巴东Ms5.1地震震害分布特征

TYPICAL CHARACTERISTICS OF DAMAGE OF BADONG Ms5.1 EARTHQUAKE

基于现场调查资料,对巴东Ms5.1地震震害分布进行分析。分析表明,极震区为Ⅶ度区,集中在巴东县东瀼口镇宋家梁子一带,呈NW-SE向展布,长轴约3.9 km,短轴约2.4 km,面积约7.7 km2;Ⅵ度区整体呈近东西向,长轴约21.4 km,短轴约13.6 km,面积251 km2;震害与建筑物的抗震性能有较大关系,老旧建筑物破坏严重,三峡移民工程等新建房屋基本完好;烈度异常点可能与断裂构造、岩溶有关。

Badong Ms5.1 earthquake in Hubei province caused various damages involving some of rural buildings, and seismic casualty is appeared in meizoseismic area. Based on the field investigation in the earthquake effected area, in this paper, primary characteristics of the typical damages of this earthquake are summarized. Analysis showed that：The meizoseismal area of VII degree area,which focused on the town of Badong County rang SongjialiangZi area, was NW-SE trending, long axis length of 3.9 km, the minor axis length of 2.4 km, an area of about 7.7 km2. VI degree area was nearly the whole thing to the long axis of about 21.4 km,minor axis length 13.6 km, area 25.1 km2. The map of seismic intensity are trustworthy. Damages have a greater relationship with the seismic performances of buildings. This buildings of the Three Gorge immigration engineering is largely intact. Initial discussion some relationships of the intensity and faults, karst distribution.