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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。
The Ludian earthquake on August 3, 2014 is another destructive shallow earthquake in our country since the Lushan earthquake in 2013, causing serious human casualties and structural damage. In this paper, the strong vibration records of more than 60 groups of main shocks captured by strong digital seismic network in China were processed and the contour maps of peak acceleration in the vicinity of the epicenter were plotted. The long axis was distributed along the northwest-southeast direction. By comparing with the commonly used decay relations in western China, it is found that the predictive values of each model overestimate the observed values of peak acceleration and peak velocity in varying degrees. Finally, taking three typical stations with large horizontal accelerations as an example, the damage of nearby buildings was investigated in detail. The correlation between the seismic characteristics and seismic damage was analyzed based on the distribution of the macroscopic intensity distribution.