,92(6):2 264-2 276.
Snoke J A.Earthquake mechanisms[M]//James D E.Encyclopedia of Geophysics.New York:Van Nostrand Reinhold Company,1989:239-245.
Wang R J.A simple orthonormalization method for stable and efficient computation of Green’s functions[J].Bull Seismol Soc Am,1999,89(3):733-741.
Zhao L S,Helmberger D V.Source estimation from broadband regional seismograms[J].Bull Seismol Soc Am,1994,84(1):91-104.
Zhu L P,Helmberger D V.Advancement in source estimation techniques using broadband regional seismograms[J].Bull Seismol Soc Am,1996,86(5):1 634-1 641.
刁桂苓,于利民,李钦祖.大同两次MS 5.8地震序列的震源区应力场对比分析[J].地震,1995,(4):345-352.
刁桂苓,徐锡伟,陈于高,黄柏寿,王晓山,冯向东,杨雅琼.汶川MW 7.9和集集MW 7.6地震前应力场转换现象及其可能的前兆意义[J].地球物理学报,2011,54(1):128-136.
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):376-388.
梁尚鸿,李幼铭,束沛镒,朱碚定.利用区域地震台网P、S振幅比资料测定小震震源参数[J].地球物理学报,1984,27(3):249-257.
莘海亮,方盛明,李稳.豫北及邻区地震双差法重新定位研究[J].大地测量与地球动力学,2011,31(6):63-68.
吴大铭,王培德,陈运泰.用SH波和P波振幅比确定震源机制解[J].地震学报,1989,11(3):275-281.
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.
严川,许力生.一种地方与区域地震震源机制反演技术:广义极性振幅技术(一)--原理与数值实验[J].地球物理学报,2014,57(8):2 555-2 572.
严川,许力生,张旭,李春来,许康生.一种地方与区域地震震源机制反演技术:广义极性振幅技术(二)--对实际震例的应用[J].地球物理学报,2015,58(10):3 601-3 614.
俞春泉,陶开,崔效锋,胡幸平,宁杰远.用格点尝试法求解P波初动震源机制解及解的质量评价[J].地球物理学报,2009,52(5):1 402-1 411.
张丽晓,闫俊岗,宫猛.利用接收函数研究邯郸及周边地区地壳结构[J].地震地磁观测与研究,2016,37(6):21-26.
[日]宇津德治.地震事典[M].李欲彻,译.北京:地震出版社,1990.
[日]宇津德治.地震学[M].陈铁成,全莹道,译.北京:地震出版社,1981.
Dreger D S,Helmberger D V.Determination of source parameters at regional distances with three-component sparse network data[J].Journal of Geophysical Research:Solid Earth,1993,98(B5):8 107-8 125.
Hardebeck J L,Shearer P M.A new method for determining first-motion focal mechanisms[J].Bull Seismol Soc Am,2002,92(6):2 264-2 276.
Snoke J A.Earthquake mechanisms[M]//James D E.Encyclopedia of Geophysics.New York:Van Nostrand Reinhold Company,1989:239-245.
Wang R J.A simple orthonormalization method for stable and efficient computation of Green’s functions[J].Bull Seismol Soc Am,1999,89(3):733-741.
Zhao L S,Helmberger D V.Source estimation from broadband regional seismograms[J].Bull Seismol Soc Am,1994,84(1):91-104.
Zhu L P,Helmberger D V.Advancement in source estimation techniques using broadband regional seismograms[J].Bull Seismol Soc Am,1996,86(5):1 634-1 641.