中国地质Issue(1)：43-55,13.
汶川地震断裂带多次地震活动新证据
New evidence of repeated earthquakes along Wenchuan earthquake fault zone
摘要
Abstract
High resolution magnetic susceptibility and detailed rock magnetism studies of the Yingxiu-Beichuan fault zone were conduced on the field section at Bajiaomiao, Hongkou Town. The systematic analysis reveals the existence of quite a few high magnetic susceptibility fault rock zones. A brown layer fault rock has the following features:(1) the highest magnetic susceptibility, (2) significant characteristics of magnetite new formation, and (3) similar demagnetization behavior of natural remanent magnetization and anhysteretic remanent magnetization. The principal mechanism responsible for the high magnetic susceptibility of the brown fault rock was most likely caused by the production of new magnetites from iron-bearing paramagnetic minerals. These new magnetites might be formed by frictional heating on slip planes along a seismic fault. Combined with the analytical result of the core from the first drill hole of the Wenchuan Earthquake Fault Scientific Drilling Project (WFSD-1), the authors hold that the presence of high magnetic susceptibility fault gouges in the same country rock can be considered to be an indicator of earthquakes or seismic signatures. Quite a few layers of high magnetic susceptibility fault rocks indicate that strong earthquake repeatedly occurred along Wenchuan earthquake fault zone.关键词
汶川地震断裂带/映秀-北川断裂带/断层岩/磁化率/摩擦生热Key words
Wenchuan earthquake fault zone/Yingxiu-Beichuan fault zone/fault rocks/magnetic susceptibility/frictional heating分类
天文与地球科学引用本文复制引用
裴军令,周在征,李海兵,王焕,刘锋,盛美,赵越..汶川地震断裂带多次地震活动新证据[J].中国地质,2016,(1):43-55,13.基金项目
国家自然科学基金项目（41172177，41330211）和国家科技支撑项目“汶川地震断裂带科学钻探”资助。 （）
