汶川地震和鲁甸地震的脉冲型地震动比较研究

发布时间：2018-10-10 18:30

【摘要】：近年来我国在近断层地震动观测及其对建筑结构地震反应的影响方面开展了有意义的工作,但我国大陆地区获取的近断层脉冲型地震动数量仍非常有限。2014年发生在云南省鲁甸县的Mw6.3级地震造成了与其震级不相称的严重伤亡和建筑震害,除建筑抗震能力和次生灾害等因素之外,破坏力强大的近断层脉冲型地震动也是重要的致灾因素。该文采用基于小波变换的脉冲识别方法,分析了在鲁甸地震中获取的地震动记录的脉冲特性,并与2008年汶川地震中的近断层脉冲型地震动进行了比较。结果显示,与汶川地震中的脉冲型地震动相比,鲁甸龙头记录速度脉冲周期较短,但其速度峰值很大,在6级左右的中等地震中非常少见。此外,该记录的能量分布具有明显的方向性。但由于该台站震中距很小,其成因能否用向前方向性效应解释仍有待商榷。
[Abstract]:In recent years, China has carried out meaningful work on the observation of near-fault ground earthquake and its influence on the seismic response of building structures. But the number of near-fault pulsed ground motions in China's mainland is still very limited. The 2014 Mw6.3 earthquake in Ludian County, Yunnan Province, caused disproportionate casualties and building damage. In addition to the seismic capacity of buildings and secondary disasters, strong destructive near fault impulse ground motion is also an important cause of disasters. In this paper, the pulse characteristics of ground motion records obtained from the Ludian earthquake are analyzed by using the method of pulse recognition based on wavelet transform, and compared with the near-fault impulse ground motion of the Wenchuan earthquake in 2008. The results show that compared with the pulse ground motion in Wenchuan earthquake, the pulse period recorded by the Ludian head is shorter, but the peak velocity is very large, which is very rare in the moderate earthquake with magnitude 6 or so. In addition, the energy distribution of this record has obvious directionality. However, as the epicentral distance of the station is very small, it is still open to question whether the cause of the formation can be explained by the forward directional effect.
【作者单位】：中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室;
【基金】：中国地震局工程力学研究所基本科研业务费面上项目(2013B13) “十二五”国家科技支撑计划课题项目(2015BAK17B03)
【分类号】：P315

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