汶川8.0级地震序列活动的分段性研究
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摘要
在汶川8.0级地震序列的跟踪研究中,发现汶川地震序列具有明显的空间分段活动特点。根据对汶川地震余震序列的部分测震学指标计算,结果表明,汶川地震序列可能是由以绵竹为界,其西南段的汶川主-余震序列和绵竹北东段的北川-青川6级震群地震序列组成,汶川地震可能具有龙门山活动构造的继承性运动特点。
In the process of investigating the aftershock sequence of Wenchuan MS8.0 earthquake,we found that there is an obvious sectional feature in the spatial distribution of its aftershocks.According to the calculation results of some seismometry index of the aftershock sequences,the whole aftershock sequence could be divided into two sub-sequences,or the main event-aftershock sequence distributed in the Wenchuan area at the south-west part of the fault and the seismic swarm sequence with several large events of magnitude MS6.0 or greater located between Beichuan County and Qingchuan County with the boundary of Mianzhu County at the north-east part of the fault.The Wenchuan earthquake is likely to possess the characteristic of inheritance movement of active tectonics in the Longmanshan fault system.
In the process of investigating the aftershock sequence of Wenchuan MS8.0 earthquake,we found that there is an obvious sectional feature in the spatial distribution of its aftershocks.According to the calculation results of some seismometry index of the aftershock sequences,the whole aftershock sequence could be divided into two sub-sequences,or the main event-aftershock sequence distributed in the Wenchuan area at the south-west part of the fault and the seismic swarm sequence with several large events of magnitude MS6.0 or greater located between Beichuan County and Qingchuan County with the boundary of Mianzhu County at the north-east part of the fault.The Wenchuan earthquake is likely to possess the characteristic of inheritance movement of active tectonics in the Longmanshan fault system.
引文
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[3]中国地震局.地震现场工作大纲和技术指南[M].北京:地震出版社,1998.
[4]蒋海昆,傅征祥,刘杰,等.中国大陆地震序列研究[M].北京:地震出版社,2007.
[5]Utsu T.A Statistical study on the occurrence of aftershocks[M].Geophys Mag,1961,30:526-605.
[6]Utsu T,Matsu′ura R.The centenary of the Omori formula for a decay law of aftershock activity[J].J Phys Earth,1995,45:1-33.
[7]陈国光,计凤桔,周荣军,等.龙门山断裂带晚第四纪活动性分段的初步研究[J].地震地质,2007,29(3):657-673.
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