PRELIMINARY ANALYSIS OF EARTHQUAKE OCCURRENCE BACKGROUNDS OF Ms≥8.0 CATASTROPHIC EARTHQUAKES IN MIDDLE AND EAST PARTS OF CHINESE CONTINENT
(1. Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China；2. Institute of Mineral Resources，Chinese Academy of Geological Sciences，Beijing 100037，China)
Abstract：The earthquake occurrence backgrounds of Ms≥8.0 catastrophic earthquakes in the middle and east parts of Chinese Continent are discussed from aspects of tectonic landform，geological mass features and its physico-mechanical properties，present GPS displacement field，active fault，contemporary tectonic stress and energy field，and so on. Preliminary results show that earthquake，which is triggered by a sudden release of the concentrated geo-stress and energy in the interior of the earth，is one kind of activities in local or regional crust；and that the location of earthquake is always the active tectonic zone or weak belt in the crust，such as active fracture belt，etc.；and that the geo-stress and energy are always concentrated in the evolution process of active fracture belt in the crust while the active fracture belt passing through and being blocked by the special geological environments，such as tectonic landform，rigid crystalline basement，etc.. When the concentrated geo-stress and energy exceed the strength of rock or rock mass，the rock or rock mass will be broken，so an earthquake will be triggered. Active tectonics and geological mass features and physico-mechanical properties are necessary conditions for earthquake occurrence，and geo-stress and energy concentration are sufficient conditions for earthquake occurrence. At last，the key region which should be paid attention to for a mid-long term in the middle and east parts of Chinese Continent and the working suggestions are proposed.
谭成轩1，秦向辉1，王瑞江2，龙长兴1，邓乃恭1，孙 叶1，张春山1，孙炜锋1. 中国大陆中东部Ms≥8.0级特大地震发震背景初步分析[J]. 岩石力学与工程学报, 2010, 29(S2): 3598-3607.
TAN Chengxuan1，QIN Xianghui1，WANG Ruijiang2，LONG Changxing1，DENG Naigong1，SUN Ye1，ZHANG Chunshan1，SUN Weifeng1. PRELIMINARY ANALYSIS OF EARTHQUAKE OCCURRENCE BACKGROUNDS OF Ms≥8.0 CATASTROPHIC EARTHQUAKES IN MIDDLE AND EAST PARTS OF CHINESE CONTINENT. , 2010, 29(S2): 3598-3607.
2010, Vol. 29 
