关键词: 岷县漳县M_S6.6地震, 震害, 应急科考

Abstract:

At 7: 45 on July 22,2013,an M_S6.6 earthquake hit Minxian County(34.5°N,104.2°E)of Dingxi City in Gansu Province,which brought 95 deaths and after which an emergency response of second grade was declared by China Earthquake Administration. In this earthquake,the intensity of the meizoseismal region is Ⅷ.Buildings in quake-hit region are mainly of civil structure and timber structure,which account for more than 90%.Unfortunately the anti-seismic ability of these two kinds of buildings is poor. To make things worse,most of them are old. And it had been rainy for days before the earthquake,which lowered the support ability of the foundation and the wall. After the earthquake,in comparison with other earthquakes,buildings of civil structure and timber structure are damaged more heavily in the region of the same intensity,and the damage of buildings of both brick structure and brick-concrete structure is obviously lighter. Significantly thick loess coverage and continuous rainfall gave birth to many landslides. For these reasons,the regions of both Ⅷ and Ⅵ intensity are relatively larger. Dingxi City,which the earthquake hit,is one of the most undeveloped regions in China,and the proportion of buildings of civil structure and timber structure,which behaved badly in the earthquake,is abnormally large. Thus it is suggested that the reconstruction aid should be expanded so that buildings can be built with the masonry-timber and brick-concrete as the main structures.

Key words: Minxian-Zhangxian M_S6.6 earthquake, earthquake hazard, emergency science research