Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS24] Integrated Analysis of Geoscience Observations from the Floor to Surface of the Ocean

Sun. May 26, 2019 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Keisuke Ariyoshi(Japan Agency for Marine-Earth Science and Technology), Motoyuki Kido(International Research Institute for Disaster Science, Tohoku University), Daisuke Inazu(Tokyo University of Marine Science and Technology), Narumi Takahashi(National Research Institute for Earth Science and Disaster Resilience)

[MIS24-P01] A simultaneous observation from seafloor to atmosphere by using “Chikyu” and DONET

*Keisuke Ariyoshi1, Takeshi Iinuma1, Shuhei Nishida1, Yuya Machida1, Yasumasa Miyazawa1, Toru Miyama1, Hiroshi Uchida1, Akira Nagano1, Masahide Wakita1, Mikiko Fujita1, Tatsu Kuwatani1, Amane Fujiwara1, Katsunori Kimoto1, Yoshiyuki Nakano1, Yoshimi Kawai1, Kaoru Ichikawa2, Takuya Hasegawa5, Akira Kuwano-Yoshida3, Akiko Toh4 (1.Japan Agency for Marine-Earth Science and Technology, 2.Kyusyu University, 3.Kyoto University, 4.The University of Tokyo, 5.Tohoku University)

Keywords:subduction zone, megathrust earthquake, ocean current

Slow earthquake [1] including very low-frequency earthquake migrates along strike direction at depth about 30 km, which has been detected from inland seismic observation networks [2]. This migration of slow earthquake is thought to occur in the shallower part near the trench [3], which would be important to monitor the generation process of megathrust earthquakes, in order to classify hydraulic pressure change on the sea bottom into crustal deformation and oceanic oscillation. Toward the monitoring, we have conducted simultaneous observations from seafloor to atmosphere by using DONET and Scientific Deep Sea Drilling Vessel “Chikyu”. In our presentation, we will introduce our observations and collaboration with other related observational campaigns.

References [1] S. Ide et al., Nature 447, 76-79 (2007). [2] K. Obara & S. Sekine, Earth Planets Space 61, 853-862 (2009). [3] S.Y. Schwartz & J.M. Rokosky, Rev. Geophys. 45, RC3004 (2007).