[S-CG67] Ocean area observation to detect crustal activity under the seafloor: Present and future

Thu. May 24, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Kazuro Hirahara(Department of Geophysics, Earth and Planetary Sciences, Graduate School of Sciences, Kyoto University), Ryota Hino(Graduate School of Science, Tohoku University), Takane Hori(独立行政法人海洋研究開発機構・地震津波海域観測研究開発センター)

Recent progress of seafloor observations for earthquake and crustal deformation, such as deployment of submarine cable networks of S-net and DONET, and repeated observations of GNSS/A and acoustic extensometer (direct path acoustic ranging ), enable us to evaluate on-going crustal activities in the megathrust regions along the Japan trench and the Nankai trough. We review the present status and the future plans of such seafloor observations, and discuss the future directions of seafloor observation networks, especially for real-time monitoring of crustal activities. Toward these directions, we welcome papers introducing the present status of novel approaches and systems such as optical fiber, laser ranging or seafloor SAR and real-time geodetic observations using mooring buoys or wave glider, and so on. We also welcome future plans to integrate observation for the crustal activity under the seafloor with observation for ocean and climate changes.

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[SCG67-P01] Practical method to determine relative orientation of horizontal components of ocean bottom seismometer in an array

*Shukei Ohyanagi¹, Kazuaki Ohta², Yoshihiro Ito², Ryota Hino³, Yusaku Ohta³, Ryosuke Azuma³, Masanao Shinohara⁴, Kimihiro Mochizuki⁴, Toshinori Sato⁵, Yoshio Murai⁶ (1.Graduate School of Science, Kyoto University, 2.Disaster Prevention Research Institute, Kyoto University, 3.Tohoku University, 4.Earthquake Research Institute, University of Tokyo, 5.Chiba University, 6.Hokkaido University)

[SCG67-P02] Array positioning analysis of GPS-Acoustic observation data considering lateral gradient of the sound speed in seawater

*Chie Honsho¹, Motoyuki Kido², Fumiaki Tomita¹ (1.Graduate School of Science, Tohoku Univ., 2.IRIDeS, Tohoku Univ.)

[SCG67-P03] Spatially non-linear property of sound speed structure in GPS-acoustic measurement

*Ryo Matsui¹, Motoyuki Kido², Chie Honsho¹, Fumiaki Tomita¹ (1.Graduate School of Science, Tohoku University, 2.International Research Institute for Disaster Science, Tohoku University)

[SCG67-P04] Long-term monitoring of vertical temperature gradient of seawater on the deep seafloor

*Syuichi Suzuki¹, Ryota Hino¹, Makiko Sato¹, Yoshihiro Ito², Tatsuya Kubota³, Daisuke Inazu⁴ (1.Graduate School of Science, Tohoku University, 2.Disaster Prevention Reserch Institute, Kyoto University, 3.National Reserch Institute for Earth Science and Disaster Resilience , 4.Tokyo University of Marine Science and Technology)

[SCG67-P05] Detection of postseismic slip after the 2011 Tohoku Earthquake by means of direct path acoustic ranging (DPR)

*Ryusuke Yamamoto¹, Ryota Hino¹, Motoyuki Kido², Yukihito Osada^1,3, Chie Honsho¹, Syuichi Suzuki¹ (1.Graduate School of Science, Tohoku University, 2.International Research Institute of Disaster Science, Tohoku University, 3.GNSS Technologies, Inc.)

[SCG67-P06] Development of acoustic signal processing unit for continuous observation of ocean bottom crustal deformation using marine GNSS buoy

*Natsuki Kinugasa¹, Keiichi Tadokoro¹, Shun Inagaki¹, Yukihiro Terada³, Akira Futamura⁴, Teruyuki Kato² (1.Graduate School of Environmental Studies, Nagoya University, 2.Earthquake Research Institute, the University of Tokyo, 3.National Institute of Technology, Kochi College, 4.National Institute of Technology, Yuge College)

[SCG67-P07] Geodesy and broadband seismology from a mobile ocean bottom observation

*Hajime Shiobara¹, Aki Ito², Hiroko Sugioka³, Masanao Shinohara¹ (1.ERI, Univ. of Tokyo, 2.JAMSTEC, 3.Kobe Univ.)

[SCG67-P08] Reducing and correcting long-term drift of pressure sensors used for ocean bottom pressure measurements

*Hiroaki Kajikawa¹, Tokihiko Kobata¹ (1.National Institute of Advanced Industrial Science and Technology)

[SCG67-P09] Mobile pressure calibrator for ocean bottom pressure gauge of the DONET, Part1: Development of the pressure measurement unit

*Yuya Machida¹, Shuhei Nishida¹, Eiichiro Araki¹ (1.Japan Agency for Marine-Earth Science and Technology)

[SCG67-P10] Mobile pressure calibrator for ocean bottom pressure gauge of the DONET
Part 2: Development of level adjustment Unit

*Shuhei Nishida¹, Yuya Machida¹, Eiichiro Araki¹ (1.Japan Agency for Marine-Earth Science and Technology)

[SCG67-P11] Vibration table test simulating the installation environments of the cabled ocean bottom seismometer deployed to DONET and S-net

*Kensuke Suzuki¹, Eiichiro Araki¹, Masahiro Korenaga², Shunroku Yamamoto², Takeshi Nakamura³, Narumi Takahashi³ (1.JAMSTEC, 2.RTRI, 3.NIED)

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