Configuration of the Philippine Sea Slab and Seismic Activity in and around Kyushu

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  • 九州下フィリピン海スラブの形状と地震活動
  • キュウシュウカ フィリピンカイ スラブ ノ ケイジョウ ト ジシン カツドウ

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Abstract

There are several gap zones in the intermediate-depth seismicity in the Philippine Sea slab beneath Kyushu. The focal depth of the deepest earthquake increases step-like toward the south, and dip direction and inclination of the slab change from segment to segment divided by the gaps. Further, seismicity around the depth of 80km, where the slab bends steeply downwards, varies with the segments. That is, the seismicity is very low for the northern segment, whereas fairly many earthquakes occur in the middle and the southern segments, although no earthquake with M≥4 was observed in the depth range deeper than 80km in the southern segment during the period 1926 through 1990. Sectionalization is seen in the seismic activities in the Hyuganada basin. Aftershock areas of large earthquakes in the Hyuganada basin are delineated by the boundaries of the segments. Moreover, a tendency of successive occurrence of large earthquakes, first in the northern section, then in the southern section, is clearly recognized.

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