Study on seismotectonic classification of historical earthquakes in the Japanese Islands and mutual correlation among their activities

为了更好地了解日本群岛历史地震活动的地震构造背景，对现有地震目录--Rika-Nenpyo表中列出的所有历史破坏性地震，迄今通过对古地震学研究的批判性审查，特别注意震源深度，重新审查了它们的震源区。根据震源区的位置，每一次地震都被分配到以下16个地震构造带中的一个：(1)琉球弧，(2)Hyuuga-nada，(3)菲律宾海板，(4)南开海槽，(5)日本西南外弧，(6)中线构造线，(7)日本西南内弧，(8)日本中部碰撞带，(9)最北端的伊祖弧，(10)佐上海槽，(11)南关东地区，(12)日本海东缘-日本东北内弧，(13)日本东北外弧，(14)太平洋板块，(15)千岛-日本海沟，(16)太平洋板块。通过这种重新审查和分类，许多历史地震的地震构造含义被修正；例如，几个被认为与内陆活动断裂有关的地震被证明是俯冲的菲律宾海板块内的板条事件。认识到几个地震构造带的历史地震活动之间存在一定的相关性。

In order to gain a better understanding of the seismotectonic background of the historical seismicity in the Japanese Islands, for all historical destructive earthquakes listed in the existing earthquake catalog, the Table in Rika-Nenpyo, their source regions have been reexamined through critical reviews of paleoseismological studies so far by paying special attention to the depths of sources. And each earthquake has been allocated to one of the following 16 seismotectonic zones according to the location of its source region : (1) Ryukyu Arc, (2) Hyuuga-nada, (3) Philippine Sea slab, (4) Nankai trough, (5) Southwest Japan Outer Arc, (6) Median Tectonic Line, (7) Southwest Japan Inner Arc, (8) Central Japan Collision Zone, (9) Northernmost Izu Arc, (10) Sagami trough, (11) Southern Kanto district, (12) Japan Sea Eastern Margin - Northeast Japan Inner Arc, (13) Northeast Japan Outer Arc, (14) Pacific slab, (15) Kuril - Japan trench, (16) Pacific plate. By this reexamination and classification, seismotectonic implications of many historical earthquakes have been revised ; e.g., several earthquakes which had been considered to be linked to inland active faults have proved to be slab events within the subducted Philippine Sea plate. Some correlations among historical seismic activities in several seismotectonic zones have been recognized.