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1.前言近年来,随着通用计算机和个人计算机的普及,有关用统计方法处理地震活动的研究不断增加。在这些研究中,作为其对象的地震活动资料,大都使用广泛流通的气象厅震源目录文件(以下简称为“气象厅目录”)。但这种目录随着气象厅地震观测和震源测定法的变迁,在内容上没有保证时间的均一性。关于这方面的情况,虽已有一些介绍,但参加气象厅地震观测多年的成员开始大量退休,详细了解震源资料变迁历史的人越来越少,而且,最近使用 SEIS-PC 的人在增加,因此,可能会有
1. Introduction In recent years, with the popularity of general purpose computers and personal computers, there has been an increasing number of studies dealing with seismicity using statistical methods. In these studies, most of the seismic activity data for this purpose are widely circulated Meteorological Agency source catalog documents (hereinafter referred to as “Meteorological Agency catalogs”). However, with the changes of the Meteorological Agency’s seismic observation and source determination method, this catalog does not guarantee the uniformity of time. Although some presentations have been made in this regard, members who have been participating in Meteorological Agency seismological observatories for many years have begun to retire in large numbers. Fewer and fewer people have got a detailed understanding of the history of source data changes. Moreover, the number of people using SEIS-PC has increased recently, So maybe there