梓潼地区地震活动异常调查
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摘要
2012年6月底至7月初,在梓潼县交泰乡过去弱地震活动区连续发生多次小震,地震事件引起四川省地震局的高度重视,为此,四川省地震局组成异常落实工作组就地震事件开展现场落实。本文基于区域地震活动特征及序列特征,对区域地震危险性进行了初步分析,认为该区域地震活动增强与汶川地震具有密切关系,地震可能是汶川地震的发生改变了紧邻龙门山断裂带的四川盆地及边缘地区的应力状态所致。因此,分析认为该地区近期小震活动性丛集可能与汶川地震震后区域应力场调整有关。
It had been paid close attention by leaders of all levels of Earthquake Administration of Sichuan Province that multiple small earthquakes occurred continuously in Jiaotai Town of Zitong County,where used to bea weak seismic activity region from the end of June to the early July in 2012. Therefore,Earthquake Administration of Sichuan Province set up an anomaly-ascertaining workgroup to ascertain on the spot. In this paper,as regional seismic risk has been preliminarily analyzed from the regional seismic activity and earthquake sequence characteristics,the increase of seismic activity in this region is considered to be closely related to the 2008 Wenchuan Earthquake.The seismicity in this area may be caused by the change of stress state in and around Sichuan Basin where are closely adjacent to Longmenshan fracture zone. Consequently,it is considered by the preliminarily analysis that the recent cluster of small earthquakes in this region may be also related to the regional stress field adjustment after the 2008 Wenchuan Earthquake.
It had been paid close attention by leaders of all levels of Earthquake Administration of Sichuan Province that multiple small earthquakes occurred continuously in Jiaotai Town of Zitong County,where used to bea weak seismic activity region from the end of June to the early July in 2012. Therefore,Earthquake Administration of Sichuan Province set up an anomaly-ascertaining workgroup to ascertain on the spot. In this paper,as regional seismic risk has been preliminarily analyzed from the regional seismic activity and earthquake sequence characteristics,the increase of seismic activity in this region is considered to be closely related to the 2008 Wenchuan Earthquake.The seismicity in this area may be caused by the change of stress state in and around Sichuan Basin where are closely adjacent to Longmenshan fracture zone. Consequently,it is considered by the preliminarily analysis that the recent cluster of small earthquakes in this region may be also related to the regional stress field adjustment after the 2008 Wenchuan Earthquake.
引文
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[2]张开洪.川西北梓潼地区上三叠统天然气资源评价[J].西南石油学院学报,1992,5(2):1-8.
[3]李俊,陈智伟,李金龙,等.浙江珊溪水库重复地震事件研究[J].华南地震,2012,32(增刊):88-95.
[4]王婷婷,边银菊.识别天然地震和人工爆破的判据选择[J].地震地磁观测与研究,2011,32(6):62-67.
[5]杨成荣,王桂岭,敖雪明.乌鲁木齐附近地区小爆破识别判距的研究[J].内陆地震,2001,15(1):30-38.
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