| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Research Abstract |
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.
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