华县8(1/4)级大地震的深部地球介质背景
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摘要
从渭河断陷盆地的地壳速度场、介质品质因子等地球物理场的分布探讨了华县大地震的深部地球介质背景。结果表明,华县8(1/4)级大地震震中位于高Q值区和低Q值区的过渡带上,其孕震区是地壳内的高Q值低速区,该地震的孕育与地壳内的低速高导层、地幔上隆、孕震区内的断层及微裂隙中流体的存在与作用是密切相关的。
From the distributions of geophysics field such as the crust velocity field and medium quality factor in Weihe River breaks and falls basin,we has discussed the background of the depth Earth medium about the big earthquake of Hua county.The result indicated that the epicenter of the big earthquake with M814 in Hua county located in the transition belt of high Q value and the low Q value.Its gestation earthquake area locates in the low speed area of high Q value in the earth's crust.The gestation of the earthquake is the close correlations with the low speed and high conduction shell of the earth's crust,the upheaval of the mantle,the fault of the gestation earthquake and the existence and the function of the fluid in micro crevasse.
From the distributions of geophysics field such as the crust velocity field and medium quality factor in Weihe River breaks and falls basin,we has discussed the background of the depth Earth medium about the big earthquake of Hua county.The result indicated that the epicenter of the big earthquake with M814 in Hua county located in the transition belt of high Q value and the low Q value.Its gestation earthquake area locates in the low speed area of high Q value in the earth's crust.The gestation of the earthquake is the close correlations with the low speed and high conduction shell of the earth's crust,the upheaval of the mantle,the fault of the gestation earthquake and the existence and the function of the fluid in micro crevasse.
引文
[1]薛广盈,丁韫玉,袁志祥.渭河断陷盆地地壳速度结构的层析成像研究[J].地震学报,1997,19(3):283-290.
[2]姜家兰,黄长林.陕西地区地壳厚度初探[J].西北地震学报,1986,8(4):43-51.
[3]丁韫玉,狄秀玲,袁志祥.渭河断陷地壳三维S波速度结构和VP/VS分布图像[J].地球物理学报,2000,43(2):194-202.
[4]狄秀玲,袁志祥,丁韫玉.用折射波Sn走时反演渭河断陷及邻近地区的莫霍面速度[J].西北地震学报,1999,21(2):178-182.
[5]王卫东,杜长娥.渭河断陷盆地及邻近地区的Q值分布与地震灾害关系的初步研究[J].灾害学,2003,18(3):50-53.
[6]韩恒悦,张逸,袁志祥.渭河断陷盆地带的形成演化及断块运动[J].地震研究,2002,25(4):362-368.
[7]贺明静.华县大地震与断裂活动[J].地震研究,1986,9(4):427-432.
[8]候建军.华县大地震的地震地质条件[J].西北地震学报,1985,7(1):66-74.
[9]刘建华,刘福田,吴华,等.中国南北带地壳和上地幔的三维速度图象[J].地球物理学报,1989,32(2):143-151.
[10]孙若昧,刘福田,刘建华.四川地区的地震层析成像[J].地球物理学报,1991,34(6):708-716.
[11]孙若昧,赵燕来,梅世蓉.渤海极其邻区的地震层析成像[J].地球物理学报,1993,36(1):44-54.
[12]苏有锦,刘祖荫.丽江7.0级地震震源环境及其破裂过程[J].地震研究,1997,20(1):66-71.
[13]腾吉文,张秉明,胡家富,等.地震“孕育”的深部介质和构造环境[C].陈运泰.中国地震学研究进展.北京:地震出版社,1997,258-265.
[14]Hayder J,Al-Shukri,Brian J M.Reduced seismic velocities in the source zone of New Madrid earthquakes[J].Bull.Seism.Soc.Am,1998,78(4):1 491-1 509.
[15]苏有锦,刘祖荫,蔡民军,等.云南地区强震分布的深部地球介质背景[J].地震学报,1999,21(3):313-322.
[16]刘祖沅,胡毓良,陈禺页.单轴压缩状态下干燥和饱和岩石中超声波P的衰减[J].地球物理学报,1984,27(4):349-358.
[17]徐果明.岩石的饱和度对地震波衰减的影响[J].地震地磁观测与研究,1985,6(6):125-127.
[18]Winkler K,Nur A.Pore fluids and seismic attenuation in rocks[J].Geophys.Res.lett,1979,6(1):1-4.
[19]顾芷娟,郭才华,李彪,等.壳内低速高导层成因初步研究[J].中国科学B辑,1995,25(1):108-112.
[20]刘洁,宋惠珍.低速体与深浅断裂共同孕震过程的数值模拟初步研究[J].地震地质,2002,24(3):355-367.
[2]姜家兰,黄长林.陕西地区地壳厚度初探[J].西北地震学报,1986,8(4):43-51.
[3]丁韫玉,狄秀玲,袁志祥.渭河断陷地壳三维S波速度结构和VP/VS分布图像[J].地球物理学报,2000,43(2):194-202.
[4]狄秀玲,袁志祥,丁韫玉.用折射波Sn走时反演渭河断陷及邻近地区的莫霍面速度[J].西北地震学报,1999,21(2):178-182.
[5]王卫东,杜长娥.渭河断陷盆地及邻近地区的Q值分布与地震灾害关系的初步研究[J].灾害学,2003,18(3):50-53.
[6]韩恒悦,张逸,袁志祥.渭河断陷盆地带的形成演化及断块运动[J].地震研究,2002,25(4):362-368.
[7]贺明静.华县大地震与断裂活动[J].地震研究,1986,9(4):427-432.
[8]候建军.华县大地震的地震地质条件[J].西北地震学报,1985,7(1):66-74.
[9]刘建华,刘福田,吴华,等.中国南北带地壳和上地幔的三维速度图象[J].地球物理学报,1989,32(2):143-151.
[10]孙若昧,刘福田,刘建华.四川地区的地震层析成像[J].地球物理学报,1991,34(6):708-716.
[11]孙若昧,赵燕来,梅世蓉.渤海极其邻区的地震层析成像[J].地球物理学报,1993,36(1):44-54.
[12]苏有锦,刘祖荫.丽江7.0级地震震源环境及其破裂过程[J].地震研究,1997,20(1):66-71.
[13]腾吉文,张秉明,胡家富,等.地震“孕育”的深部介质和构造环境[C].陈运泰.中国地震学研究进展.北京:地震出版社,1997,258-265.
[14]Hayder J,Al-Shukri,Brian J M.Reduced seismic velocities in the source zone of New Madrid earthquakes[J].Bull.Seism.Soc.Am,1998,78(4):1 491-1 509.
[15]苏有锦,刘祖荫,蔡民军,等.云南地区强震分布的深部地球介质背景[J].地震学报,1999,21(3):313-322.
[16]刘祖沅,胡毓良,陈禺页.单轴压缩状态下干燥和饱和岩石中超声波P的衰减[J].地球物理学报,1984,27(4):349-358.
[17]徐果明.岩石的饱和度对地震波衰减的影响[J].地震地磁观测与研究,1985,6(6):125-127.
[18]Winkler K,Nur A.Pore fluids and seismic attenuation in rocks[J].Geophys.Res.lett,1979,6(1):1-4.
[19]顾芷娟,郭才华,李彪,等.壳内低速高导层成因初步研究[J].中国科学B辑,1995,25(1):108-112.
[20]刘洁,宋惠珍.低速体与深浅断裂共同孕震过程的数值模拟初步研究[J].地震地质,2002,24(3):355-367.
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