Solid Earth Sciences(S)
Session Sub-categoryComplex & General
Session IDS-CG67
TitleOcean area observation to detect crustal activity under the seafloor: Present and future
Short TitleSeafloor crustal activity observation
Main ConvenerNameKazuro Hirahara
AffiliationDepartment of Geophysics, Earth and Planetary Sciences, Graduate School of Sciences, Kyoto University
Co-Convener 1NameRyota Hino
AffiliationGraduate School of Science, Tohoku University
Co-Convener 2NameTakane Hori
AffiliationR&D Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology
Session LanguageJJ
ScopeRecent 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.
Presentation FormatOral and Poster presentation
Invited Authors
  • Shin Aoi (National Research Institute for Earth Science and Disaster Resilience)
  • Tadashi Ishikawa (Hydrographic and Oceanographic Department, Japan Coast Guard)
  • Teruyuki Kato (Earthquake Research Institute, The University of Tokyo)
  • YOSHIHITO TANAKA (Chubu Electric Power Co., Inc.)
Time Presentation No Title Presenter Abstract
Oral Presentation May 24 PM1
13:45 - 14:00 SCG67-01NIED Observation Network for Earthquake, Tsunami and Volcano: MOWLASShin Aoi Abstract
14:00 - 14:15 SCG67-02Recent progress in the GNSS-A seafloor geodetic observation: A review and outlookTadashi Ishikawa Abstract
14:15 - 14:30 SCG67-03Current status of high-precision onshore observation on the sea: Zenisu reef GPS campaign observationTakao Tabei Abstract
14:30 - 14:45 SCG67-04Interplate coupling and strain partitioning along the Nankai Trough estimated from GNSS and GPS-A dataTakuya NISHIMURA Abstract
14:45 - 15:00 SCG67-05Present status and future scope of the GNSS buoy array project for synthetic disaster mitigationTeruyuki Kato Abstract
15:00 - 15:15 SCG67-06Development of observation system for ocean bottom crustal deformation measurement utilizing marine GNSS buoyKeiichi Tadokoro Abstract
Oral Presentation May 24 PM2
15:30 - 15:45 SCG67-07Technical developments for continuous seafloor deformation monitoring of seismically coupled plate interface in the Nankai Trough.Eiichiro Araki Abstract
15:45 - 16:00 SCG67-08Compact long-term broadband ocean bottom seismometer for slow earthquakes observationMasanao Shinohara Abstract
16:00 - 16:15 SCG67-09Evaluation of long-term drift characteristic of the OBP based on the laboratory experiment with the high accuracy reference pressure balance and apply it to the actual observation dataYui Nishimagi Abstract
16:15 - 16:30 SCG67-10Real-time use of ocean-floor data for disaster resilienceNarumi Takahashi Abstract
16:30 - 16:45 SCG67-11Development of a Tsunami Observation and Prediction System at Hamaoka NPS :
Performance Evaluation and Tsunami Prediction on Oceanographic Radar
16:45 - 17:00 SCG67-12Discussion on ocean area observation to detect crustal activity under the seafloor: Present and futureTakane Hori Abstract
Presentation No Title Presenter Abstract
Poster Presentation May 24 Core Time
SCG67-P01 Practical method to determine relative orientation of horizontal components of ocean bottom seismometer in an array Shukei Ohyanagi Abstract
SCG67-P02 Array positioning analysis of GPS-Acoustic observation data considering lateral gradient of the sound speed in seawater Chie Honsho Abstract
SCG67-P03 Spatially non-linear property of sound speed structure in GPS-acoustic measurement Ryo Matsui Abstract
SCG67-P04 Long-term monitoring of vertical temperature gradient of seawater on the deep seafloor Syuichi Suzuki Abstract
SCG67-P05 Detection of postseismic slip after the 2011 Tohoku Earthquake by means of direct path acoustic ranging (DPR) Ryusuke Yamamoto Abstract
SCG67-P06 Development of acoustic signal processing unit for continuous observation of ocean bottom crustal deformation using marine GNSS buoy Natsuki Kinugasa Abstract
SCG67-P07 Geodesy and broadband seismology from a mobile ocean bottom observation Hajime Shiobara Abstract
SCG67-P08 Reducing and correcting long-term drift of pressure sensors used for ocean bottom pressure measurements Hiroaki Kajikawa Abstract
SCG67-P09 Mobile pressure calibrator for ocean bottom pressure gauge of the DONET, Part1: Development of the pressure measurement unit Yuya Machida Abstract
SCG67-P10 Mobile pressure calibrator for ocean bottom pressure gauge of the DONET
Part 2: Development of level adjustment Unit
Shuhei Nishida Abstract
SCG67-P11 Vibration table test simulating the installation environments of the cabled ocean bottom seismometer deployed to DONET and S-net Kensuke Suzuki Abstract