利用国家数字地震台网记录计算汶川地震余震峰值加速度分布图  

Mapping PGA Contours From China National Digital Seismic Network Records

作　　者：俞瑞芳[1] 俞言祥[1] 肖亮[1] 徐伟进[1] 

机构地区：[1]中国地震局地球物理研究所,北京100081

出　　处：《国际地震动态》2008年第6期4-8,共5页Recent Developments in World Seismology

摘　　要：数字地震台网可实时获取地震记录,因此可据此快速计算地震动参数,如峰值加速度、峰值速度的分布图,为震后救灾提供参考依据。本文对国家数字地震台网的地震记录,采用插值型求导公式中的两点公式计算加速度时程,并通过计算原始记录和仿真加速度时程的幅值谱,检验了结果的可靠性。最后对汶川大地震后的两个强余震进行了计算和分析,作出了峰值加速度分布图。Records of China National Digital Seismic Networks are real-time transmitted, so it is possible to rapidly assess ground motion distribution after strong earthquake occurred and to serve the earthquake emergency response and disaster relief. In this paper, an interpolative differential method was applied to the digital seismic records to recover ground acceleration time histories. This method＇s reliability was then verified by comparing the amplitude spectra of original record with em- ulative acceleration time history. The peak ground acceleration （PGA） distribution maps of two strong aftershocks of great Wenchuan earthquake are generated by using proposed method.

关 键 词：国家数字地震台网 峰值加速度 

分 类 号：P315.9[天文地球—地震学]