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本文叙述了1976年7月28日唐山7.8级地震及其余震的观测和强震记录数字化的概况,分析了地震动加速度最大值与震级、震中距的关系和持续时间随震级的变化,讨论了局部场地条件、传播途径和震源特性对地震动频谱和反应谱的影响,同时给出了唐山地震主震时被观测的几个典型结构的主要观测结果。
This paper describes the observation of digital earthquakes of MS7.8 Tangshan earthquake and its aftershocks on July 28, 1976 and the digitization of strong earthquake records. The relationship between maximum earthquake acceleration and magnitude and epicentral distance and the variation of duration with magnitude are discussed. The influence of local site conditions, transmission routes and source characteristics on the spectrum and response spectrum of ground motion, and the main observations of several typical structures observed during the main shock of the Tangshan earthquake.