摘要
本文据断裂带的断层几何形态、组合型式、断错地貌及地震活动资料,讨论了安宁河断裂带北段(西昌-石棉田湾段)在晚更新世以来的活动性状。根据该段活动程度的差异,从南至北将其分为三个活动段,即西昌-冕宁段;冕宁-紫马垮段;紫马垮-田湾段。上述三个活动段除南段具备发生大震背景外,中段和北段分别具有发生强震和中强震的背景。根据断层泥中石英碎屑表面扪描电子显微(SEM)结构特征,讨论了安宁河断裂带北段的运动性质,指出西昌-紫马垮段具粘滑运动方式;紫马垮-麂子坪段具粘滑、蠕滑兼有的运动方式;麂子坪以北至田湾段具以蠕滑为主的运动方式。
Based on fault geometrical feature,composed,faulting landforms and seismic data,this paper dis cussed the activity feature on the north segment of the Anninghe fault(from Xichang to Shimian) si nee late Pleistocene, The fault can be devided into three active segments by discrepancies of activity, the segment from Xichang to Mianning, the segment from Mianning to Zimakua and segment from Zi makua to Tianwan successively from south to north. The south segment has the capacity of generating great earthquakes,but the middile and the north segments can generate strong and moderate events re spectively. According to the features of Quartz from fault clay by scanning electron microstructure (SEM) ,this paper discussed the motion feature along the fault and indicated the frictional slip feature on the segment from Xichang to Zimakua,the creeping feature on the segment from Jiziping to Tian wan and the transitional feature on the segment in between.
出处
《中国地震》
CSCD
北大核心
1992年第3期60-68,共9页
Earthquake Research in China
