相邻左旋走滑和逆冲断层之间的相互作用:1976年松潘震群
摘要
根据前人研究所得1976年四川省松潘地震序列的震源参数,构造了主要地震事件的断层模型,并计算了该序列中主要地震引起的邻近区域内静弹性库仑应力变化.计算结果显示,松潘地震序列的余震主要集中分布在库仑应力增加的区域,说明大地震较好地触发了余震.计算结果还显示,左旋走滑机制的1号地震(MS=7.2)引起逆断层性质的2号地震(MS=6.7)震源处库仑应力增加了约5bar,说明1号地震对2号地震有明显的触发作用.3号地震也是左旋走滑型事件,计算显示3号震源受到1号和2号地震的共同触发不太明显.通过对右旋走滑断层和正断层理论模型的计算,显示出相邻的右旋走滑断层与逆断层间存在较好的触发关系,而平行走滑断层间的触发关系相对较弱.对比松潘地震序列中3个大震的断层组合关系,研究认为3号地震存在被触发的可能.
引文
1四川省地震局.一九七六年松潘地震.北京:地震出版社,1979
2Chen S F,Wilson C J L,Deng Q D,et al.Active faulting and block movement associated with large earthquakes in the Min Shan and Longmen Mountains,northeastern Tibetan Plateau.J Geophys Res,1994,99:24025—24038
3闻学泽,白兰香.鲜水河断裂带北西段地壳破裂图像及地震构造.见:四川省地震局,编.鲜水河断裂带地震学术讨论会文集.北京:地震出版社,1985.33—40
4Allen C R,Luo Z L,Qian H,et al.Field study of a highly active fault zone:The Xianshuihe fault of southwestern China.Bull Geol Soc Am,1991,103:1178—1199
5刘桂萍,傅征祥.1973年炉霍大地震(MS=7.6)最大余震(MS=6.3)的库仑破裂应力触发.中国地震,2002,18(2):175—182
6Jones L M,Han W B,Hauksson E,et al.Focal mechanism and aftershock locations of the Songpan earthquake of August1976in Si-chuan China.J Geophys Res,1984,89(B9):7607—7707
7成尔林,李桂芳,陈和川,等.1976年四川省松潘——平武7.2级地震前后主压应力轴的方向特征.地震学报,1982,4(2):136—148
8刁桂苓,程万正,李桂芳,等.1976年松潘地震序列的小震震源机制地震.地磁观测与研究,1996,17(5):34—41
9Okada Y.Internal deformation due to shear and tensile faults in a half-space.Bull Seismol Soc Am,1992,82(2):1018—1040
10Toda S,Stein R S.Response of the San Andreas fault to the1983Coalinga-Nu?ez Earthquake:An application of interaction-based probabilities for Parkfield.J Geophys Res,2002,107,10.1029/2001JB000172
11King G C P,Stein R S,Lin J.Static stress changes and the triggering of earthquakes.Bull Seismol Soc Am,1994,84:935—953
12Aki K.Earthquake generating stress in Japan for the years1961to1963obtained by smoothing the first motion patterns.Bull Earth-quake Res Inst,1966,44:447—471
13万永革,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.地震学报,2000,22(6):568—576
14Freed A M,Lin J.Delayed triggering of the1999Hector Mine earthquake by viscoelastic stress transfer.Nature,2001,411:180—183
2Chen S F,Wilson C J L,Deng Q D,et al.Active faulting and block movement associated with large earthquakes in the Min Shan and Longmen Mountains,northeastern Tibetan Plateau.J Geophys Res,1994,99:24025—24038
3闻学泽,白兰香.鲜水河断裂带北西段地壳破裂图像及地震构造.见:四川省地震局,编.鲜水河断裂带地震学术讨论会文集.北京:地震出版社,1985.33—40
4Allen C R,Luo Z L,Qian H,et al.Field study of a highly active fault zone:The Xianshuihe fault of southwestern China.Bull Geol Soc Am,1991,103:1178—1199
5刘桂萍,傅征祥.1973年炉霍大地震(MS=7.6)最大余震(MS=6.3)的库仑破裂应力触发.中国地震,2002,18(2):175—182
6Jones L M,Han W B,Hauksson E,et al.Focal mechanism and aftershock locations of the Songpan earthquake of August1976in Si-chuan China.J Geophys Res,1984,89(B9):7607—7707
7成尔林,李桂芳,陈和川,等.1976年四川省松潘——平武7.2级地震前后主压应力轴的方向特征.地震学报,1982,4(2):136—148
8刁桂苓,程万正,李桂芳,等.1976年松潘地震序列的小震震源机制地震.地磁观测与研究,1996,17(5):34—41
9Okada Y.Internal deformation due to shear and tensile faults in a half-space.Bull Seismol Soc Am,1992,82(2):1018—1040
10Toda S,Stein R S.Response of the San Andreas fault to the1983Coalinga-Nu?ez Earthquake:An application of interaction-based probabilities for Parkfield.J Geophys Res,2002,107,10.1029/2001JB000172
11King G C P,Stein R S,Lin J.Static stress changes and the triggering of earthquakes.Bull Seismol Soc Am,1994,84:935—953
12Aki K.Earthquake generating stress in Japan for the years1961to1963obtained by smoothing the first motion patterns.Bull Earth-quake Res Inst,1966,44:447—471
13万永革,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.地震学报,2000,22(6):568—576
14Freed A M,Lin J.Delayed triggering of the1999Hector Mine earthquake by viscoelastic stress transfer.Nature,2001,411:180—183
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