Study of Paleoearthquakes by Combined Trench on Zemuhe Fault around Daqingliangzi,Xichang, Sichuan Province

详细信息   

• 责任者：Tian Qinjian (China Earthquake Disaster Prevention Center ; Beijing 100029 ; China) ; Ren Zhikun
• 刊名：Seismology and Geology
• 出版年：2008
• 卷期：30(2)
• 关键词：古地震 ; paleoearthquakes ; 四川 ; Sichuan
• 页码：p.400-411
• 图表：7 illus., 1 table, 37 refs.
• 分类号：0500
• issnNo：ISSN0253-4967
• isbnNo：CN11-2192/P

摘要

There exist some uncertainties in dating paleoearthquakes. To improve the credibility of determination of the earthquakes, comprehensive analysis of movement patterns, sedimentary environment and micro-topography has been made to investigate the paleoseismic events along the Zemuhe active fault zone. Combined trenches were excavated near Daqingliangzi, which reveal three palaeoearthquakes with ages of 160 a, 3 100 a and 5 500～8 900 a, respectively, and a recurrence interval of about 3 000 years. Sedimentary processes related to strike-slip fault type earthquakes are discussed and a sedimentary model is put forward for strike-slip fault on condition that bulges and reverse scarps were formed at hillside area.