地震历史资料的宝贵作用在于延伸有关地震活动情况的时间间段。综合研究不同时期的地震资料,首先必须统一其强度的标度。衡量地震本身的大小,通常不外取其震级或极震区烈度。历史地震资料限于宏观现象的描述,可据以评比烈度,甚至编绘等震线图。现代地震既可根据仪器资料测定震级,又可从宏观资料得出烈度分布。震级较易测定,而宏观资料往往 The valuable function of seismic history data is to extend the period of time concerning the seismic activity. Comprehensive study of seismic data in different periods, we must first unify the scale of its intensity. Measure the size of the earthquake itself, usually without exception, its magnitude or extreme earthquake intensity. Historical seismic data is limited to the description of macroscopic phenomena and can be used to evaluate the intensity and even map the isoseismic map. Modern earthquakes can not only determine the magnitude according to the instrument data, but also get the intensity distribution from the macroscopic data. Magnitude easier to determine, and macro data often