Late-Quaternary Movement Along the Sertengshan Piedmont Fault and a Model for Segmentation of Its Rupture

摘要

Analysis and study of the geometrical structure of the fault, tectonic features of late-Quaternary movement, paleoseisimic activity, and structural characteristics of boundaries between segments of the Sertengshan piedmont fault permitted us to preliminarily determine the following 4 active segments of the fault: the Wujiahe segment (from Dongwugai Gully to Dahoudian Village), Wujumengkou-Dongfeng Village segment (from Dahoudian to Delingshan), Dashetai segment (from Delingshan to Xiaoshetai Gully mouth), and the Ulan Hudong segment (from Xiaoshetai Gully mouth to Tailiang). The boundaries between them are the Dagoudian mountain spur, the Delingshan Mountain spur and the step zone at Xiaoshetai Gully mouth, respectively. The segments are independent for seismic activity. However, it is possible that joint ruptures between Wujiahe and Wujumengkou-Dongfeng Village segments and between Dashetai and Ulan Hudong segments may occur.