• 责任者：Du Peng (China University of Geosciences ; Beijing 100083 ; China) ; Chai Chizhang
• 刊名：Seismology and Geology
• 出版年：2009
• 卷期：31(2)
• 关键词：全新世 ; Holocene ; 古地震 ; paleoearthquakes ; 贺兰山 ; Helan Mountains
• 页码：p.256-264
• 图表：6 illus., 2 tables, 7 refs.
• 分类号：0500
• issnNo：ISSN0253-4967
• isbnNo：CN11-2192/P

The eastern piedmont fault of Helanshan Mountains is an important tectonics controlling the west boundary of Yinchuan graben. The south segment of the fault locates right in the west of Yinchuan City, which has a length of about 13.2 km, strikes NNE-NE and dips south-east at an angle of 50°～80°. This paper selects the region on the two banks of Dashitou channel to excavate two trenches along the fault based on 1:10 000 geological mapping of the fault area. The result reveals three events since 14 ka B.P. with the ages of 13.8, 7.9 and 3.0 ka B.P. and the recurrence intervals of 6 and 5 ka, respectively.