岡山大学 地球科学研究報告
Published by Okayama University Earth Science Reports Editorial Committee

A new method of terrace analysis to determine precise altitudes of former shoreline

Amano, Hideki Graduate School of Natural Science and Technology, Okayama University
Suzuki, Shigeyuki Graduate School of Natural Science and Technology, Okayama University
Sato, Masaru Hanshin Consultants Co., Ltd.,
Yanagida, Makoto Hanshin Consultants Co., Ltd.,
Abstract
The study area is situated in Japan Sea side margin of the Shakotan Peninsula, Hokkaido, Japan, where MIS5e Terrace is preserved along the cost. Numbers of tight drilling have done to establish new method for terrace analysis. Buried wave cut terrace and sea cliff (when the MIS5e Terrace was formed) are reconstructed by distribution of the terrace deposits and these bottom of unconformity planes. The precise site and altitude of former shoreline was also obtained. Altitudes of the former shoreline from the 7 sections are almost the same 22 to 27m in height. Previous data of the height of shoreline are obtained from the topographic MIS5e Terrace surface. The altitudes have variation from 30m to 60m. It suggests that the traditional method for the MIS5e terrace analysis had some errors in the study area.
Keywords
MIS5e
marine terrace
terrace deposits
tight drilling
shoreline
ISSN
1340-7414
NCID
AN10506284