Title Transcription
ミヤザキケン ナンブ ボロイシヤマ ホクセイ シャメン ニ サンザイスル サガン ブロックグン
Title Alternative
Rectangular blocks of sandstones distributed on northwestern slopes of Mt. Boroishi-yama, southern Miyazaki, Japan
File
language
jpn
Author
Uematsu, Satoshi
Yokota, Shuichiro
Description
 Many rectangle sandstone blocks with heights of up 20 meters, are distributed along the northwestern cliff of Mt. Boroishi-yama, Miyazaki, Japan. The blocks are separated by vertical joint planes parallel or perpendicular to the cliff trend, elongated in ENE-WSW. Remarkable apertures of several meters in width occur between blocks, or between blocks and the cliff. Both the blocks and the cliff are composed of hard coarse-grained sandstones of the Miocene Miyazaki Group.
 Based on the configuration of the blocks and apertures, and the directions of bedding planes of individual blocks, a northwestward topple rotation of ten to twenty degrees was estimated. Considering that rotational movements of blocks stopped before their completely failures, the trigger for such toppling may be strong seismic vibrations within the last few hundred years.
Journal Title
島根大学地球資源環境学研究報告
Volume
28
Start Page
27
End Page
36
ISSN
13439774
Published Date
2009-12-25
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+