技術報告 REPORT OF HYDROGRAPHIC AND OCEANOGRAPHIC RESEARCHES No.54 March, 2017 D 3D bathymetric image of the southwestern part of the Kuril Trench and its

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1 技術報告 REPORT OF HYDROGRAPHIC AND OCEANOGRAPHIC RESEARCHES No.54 March, 2017 D 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI, Yukari KIDO, Hideaki GOTO, and Takashi NAKATA Abstract We interpreted submarine landforms using anaglyph images based on m DEM Digital Elevation Model processed from multibeam data collected by Japan Coast Guard and JAMSTEC in the area around the southwestern part of the Kuril Trench, from off Shikotan Island to Erimo Seamount, and made more precise submarine active fault maps than those produced by previous researchers. Reverse faults are mainly distributed along the northern margin of the Kuril Trench and along the foot of continental slope, while normal faults are found along the boundary of the submarine basin and the outer ridge off Kushiro. These faults are considered deeply related to large earthquakes on the plate boundary between subducting Pacific plate and Hokkaido continental mass. 1 はじめに Received September, ; Accepted November, Hydrographic and Oceanographic Department, th R.C.G.Hqs. Ocean Research Laboratory, Technology Planning and International Affairs Division Continental Shelf Surveys Office, Hydrographic Surveys Division Japan Agency for Marine Earth Science and Technology Hiroshima University Professor Emeritus of Hiroshima University

3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity 2 マルチビーム測深データについて 2.1 海上保安庁海洋情報部の調査概要 2.2 海洋研究開発機構 (JAMSTEC) の調査概要 JAMSTEC JAMSTEC DARWIN http://www.godac.jamstec.

2 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity 2 マルチビーム測深データについて 2.1 海上保安庁海洋情報部の調査概要 2.2 海洋研究開発機構 (JAMSTEC) の調査概要 JAMSTEC JAMSTEC DARWIN j Table Fig. Table JAMSTEC research cruises that cover the area of southwestern region of the Kuril Trench. JAMSTEC Fig. Track chart of JAMSTEC vessels around Southeast Hokkaido and off North Tohoku vicinity area. JAMSTEC five research vessels are shown by different colors; R/Vs Natsushima red, Kaiyo light blue, Yokosuka green, Kairei blue and Mirai orange. Contour interval is, m based on ETOPO bathymetry data. JAMSTEC, m ETOPO Swept Beam

3 Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. JAMSTEC ; Tsuru et al. Tsuru et al. Time-lapse Fujiwara et al. JAMSTEC jamstec.go.jp/dataportal/viewer.htm /j 3 詳細 DEM 画像の作成 m DEM Digital Elevation Model m DEM SRTM DEM Simple DEM Viewer DEM 4 千島海溝沿いの海底地形に関するこれまでの研究 M M. M. M. M. M. M

4 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity m m m JAMSTEC m DEM 5 アナグリフ画像による海底地形の観察 Fig. a Fig. b Fig. a m Fig. 5.1 襟裳海山の海底地形 Fig. a Fig. b m ; Tsuru et al.

Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. Fig. a Anaglyph image of study area including the northern part of Japan Trench and Hidaka Trough top.

5 Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. Fig. a Anaglyph image of study area including the northern part of Japan Trench and Hidaka Trough top. b Bathymetric map with names of submarine topography and locations on land bottom. Contour interval is m. Boxes indicate areas for detailed description of submarine landform. a b m

6 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity Fig. Classification of seafloor topography around the Kuril Trench in this study. m km m m

7 Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. Fig. a Anaglyph image around Erimo Seamount top. b Bathymetric map with names of submarine topography around Erimo Seamount bottom. Contour interval is m. Red line: reverse fault, black line: normal fault, broken line: inferred fault, brown line: crown of large submarine landslide. a b m.

8 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity m m 5.2 釧路海底谷下流部の海底地形 Fig. a Fig. b m km m m m km km 5.3 釧路海底谷中流部の海底地形 Fig. a Fig. b m Fig. K- km m 5.4 釧路海底谷上流部の海底地形 Fig. a Fig. b m

9 Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. Fig. a Anaglyph image around lower drainage of Kushiro Submarine Canyon top. b Bathymetric map with names of submarine topography around lower drainage of Kushiro Submarine Canyon bottom. Contour interval is m. Red line: reverse fault, black line: normal fault, broken line: inferred fault, brown line: crown of large submarine landslide. a b m.

3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity Fig. a Anaglyph image around middle drainage of Kushiro Submarine Canyon top.

10 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity Fig. a Anaglyph image around middle drainage of Kushiro Submarine Canyon top. b Bathymetric map with names of submarine topography around middle drainage of Kushiro Submarine Canyon bottom. Contour interval is m. Red line: reverse fault, black line: normal fault, broken line: inferred fault, brown line: crown of large submarine landslide. a b m.

11 Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. Fig. Compiled multi-channel seismic records in the southwestern part of Kuril Trench. Modified from original records by JAMSTEC. Blue arrow indicates the location of reverse fault. m 5.5 釧路沖陸棚斜面の地形 Fig. a Fig. b m km m

3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity Fig. a Anaglyph image around upper drainage of Kushiro Submarine Canyon top.

12 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity Fig. a Anaglyph image around upper drainage of Kushiro Submarine Canyon top. b Bathymetric map with names of submarine topography around upper drainage of Kushiro Submarine Canyon bottom. Contour interval is m. Red line: reverse fault, black line: normal fault, broken line: inferred fault, brown line: crown of large submarine landslide. a b m.

13 Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. Fig. a Anaglyph image around continental slope off Kushiro top. b Bathymetric map with names of submarine topography around continental slope off Kushiro bottom. Contour interval is m. Red line: reverse fault, black line: normal fault, broken line: inferred fault. a b m.

14 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity m HK- 5.6 厚岸沖の陸棚外縁斜面の海底地形 Fig. a Fig. b m km m m m km 5.7 襟裳岬沖の海底地形 Fig. a Fig. b m m m m km m 6 千島海溝南西部の海底活断層と地震

15 Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. Fig. a Anaglyph image around continental shelf off Akkeshi top. b Bathymetric map with names of submarine topography around continental shelf off Akkeshi bottom. Contour interval is m. Red line: reverse fault, black line: normal fault, broken line: inferred fault. a b m.

16 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity Fig. a Anaglyph image around the area off Cape Erimo top. b Bathymetric map with names of submarine topography around the area off Cape Erimo bottom. Contour interval is m. Red line: reverse fault, broken line: inferred fault, brown line: crown of large submarine landslide. a b m.

17 Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. 6.1 海底活断層の特徴 Fig. a Fig. b m m km m m k- m km m km DEM

18 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity m m m m hk- S 6.2 海底活断層と地震 M Fukao and Furumoto Yamanaka and Kikuchi,

19 Noriaki IZUMI, Azusa NISHIZAWA, Daishi HORIUCHI et al. 7 おわりに謝辞文献 Fujiwara, T., S. Kodaira, T. No, Y. Kaiho, N. Takahashi, and Y. Kaneda The Tohoku-Oki earthquake: Displacement reaching the trench axis, Science,,, doi:. /science.. Fukao,Y. and M. Furumoto Stress drops, wave spectra and recurrence intervals of great earthquakes implications of the Etorofu earthquake of, November, Geophys. J. Roy. Astron. Soc.,,..... DEM D,. mdem D. m DEM D,. DEM D,. m DEM D,. D. chousa/ dec_chishima /chishima.pdf..

20 3D bathymetric image of the southwestern part of the Kuril Trench and its vicinity jamstec-j/ifree_center/.. japan m.grd KY JAMSTEC.. KR - Cruise Report data/doc_catalog/media/kr - _all.pdf... SeaBeam Blue Earth Tsuru, T., J.-O. Park, Y. Kido, A. Ito, Y. Kaneda, T. Yamada, M. Shinohara, and T. Kanazawa Did expanded porous patches guide rupture propagation in Tokachi-oki earthquake?, Geophys. Res. Lett.,, L, doi:. / GL. Yamanaka, Y. and M. Kikuchi, Source process of the recurrent Tokachi-oki earthquake on September,, inferred from teleseismic body waves, Earth Planets Space,, e -e. 要旨 JAMSTEC mdem Digital Elevation Model DEM

21 Fig. a Anaglyph image of the study area. a

22 Fig. b Distribution of submarine active faults in the study area. Contour interval is m. Red line: reverse fault, black line: normal fault, broken line: inferred fault, brown line: crown of large submarine landslide. b m

140-【技術報告】泉.indd

140-【技術報告】泉.indd 技術報告 REPORT OF HYDROGRAPHIC AND OCEANOGRAPHIC RESEARCHES No.52 March, 2015 m DEM D 3D bathymetric image of the Izu Ogasawara Trench and its vicinity based on 150 m grid DEM Noriaki IZUMI, Azusa NISHIZAWA,