Juichiro ASHI (Assoc. Professor)

Speciality: Marine geology



Tokuyama, H., Ashi, J., Soh, W., Kuramoto, S. and Ikeda, Y., 1999. Active Submarine Faults off Tokai - Results from the Japan-France KAIKO-Tokai Project. University of Tokyo Press, pp 174.

Taira, A., Byrne, T. and Ashi, J., 1992. Photographic Atlas of an Accretionary Prism: Geologic Structures of the Shimanto Belt, Japan. University of Tokyo Press, pp 124.


Kioka, A., J. Ashi, A. Sakaguchi, T. Sato, S. Muraoka, A. Yamaguchi, H. Hamamoto, K. Wang and H. Tokuyama, Possible mechanism of mud volcanism at the prism-backstop contact in the western Mediterranean Ridge Accretionary Complex, Marine Geology, in press.

Otsuka, H., S. Morita, M. Tanahashi and J. Ashi, Foldback reflectors near methane hydrate bottom-simulating reflectors: Indicators of gas distribution from 3D seismic images in the eastern Nankai Trough, Island Arc, in press.

Ashi, J., R. Sawada, A. Omura and K. Ikehara, Accumulation of an earthquake-induced extremely turbid layer in a terminal basin of the Nankai accretionary prism, Earth, Planets and Space, 66:51 (12 Jun 2014) doi:10.1186/1880-5981-66-51, 2014.

Ikehara, K., T. Irino, K. Usami, R. Jenkins, A., Omura and J. Ashi, Possible submarine tsunami deposits on the outer shelf of Sendai Bay, Japan resulting from the 2011 earthquake and tsunami off the Pacific coast of Tohoku, Marine Geology, 358, 120-127, doi:10.1016/j.margeo.2014.11.004, 2014.

Tsuji, T., J. Ashi and Y. Ikeda, Strike-slip motion of a mega-splay fault system in the Nankai oblique subduction zone, Earth, Planets and Space, 66:120 (19 Sep 2014), doi:10.1186/1880-5981-66-120, 2014.

Toki, T., R. Higa, A. Ijiri, U. Tsunogai and J. Ashi, Origin and transport of pore fluids in the Nankai accretionary prism inferred from chemical and isotopic compositions of pore water at cold seep sites off Kumano, Earth, Planets and Space, 66:137 (24 Oct 2014), doi:10.1186/s40623-014-0137-3, 2014.

Koge, H., T. Fujiwara, S. Kodaira, T. Sasaki, J. Kameda, Y. Kitamura, M. Hamahashi,  R. Fukuchi, A. Yamaguchi, Y. Hamada, J. Ashi and G. Kimura, Friction properties of the plate boundary megathrust beneath the frontal wedge near the Japan Trench: an inference from topographic variation, Earth, Planets and Space, 66:153 (19 Nov 2014), doi:10.1186/s40623-014-0153-3, 2014.

Misawa, A., K. Hirata, L. Seeber, K. Arai , Y. Nakamura, R. Rahardiawan, Udrekh, T. Fujiwara, M. Kinoshita, H. Baba, K.  Kameo, K. Adachi, H. Sarukawa, H. Tokuyama, H. Permana, Y. S. Djajadihardja, J. Ashi, Geological structures of the Offshore Sumatra forearc region from High-Resolution MCS reflection survey, Earth Planet. Sci. Lett., 386, 41-51, doi:10.1016/j.epsl.2013.10.031, 2013.

Ito, Y., R. Hino, M. Kido, H. Fujimoto, Y. Osada, D. Inazu, Y. Ohta, T. Iinuma, M. Ohzono, S. Miura, M. Mishina, K. Suzuki, T. Tsuji and J. Ashi, Episodic slow slip events in the Japan subduction zone before the 2011 Tohoku-Oki earthquake, Tectonophysics, 600, 14-26, 2013.

Tsunogai, U., K. Maegawa, S. Sato, D. Komatsu, F. Nakagawa, T. Toki and J. Ashi, Coseimic massive methane release from a submarine mud volcano, Earth Planet. Sci. Lett., 341-344, 79?85, 2012.

Nunoura, T., Y. Takaki, H. Kazama, M. Hirai, J. Ashi, H. Imachi and K. Takai, Microbial Diversity in Deep-sea Methane Seep Sediments Presented by SSU rRNA Gene Tag Sequencing, Microbes Environ., 27, 382-390, 2012.

Omura,A. , K. Ikehara,K, T. Sugai, M. Shirai and J. Ashi, Determination of the origin and processes of depositon of deep-sea sediments from the composition of contained organic matter: an example from two forearc basins on the landward flank of the Nankai Trough, Japan. Sedimentary Geol., 249-250, 10-25, 2012.

Ikehara, K., J. Ashi, H. Machiyama and M. Shirai, Submarine slope response to earthquake shaking within western Sagami Bay, Central Japan, In: Yamada Y. et al (Eds), Submarine Mass Movements and Their Consequences. Advances in Natural and Technological Hazards Research, Springer, 31, 539-547, 2012.

Ashi, J., K. Ikehara and M. Kinoshita and KY04-11 and KH-10-3 shipboard scientists, Settling of Earthquake-Induced Turbidity on the Accretionary Prism Slope of the Central Nankai Subduction Zone, In: Yamada Y. et al (Eds), Submarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research, Springer, 31, 561-571, 2012.

Tonai, S., S. Sato and J. Ashi, Incremental fold test for paleostress analysis using the Hough transform inverse method, Jour. Struct. Geology, 33, 1158-1168, 2011.

Tsuji, T., Y. Ito, M. Kido, Y. Osada, H. Fujimoto, J. Ashi, M. Kinoshita, and T. Matsuoka, Potential Tsunamigenic Fault of the 2011 Off-Tohoku Earthquake, Earth Planet Space, 63, 831-834, 2011.

Tonai, S., Y. Suganuma, J. Ashi and T. Itaya, Differential timing of vertical-axis block rotations in the northern Ryukyu Arc: Paleomagnetic evidence from the Koshikijima Islands, Japan, Tectonophysics, 497, 71-84 2011.

Toki, T., K. Maegawa, U., Tsunogai, S., Kawagucci, N., Takahata, Y., Sano, J. Ashi, M., Kinoshita and T. Gamo, Gas chemistry of pore fluids from Oomine Ridge on the Nankai accretionary prism, in Dilek, Y., Ogawa, Y., Anma, R., Kinoshita, M., and Matsumoto, R., eds., Convergent margin tectonics by submersible study in the Northwest Pacific Basin, Springer, 8, 247-262, 2011.

Nakayama, N, J. Ashi, U. Tsunogai, T. Gamo and M. Tanahashi, Sources of pore water in a Tanegashima mud volcano inferred from chemical and stable isotopic studies, Geochemical Jour., 44, 561-569, 2010.

Martin, K. M., S. Gulick, N. Bangs, G. F. Moore, J. Ashi, J.-O. Park, S. Kuramoto and A. Taira, Possible strain partitioning structure between the Kumano fore-arc basin and the slope of the Nankai Trough accretionary prism, Geochem.Geophys.Geosyst., 11, Q0AD02, doi:10.1029/2009GC002668, 2010.

Gulick, S., N. Bangs, G. F. Moore, J. Ashi, K. Martin, D. Sawyer, H. Tobin, S. Kuramoto, and A. Taira, Rapid forearc basin uplift and megasplay fault development from 3D seismic images of Nankai margin off Kii Peninsula, Japan, Earth Planet. Sci. Lett., 300, 55-62, 2010.

Miyazaki, J., R. Higa, T. Toki, J. Ashi, U. Tsunogai, T. Nunoura, H. Imachi and K. Takai, Molecular characterization of potential nitrogen fixation by anaerobic methane oxidizing archaea in the methane-seep sediments at the No. 8 Kumano Knoll in the Kumano Basin, off shore of Japan, Appl. Environ. Microbiol., 75, 7153-7162, 2009.

Tobin,T., M. Kinoshita, J. Ashi,S. Lallemant,G. Kimura,E.J. Screaton,Moe Kyaw Thu, H. Masago, D. Curewitz. and the Expedition 314/315/316, Scientists,NanTroSEIZE Stage 1 expeditions: introduction and synthesis of key results, Proceedings of the Integrated Ocean Drilling Program, 315, 2009.

Ashi, J., S. Lallemant, H. Masago and the Expedition 315 Scientists, NanTroSEIZE Stage 1A: NanTroSEIZE megasplay riser pilot, IODP Preliminary Report, 315,1-55, 2008.

Ashi, J., S. Lallemant and H. Masago, NanTroSEIZE Stage 1: NanTroSEIZE megasplay riser pilot, IODP Scientific Prospectus, 315,1-78, 2007.

Nunoura, T., H. Oida, T. Toki, J. Ashi, K. Takai, K. and K. Horikoshi, Quantification of mcrA by quantitative fluorescent PCR in sediments from methane seep of the Nankai Trough, FEMS Microbiology Ecology, 87, 146-157, 2006.

Martin V., Henry P., Nouze H., Noble M., Ashi J., Pascal G., 2004, Erosion and sedimentation as processes controlling the BSR-derived heat flow on the Eastern Nankai margin. Earth Planet. Sci. Lett., 222 (1), 131-144.

Ashi, J., H. Tokuyama and A. Taira, 2002. Distribution of methane hydrate BSRs and its implication for the prism growth in the Nankai Trough, Marine Geology, 187, 177-191.

Kuramoto, S., Ashi, J. and the shipboard scientific party, Surface observations of subduction related mud volcanoes and large thrust sheets in the Nankai subduction margins; Reports on YK00-10 and YK01-04 cruise, JAMSTEC J. Deep Sea Res., 19, 131-139 (2001).

Ashi, J., 1999. Large submarine landslides associated with decomposition of gas hydrate, Landslide News, 12, 17-20.

Ashi, J., 1997. Distribution of cold seepage at the fault scarp of the eastern Nankai accretionary prism, JAMSTEC J. Deep Sea Res., 13, 495-501.

Ashi, J., 1997, Computed tomography scan image analysis of sediments, Proc. ODP, Sci. Results 156, 151-159.

Ashi, J., Segawa, J., Le Pichon, X., Lallemant, S., Kobayashi, K., Hattori, M., Mazzotti S. and Aoike K., 1996. Distribution of cold seepage at the Ryuyo Canyon off Tokai: the 1995 KAIKO-Tokai Shinkai 200" Dives", JAMSTEC J. Deep Sea Res., 12, 159-166.

Okutani, T., Kojima S. and Ashi, J., 1996. An unusual Vesicomyid bivalve, Calyptogena nankaiensis n. sp. from bathyal depth off Honshu, Japan, VENUS. 55, 257-263.

Ashi, J., 1995. CT scan analysis of sediments from ODP Leg 146, Proc. ODP, Sci. Results 146, 191-199.

Ashi, J. and Taira, A., 1993. Thermal structure of the Nankai Accretionary Prism as inferred from the distribution of gas hydrate BSRs: Geological Society of America Special Paper 273, 137-149.

Taira, A., and Ashi, J., 1993. Sedimentary facies evolution of the Nankai forearc and its implications for the growth of the Shimanto accretionary prism, Proc. ODP, Sci. Results 131, 331-341.

Ashi, J., and Taira, A., 1992. Structures of the Nankai accretionary prism as revealed from IZANAGI sidescan imagery and multichannel seismic reflection profiling. The Island Arc 1, 104-115.

Ogawa, Y., Ashi, J. and K. Fujioka, 1992, Vein structures and their tectonic implications for the development of the Izu-Bonin forearc, Leg 126 , Proc. ODP, Sci. Results 126, 195-207.

Kobayashi, K., Ashi, J., Boulegue, J., Cambray, H. et al., 1992. Deep-tow survey in the KAIKO Nankai cold seepage areas, Earth Planet. Sci. Lett. 109, 347-354.

Taira, A., Ashi, J., Kuramoto, S., Tokuyama, H., and Soh, W., 1990. Accretion versus erosion in forearc tectonics - A case study from the Nankai Trough and the Japan Trench. Marine Geology in Asia, 39-53.

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