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タイトル: 東海地域に沈み込んだフィリピン海スラブの形状と地震活動
その他のタイトル: Configuration of the Philippine Sea Slab and the Seismic Activity in the Tokai Region
著者: 原田, 智史
吉田, 明夫
明田川, 保
著者(別言語): Harada, Satoshi
Yoshida, Akio
Aketagawa, Tamotsu
キーワード: Tokai region
Philippine Sea slab
gradient vector
seismic activity
seismogenic stress
発行日: 1999年3月29日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第73冊第3/4号, 1999.3.29, pp. 291-304
抄録: The configuration of the Philippine Sea plate subducted under the Tokai region has been investigated using JMA hypocentral data in recent years. Characteristics of the shape obtained by this study are almost the same as the previously proposed models based on seismic data of Nagoya University and NIED, respectively, for the region to the east of Ise Bay. That is, in the area to the west of Suruga Bay, the slab deepens to the west, while it inclines to the north around Lake Hamana, and a valley-like configuration is observed near Omaezaki Point and its north-west region. The deepest portion of the Tokai slab exists beneath southeastern Gifu Prefecture. We calculated the gradient vector of the subducting slab at each point on the surface using the shape of the model. By comparing the gradient vector field with the seismicity in the slab, we found a coincidence between the regions of high seismicity and the zones where the gradient vector changes greatly. This coincidence suggests the relevance between the bending of the Philippine Sea plate and the occurrence of earthquakes in the slab. On the basis of the observation we propose that one of the main causes generating seismogenic stress in the slab in the Tokai region is conformation of the Philippine Sea plate to the shape of the subducted slab in the course of plate motion.
URI: http://hdl.handle.net/2261/13166
ISSN: 00408972


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