Abstract: A further discussion is made on the method for delineation of focal areas of large historic earthquakes from data of recent small earthquake activity and from genetical viewpoint on the principles and methods for the delineation and some quantitative criteria. A few earthquake examples are also cited in this paper for analysing and checking the effectiveness of the methods.

Key words: Large historic earthquake area, Focal parameters, Seismic effect, Earthguake frequence

摘要： 利用现代小震活动性资料确定历史大震区的方法原則和方法的定量判据方面作了进一步的探讨,并以少数震例作了分析和检验。

关键词: 历史大震区, 震源参数, 大震后效, 频次