【摘要】 2008年5月12日汶川大地震发生后,中国地震局迅速组织开展了强余震流动观测,沿龙门山断裂附近布设了59台强震动仪器.在观测期间发生了万余次余震,流动观测台网获得了2000多组3分量的强余震记录.本文介绍了流动观测台布设的技术方法与关键步骤,初步处理了2008年5月25日青川6.4级最大余震的地震动记录,并分析了此次地震动衰减特征.此次流动观测充分表明,在大地震发生后,及时有效地开展强震动流动观测是十分必要的,其获得的余震地震动记录可为进一步的科研工作提供宝贵的基础资料.更多还原

【Abstract】 After the great Wenchuan earthquake broke out on May 12, 2008, more than 10 thousands of aftershocks occurred. China Earthquake Administration performed mobile observation of strong ground motion induced by the aftershocks. With the characteristics and spatial distribution of the aftershocks considered, 59 strong ground motion instruments were installed along Longmenshan fault zone, and more than 2000 records have been accumulated. In this paper, the strong motion records for the largest M6.4 aftershock of May 25, 2008 are preliminary processed and the attenuation relation is obtaied. This work shows that it is necessary to perform mobile strong ground motion observation immediately after occurrence of destructive earthquakes, and this would offer precious data for further research.更多还原