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Geosciences 2018, 8(10), 363; https://doi.org/10.3390/geosciences8100363

Topographic Anaglyphs from Detailed Digital Elevation Models Covering Inland and Seafloor for the Tectonic Geomorphology Studies in and around Yoron Island, Ryukyu Arc, Japan

1
Department of Geography, Hiroshima University, Higashihiroshima 739-8522, Japan
2
The National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8560, Japan
*
Author to whom correspondence should be addressed.
Received: 3 August 2018 / Revised: 21 August 2018 / Accepted: 25 September 2018 / Published: 29 September 2018
(This article belongs to the Special Issue Glacial and Geomorphological Cartography)
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Abstract

Anaglyphs produced using a digital elevation model (DEM) are effective to identify the characteristic tectono–geomorphic features. The objective of this study is to reinvestigate the tectonic geomorphology and to present novel tectonic maps of the late Quaternary in and around the Yoron island based on the interpretation of extensive topographical anaglyphs along the map areas that cover the inland and seafloor. Vintage aerial photographs are used to produce the 3-m mesh inland digital surface model (DSM); further, the 0.6-s to 2-s-mesh seafloor DEM is processed using the cloud point data generated through previous surveys. Thus, we identify anticlinal deformation on both the Pleistocene marine terrace and the seafloor to the north of the island. The deformation axis extends in a line and is parallel to the general trend of the island shelf. The Tsujimiya fault cuts the marine terraces, which extend to the Yoron basin’s seafloor. If we assume that the horizontal compressive stress axis is perpendicular to the island shelf, these properties can easily explain the distribution and style of the active faults and deformation. This study presents an effective methodology to understand the island arc tectonics, especially in case of small isolated islands. View Full-Text
Keywords: topographical anaglyph; tectonic geomorphology; emerged coral reef; Yoron island; DEM topographical anaglyph; tectonic geomorphology; emerged coral reef; Yoron island; DEM
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Goto, H.; Arai, K.; Sato, T. Topographic Anaglyphs from Detailed Digital Elevation Models Covering Inland and Seafloor for the Tectonic Geomorphology Studies in and around Yoron Island, Ryukyu Arc, Japan. Geosciences 2018, 8, 363.

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