【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。更多还原

【Abstract】 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.更多还原