[S-SS02] Frontier studies on subduction zone megathrust earthquakes and tsunamis

Mon. May 25, 2015 4:15 PM - 6:00 PM IC (2F)

Convener:*Kyuichi Kanagawa(Graduate School of Science, Chiba University), Demian Saffer(Dept. of Geosciences, The Pennsylvania State University, USA), Michael Strasser(Geological Institute, Seiss Federal Insitute of Technology ETH Zurich), Yasuhiro Yamada(Depertment of Urban Management Engineering, Kyoto University), Shuichi Kodaira(Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology), Ryota Hino(International Research Institute of Disaster Science, Tohoku University), Kohtaro Ujiie(Graduate School of Life and Environmental Sciences, University of Tsukuba), Yoshihiro Ito(Disaster Prevention Research Institute, Kyoto University), Chair:Kohtaro Ujiie(Graduate School of Life and Environmental Sciences, University of Tsukuba), Kyuichi Kanagawa(Graduate School of Science, Chiba University)

Subduction zone megathrust earthquakes and their accompanying tsunamis, such as the Tohoku-oki earthquake on March 11 in 2011, have caused severe damage in the past. Scientists have worked for decades to understand these devastating events, mostly based on seismic, tsunami and geodetic observations. In addition to these remote monitoring studies, the challenge of drilling into and directly sampling megathrust faults at seismogenic depth, analysis of drill core and downhole logs, experiments on sampled fault materials, and borehole measurements at depth has recently been taken up or being planned by the Integrated Ocean Drilling or International Ocean Discovery Program at Nankai Trough (Nankai Trough Seismogenic Zone Experiment), Japan Trench (Japan Trench Fast Drilling Project and Tracking Tsunamigenic Slips in the Japan Trench), offshore Costa Rica (Costa Rica Seismogenesis Project), and at the Hikurangi margin. In this session, we welcome presentations based on such frontier studies, in addition to those based on seismic, tsunami and geodetic observations, numerical modeling, and analyses of fault rocks exhumed from seismogenic depth.

+Add all to schedule

4:15 PM - 4:35 PM

★ [SSS02-20] Unlocking the secrets of slow slip at the Hikurangi subduction margin

*Laura WALLACE¹, Demian SAFFER², Yoshihiro ITO³, Stuart HENRYS⁴, Philip BARNES⁵, Kimihiro MOCHIZUKI⁶, Joshu MOUNTJOY⁵, Stephen BANNISTER⁴, Michael UNDERWOOD⁷, Shuichi KODAIRA⁸, Rob HARRIS⁹ (1.University of Texas, Institute for Geophysics, 2.Pennsylvania State University, 3.Kyoto University, 4.GNS Science, New Zealand, 5.NIWA, New Zealand, 6.University of Tokyo, ERI, 7.University of Missouri, 8.JAMSTEC, 9.Oregon State University)

4:35 PM - 4:50 PM

[SSS02-21] Physical property and Microstructure across the Seismic reflectors in the Upper plate of the Costa Rica Subduction zone

*Mari HAMAHASHI¹, Elizabeth SCREATON², Wataru TANIKAWA³, Yoshitaka HASHIMOTO⁴, Kylara MARTIN⁵, Saneatsu SAITO³, Gaku KIMURA¹ (1.The University of Tokyo, 2.University of Florida, 3.Japan Agency for Marine-Earth Science and Technology, 4.Kochi University, 5.U.S. Naval Research Laboratory)

4:50 PM - 5:05 PM

[SSS02-22] Rupture process of the 2014 Iquique, Chile earthquake estimated from tsunami waveforms, teleseismic, and GPS data

*Aditya GUSMAN¹, Satoko MUROTANI¹, Kenji SATAKE¹, Mohammad HEIDARZADEH¹, Shingo WATADA¹, Endra GUNAWAN², Bernd SCHURR³ (1.Earthquake Research Institute, the University of Tokyo, 2.Graduate School of Environmental Studies, Nagoya University, 3.GFZ Helmholtz Centre Potsdam, German Research Centre for Geosciences)

5:05 PM - 5:20 PM

[SSS02-23] Tsunami Hazards from secondary sources in the Makran Subduction Zone, northwestern Indian Ocean

*Mohammad HEIDARZADEH¹, Kenji SATAKE¹ (1.Earthquake Research Institute, The University of Tokyo)

5:20 PM - 5:35 PM

[SSS02-24] Microfault classification and difference in roughness with seismic cycles exampled from the Chelung-pu fault, Taiwan

*Yoshitaka HASHIMOTO¹, Shohei KISHI¹, Kota TOBE¹, En-chao YEH², Weiren LIN³, Wan-chung LU⁴ (1.Kochi Univsrity, 2.National Taiwan Normal University, 3.JAMSTEC Kochi, 4.Taiwan Central Geological Survey)

5:35 PM - 5:50 PM

[SSS02-25] Dynamic weakening of smectite-bearing faults at subseismic slip rates

*Kiyokazu OOHASHI¹, Takehiro HIROSE², Miki TAKAHASHI³, Wataru TANIKAWA² (1.Graduate School of Science and Engineering, Yamaguchi University, 2.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 3.Institute of Earthquake and Volcano Geology, Geological Survey of Japan, AIST)

5:50 PM - 5:53 PM

[SSS02-P07] Borehole stability discussion of NanTroSEIZE main-site, C0002

3-min talk in an oral session

*Hungyu WU¹, Yoshinori SANADA¹, Masataka KINOSHITA¹, Kyaw MOE¹ (1.Japan Agency for Marine-Earth Science and Technology)

5:53 PM - 5:56 PM

[SSS02-P09] Change in stress state in an on-land accretionary complex : implication for large stress drop with subduction earthquake

3-min talk in an oral session

*Yoshitaka HASHIMOTO¹, Dai UEDA¹, Yuhei MOTOMIYA¹, Kohtaro UJIIE² (1.Kochi University, 2.Tsukuba University)

5:56 PM - 5:59 PM

[SSS02-P10] Coseismic stress of ancient seismic fault of Median Tectonic Line at Mie Matsusaka, Japan

3-min talk in an oral session

*Yusuke KOMETANI¹, Norio SHIGEMATSU², Arito SAKAGUCHI³ (1.Yamaguchi University Graduate School of Science and Engineering, Yamaguchi University, 2.ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY(AIST), 3.Yamaguchi University Graduate School of Science and Engineering, Yamaguchi University)

Session information

[S-SS02] Frontier studies on subduction zone megathrust earthquakes and tsunamis

★ [SSS02-20] Unlocking the secrets of slow slip at the Hikurangi subduction margin

3-min talk in an oral session

3-min talk in an oral session

3-min talk in an oral session