汶川8.0级地震前发震断裂带地震活动特征研究
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摘要
设定两个不同研究区域,分别就汶川8.0级地震前地震活动特征进行研究,得出以下结论:①至少在2008年5月11日之前的38年时间中,龙门山断裂带中段出现M 5.0以上地震空段,汶川巨大地震就发生在这一空段;②第一研究区域强震释放能量出现阶段性梯次减少现象;③至2008年初,估算出第一研究区域地应力积累量已达5.0136×10~(16)J,相当于一次M 7.9强震所能释放的能量;④第二研究区域中小地震在龙门山断裂带中段的南端形成了几乎垂直相交的两条地震带,小震活动明显增多。
Setting up two different research areas,respectively,seismicity of two area before Wenchuan M 8.0 earthquake are analyzed.The conclusions obtained are:①At least in the38 years before on May 11,2008,a more than M 5.0 seismic empty section appeared in the midsection of the Longmenshan fault zone,the Wenchuan great earthquake occursed in this empty section;②The energy that the strong earthquake released appeared echelon periodic decreasing phenomenon in the first study area;③To the beginning of 2008,ground stress accumulation value has amounted to 5.0136×10~(16)J,about a M 7.9 earthquake can release energy;④In the southernmost of the midsection of the Longmenshan zone,mid-small earthquakes formed two seismic zones,which cross nearly perpendicularly,in the second study area,small earthquakes clear increase.
Setting up two different research areas,respectively,seismicity of two area before Wenchuan M 8.0 earthquake are analyzed.The conclusions obtained are:①At least in the38 years before on May 11,2008,a more than M 5.0 seismic empty section appeared in the midsection of the Longmenshan fault zone,the Wenchuan great earthquake occursed in this empty section;②The energy that the strong earthquake released appeared echelon periodic decreasing phenomenon in the first study area;③To the beginning of 2008,ground stress accumulation value has amounted to 5.0136×10~(16)J,about a M 7.9 earthquake can release energy;④In the southernmost of the midsection of the Longmenshan zone,mid-small earthquakes formed two seismic zones,which cross nearly perpendicularly,in the second study area,small earthquakes clear increase.
引文
邓起东,陈社发,赵小麟.龙门山及其邻区的构造和地震活动及动力学[J].地震地质,1994,16(4):389-403.
付碧宏,时丕龙,王萍,等.2008年汶川地震断层北川段的几何学与运动学特征及地震地质灾害效应[J].地球物理学报,2009,52(2):485-495.
李勇,黄润秋,周荣军,等.龙门山地震带的地质背景与汶川地震的地表破裂[J].工程地质学报,2009,17(1):3-16.
王二七,孟庆任,陈智操,等.龙门山断裂带印支期左旋走滑运动及其大地构造成因[J].地学前缘,2001,8(2):375-384.
许志琴,李海兵,吴忠良.汶川地震和科学钻探[J].地质学报,2008,82(12):1 613-1 622.
赵珠,汪碧澜,龙思胜,等.1999年四川绵竹清平5.0级地震序列构造活动特征[J].地震地磁观测与研究,2001,22(6):30-37.
赵珠,范军,郑斯华,等.1997.龙门山断裂带地壳速度结构和震源位置的精确修定[J].地震学报,19(6):615-622.
周荣军,李勇,Densmore A L,等.青藏高原东缘活动构造[J].矿物岩石,2006,26(2):40-51.
《四川地震资料汇编》编辑组.四川地震资料汇编[M].成都:四川人民出版社,1981:193-214.
Waldhauser F,Ellsworth W L.2000.A double difference earthquake location algorithm,method and application to the Northern Hayward Fault,California[J].Bull Seism Soc Amer,90,l 353—1 368.
付碧宏,时丕龙,王萍,等.2008年汶川地震断层北川段的几何学与运动学特征及地震地质灾害效应[J].地球物理学报,2009,52(2):485-495.
李勇,黄润秋,周荣军,等.龙门山地震带的地质背景与汶川地震的地表破裂[J].工程地质学报,2009,17(1):3-16.
王二七,孟庆任,陈智操,等.龙门山断裂带印支期左旋走滑运动及其大地构造成因[J].地学前缘,2001,8(2):375-384.
许志琴,李海兵,吴忠良.汶川地震和科学钻探[J].地质学报,2008,82(12):1 613-1 622.
赵珠,汪碧澜,龙思胜,等.1999年四川绵竹清平5.0级地震序列构造活动特征[J].地震地磁观测与研究,2001,22(6):30-37.
赵珠,范军,郑斯华,等.1997.龙门山断裂带地壳速度结构和震源位置的精确修定[J].地震学报,19(6):615-622.
周荣军,李勇,Densmore A L,等.青藏高原东缘活动构造[J].矿物岩石,2006,26(2):40-51.
《四川地震资料汇编》编辑组.四川地震资料汇编[M].成都:四川人民出版社,1981:193-214.
Waldhauser F,Ellsworth W L.2000.A double difference earthquake location algorithm,method and application to the Northern Hayward Fault,California[J].Bull Seism Soc Amer,90,l 353—1 368.
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