Tectonics and Seismicity of the Yarlung Tsangpo Grand Canyon Region
The Yarlung Tsangpo Grand Canyon region is located in the frontal zone of the eastern Himalayan syutaxis, where neo-tectonics and seismicity are intensive and closely related to each other. In the region, two sets of fault structures have developed, striking NNE-NE and NWW-NW, respectively. Investigation shows that they differ markedly in terms of scope, property, active times and intensity. The NWW-NW trending faults are large in size, and most are thrust and thrust strike-slip faults, formed in earlier times. The NEE-NE-strike faults are relatively small in size individually, with concentrated distribution, constituting the NNE-trending shear extensional fault zone, which is relatively younger with evident late Quaternary activities. Strong earthquakes occur mainly in the areas or zones of intensive differential movement of the Himalayas, e.g. along the deep and large fault zones around the crustal blocks. Most earthquakes of M≥7.0 are closely related to tectonics, where large-scale Holocene active faults are distributed with complicated fault geometry, or the faults of multiple directions intersect. Among them, earthquakes of M≥7.5 have occurred on the NW and NE-trending faults with a greater strike-slip component in the fault tectonic zones.
作 者： Shao Cuiru You Huichuan Cao Zhongquan Wang Chunyong Tang Fangtou Zhang Decheng Lou Hai Xu Guangyin Yang Qiyan Mei Tuo Xie Ping Yu Gang 作者单位： Shao Cuiru,You Huichuan,Wang Chunyong,Lou Hai,Xu Guangyin(Institute of Geophysics, CEA, Beijing 100081, China)Cao Zhongquan,Mei Tuo,Xie Ping(Earthquake Administration of Tibet Autonomous Region, Lhasa 850000, China)
Tang Fangtou(Crust Movement Monitoring Engineering and Research Center, CEA, Beijing 100036, China)
Zhang Decheng(Institute of Earthquake Science, CEA, Beijing 100036, China)
Yang Qiyan(Institute of Crustal Dynamics, CEA, Beijing 100085, China)
Yu Gang(Institute of Geology, CEA, Beijing 100029, China)
刊 名： 中国地震研究（英文版） 英文刊名： EARTHQUAKE RESEARCH IN CHINA 年，卷(期)： 2009 23(2) 分类号： P3 关键词： Yarlung Tsangpo Grand Canyon Tectonics Earthquake