鲁甸 MS6.5级地震强震动记录及震害分析

2014年8月3日发生的鲁甸地震是我国继2013年芦山地震之后的又一次破坏性浅源地震,造成了严重的人员伤亡和工程结构破坏.本文处理了我国数字强震动台网捕获的60余组主震三分量强震动记录,绘制了震中附近区域的峰值加速度等值线图,长轴沿西北-东南方向展布.通过与中国西部常用衰减关系的对比,发现各模型的预测值均不同程度高估了峰值加速度、峰值速度的观测值.最后以水平向峰值加速度较大的三个典型台站为例,详细调查了附近建筑的破坏情况,结合宏观烈度分布结果,分析了地震动特征与震害的相关性.

Observation of Strong Motion and Damage Investigation for MS6.5 Ludian Earthquake

The Ludian earthquake on August 3, 2014 is another destructive shallow earthquake following the 2013 Lushan earthquake. The National Strong Motion Observation Network System detected more than 60 groups of recordings during the main shock. After processing of the records, the contour map of PGA was obtained near the epicenter region, indicating the long axis along northwest-southeast. After compared the PGA and PGV of Ludian earthquake with several empirical ground attenuation relationships, we found that the relationships overestimated the ground motion of Ludian earthquake in different degrees except for some near-field stations. Finally, we chose three typical stations with recorded PGA more than 100gal to study the correlation of ground motion with macro intensity.