地震工程学报2017，Vol.39Issue(z1)：202-208,7.DOI:10.3969/j.issn.1000-0844.2017.Supp.0202
四川筠连MS4.9地震震害特征及致灾因素分析
Analysis of the Damage Characteristics and Cause of the 2017 Junlian MS4.9 Earthquake in Sichuan Province
摘要
Abstract
In this paper,using the on-site investigation data on seismic damage induced by the Junlian MS4.9 earthquake of January 28,2017,we determine the earthquake hazard characteris-tics of different buildings and the typical seismo-geological hazards in this region.The distribution and mechanism of earthquake damage are discussed based on the geological structure,focal mech-anism,and aftershock sequence.The results indicate that buildings in the quake-hit region are mainly of brick-concrete structure,and their destruction is more serious than the buildings with a masonry-timber or a civil structure.The distribution of seismo-geological hazards is affected by many factors,such as height difference,slope gradient,and lithology.The critical factors that affected the seismic damage in this area are summarized as follows:(1 )weak seismic perform-ance and unreasonable building structures in the seismic area;(2 )prominent uneven settlement because of the weak foundations and free faces in the epicentral area;(3)complicated geological structure,including the obvious hanging wall/footwall effect of a reverse fault;(4)frequent oc-currence of small earthquakes in a short time before the Junlian MS4.9 earthquake caused remark-able accumulation of earthquake damage and increased the possibility of seismic damage;and (5) restricted by the human geographical environment,water stored on roofs intensified any asym-metric loading of the brick-concrete buildings.关键词
筠连4.9级地震/地震烈度/房屋震害/地震地质灾害/致灾因素Key words
Junlian MS4.9 earthquake/earthquake intensity/earthquake damage of building/seismo-geological hazard/damage-causing factor分类
建筑与水利引用本文复制引用
肖本夫,毛利,罗安元,祁玉萍,梁厚朗,格桑扎西,刘杨..四川筠连MS4.9地震震害特征及致灾因素分析[J].地震工程学报,2017,39(z1):202-208,7.基金项目
震情跟踪定向工作任务(2016010104) （2016010104）
四川省地震局地震科技专项项目(LY1609) （LY1609）
