Japan Geoscience Union Meeting 2015

Presentation information


Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS28] Active faults and paleoseismology

Wed. May 27, 2015 4:15 PM - 6:00 PM 103 (1F)

Convener:*Takashi AZUMA(National Institute of Advanced Industrial Science and Technology), Nobuhiko Sugito(Faculty of Humanity and Environment, Hosei University), Satoshi Tonai(Department of Applied Science, Faculty of Scienece, Kochi University), Toshikazu Yoshioka(Active Fault and Earthquake Research Center, National Institute of Advanced Industrial Science and Technology), Chair:Takashi AZUMA(National Institute of Advanced Industrial Science and Technology)

5:30 PM - 5:33 PM

[SSS28-P01] DEM-derived stereo contour maps for visual analysis of tectonic geomorphology

3-min talk in an oral session

*Yasuo AWATA1 (1.Inst. Eartrhq. Volcano Geology, Geol. Surv. Japan, AIST)

Keywords:stereo contour map, stereo slope map, DEM, geomorphological analysis, tectonic geomorphology

I developed a set of stereo contour maps generated from high quality DEMs to visually analyze geomorphological features in detail. The stereo contour maps together with a stereo slope map are more intuitive and efficient for interpretation of tectonic geomrphology than any existing thematic maps.
A DEM visualization feeware, SimpleDEMViewer is used to generate 2D thematic map and 3D anaglyph map. The 2D contour map is superposed by elevation tints, slope gradation and hillshading to emphasize pseude-3D effect and micro topography. The image size of raster contour map must be adjusted according the mesh size of DEMs, contour interval and slope, and therefore multiple 2D maps are recommended to depict the variety of topography. 3D stereoscopic image in anaglyph makes a substantial visual effect to interpretation of contour maps.
Stereo contour maps are superior to depict geomorphic surface features, such as alluvial plain, fan, terrace surface, and mountain and volcano slopes. Stereo slop map is superior to highlight geomorphic line features, such as lines of ridge, valley and small scarp, and micro topography smaller than a contour interval.

Figure A stereo contour map showing the tectonic geomorphology of the Nagamachi-Rifu fault zone, Sendai, Japan, generated from 5-m-DEM. Arrows indicate the base line of the flexure scarp on terrace surfaces. Contour interval is 1 m.