学会誌「自然災害科学」

自然災害科学48 Vol.17,No.4, 1999, p327f

【論考】

三つの沈島伝説と伊勢湾断層の活動

Three Legends of Submerged Islands and Activity of the Ise-Bay Fault

金折 裕司*

Yuji KANAORI*

Abstract

It has been geologically supposed that the Ise-Bay fault is located on the sea floor in Ise Bay, central Japan. On the basis of a brief review of recent multichannel and single-channel soundings, the Ise-Bay fault is found to extend south-southeastward from the mouth of the Kiso-sansen River to the Utsumi fault off the Chita peninsula. Since a NNW-SSE-trending submarine canyon passes through the mouth of the bay, a hypothetical Ise-Bay-Mouth fault possibly exists along the submarine canyon. On the other hand, three legends of submerged islands in and around Ise Bay have been passed down from generation to generation. The contents of the legends suggest that the submergence of the islands is attributed to three earthquakes whose epicenters are located in and around Ise Bay. It is likely that these earthquakes were generated by movements of the Ise-Bay and Isc-Bay-Mouth faults, dating back to 862 A.D., 1578 A.D., and 1586 A.D.

キーワード:

伊勢湾断層,1586年天正地震,沈島伝説,仮想伊勢湾口断層,活断層

Key words:

Ise-bay fault, 1586 tensho earthquake, legend of submerged island, hypothetical Ise-bay-mouth fault, active fault

*
山口大学理学部
Faculty of Science, Yamaguchi University