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ID 40164
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Extensive Area of Topographic Anaglyphs Covering Inland and Seafloor Derived Using a Detailed Digital Elevation Model for Tectonic Geomorphology Research : A Case Study in and around the South of the Kanto Plain and the Middle of the Nansei Islands
creator
subject
アナグリフ
数値標高モデル(DEM)
変動地形
関東平野
南西諸島
立川断層
綾瀬川断層
anaglyph
digital elevation model (DEM)
tectonic geomorphology
Nansei Islands
Tachikawa fault
Ayasegawa fault
NDC
Earth sciences. Geology
abstract
Topographic anaglyph images were viewed with red–cyan glasses, making it possible to recognize topographic relief features easily. Anaglyphs produced from digital elevation model (DEM) data are a very effective way of identifying tectonic geomorphology. This paper aims to re-examine tectonic geomorphology and to present new tectonic maps for the late Quaternary in and around the Kanto Plain and Nansei Islands. This is achieved by interpretation of an extensive area of topographic anaglyph images produced from 5-m- and 10-m-mesh inland DEMs of Japan provided by the Geospatial Information Authority of Japan, and 2-s- and 14-s-mesh DEMs of the seafloor. The 2-s-mesh DEM of the seafloor is processed from cloud point data of multi-beam echo-sounding devices provided by the Japan Agency for Marine-Earth Science and Technology and re-processed from digital bathymetric charts, with 1- to 2-m-interval counters of the Japan Hydrographic Association. The extensive area of topographic anaglyphs produced from combined detailed DEM are shown to be useful for identifying tectonic geomorphology in plain areas, as well as of the seafloor, when the “naked” topography is exaggerated vertically. We identified for the first time an active anticlinal broad deformation of the Yamanote tableland surfaces where the capital of Japan is located, as well as fault geomorphology associated with the left lateral strike–slip fault along the Ayasegawa fault in the Kanto Plain, which was believed to be a reverse fault. We also found that the marine terraces are tilted to the south at Okinoerabujima Island and eastward at Tokunoshima Island, in the middle of the Nansei Islands. These tilts are related to the reverse faults along the steep slopes of the islands’ shelves that are divided into the Okinawa trough to the west. These reverse faults, which were believed to be a normal fault from the geological research, are newly identified on the basis of the interpretation of the tectonic geomorphology on anaglyph images produced from detailed DEM of the seafloor.
description
本研究は2013~2015年度研究費補助金基盤研究(C)(課題番号25350428,研究代表者:後藤秀昭),2006~2008年度研究費補助金若手研究(B)課題番号18700681,研究代表者:後藤秀昭),2005~2007年度研究費補助金基盤研究(A)(課題番号17200053,研究代表者:中田高),2011~2014年度研究費補助金基盤研究(A)(課題番号23240121,研究代表者:中田高)の一部を使用した。
journal title
The Hiroshima University studies, Graduate School of Letters, Special Issues
volume
Volume 75
start page
1
end page
87
date of issued
2015-12
publisher
広島大学大学院文学研究科
issn
1347-7013
ncid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Letters
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