摘要
2008年5月12日汶川大地震发生后,我国大陆的固定强震动台网获得了大批的主震加速度记录,中国地震局同时迅速组织开展了余震强震动流动观测任务。通过结合汶川地震余震趋势及其空间分布特征,此次流动观测沿龙门山断裂附近布设了59台强震动仪器,观测期间发生了超过万余次的余震,并获得了3000多组3分量的强余震记录。本文选取了4次震级为6.0左右的较强余震中获取的强震动记录进行简要谱分析及衰减关系对比,旨在为进一步结合主震记录,研究近场地震动特性、地震动衰减规律等地震工程相关的科研工作提供宝贵的基础资料。最后本文针对此次流动观测部分记录出现的异常现象进行初步探讨,给出了两种解释原因。汶川地震的流动观测充分表明,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。
During the Wenchuan earthquake on May 12, 2008, National Strong Motion Observation Network System （NSMONS） of China captured hundreds of strong-motion records, and in the period more than 10 thousands of aftershocks occurred. In this paper, the mobile strong-motion observation for the disastrous earthquake is intro- duced. Following the aftershock characteristics and the spatial distribution, 59 strong-motion instruments were installed along the Longmenshan Fault, and more than 3000 groups of 3-chs record have been accumulated. The strong - motion data for 4 aftershocks were collected and preliminary analysis was done, which will benefit the further research, such as the near-field strong-motion characteristic and attenuation relationship. Finally, the causes of abnormal waveform with respect to a few of records are explored preliminarily, and two possible explanations have been presented. This observation task shows that it is necessary to perform the mobile strong-motion observation after the destructive earthquake and the collected precious data could be applied to further research.
出处
《地震工程与工程振动》
CSCD
北大核心
2009年第5期13-19,共7页
Earthquake Engineering and Engineering Dynamics
基金
中国地震局工程力学所基本科研业务基金项目(0618001)
国家科技支撑计划课题(2006BAC13B02)
国家973项目(2007CB714203)
地震行业专项基金项目(200808026)
关键词
汶川余震
流动观测
强震动仪
强震动记录
分析
Wenchuan aftershocks
mobile observation
strong-motion instrument
strong-motion record
analysis
