Detectability analysis of interplate fault slips in the Nankai subduction thrust using seafloor observation instruments

  • Ryoichiro AgataEmail author
  • Takane Hori
  • Keisuke Ariyoshi
  • Tsuyoshi Ichimura
Original Research Paper


To help the decision making regarding where to locate new observation instruments on the seafloor, we examined the detectability of interplate earthquakes and slow slips in the Nankai subduction thrust in Japan using seafloor observation instruments. Here, the detectability is defined as the smallest magnitude of the interplate fault slip detected by the assumed observation points based on crustal deformation simulation. In the detectability analyses, we considered the effect of sensor drifts that are particularly associated with seafloor observations. In addition, we introduced high-resolution three-dimensional (3D) finite element modeling of crustal deformation to consider the effect of the topography and 3D heterogeneous crustal structure around the Nankai Trough. The results of the detectability analyses show that introducing new seafloor stations for tilt observation in the Nankai region should increase the detectability of small- or medium-sized interplate earthquakes and slow slips significantly. Based on the obtained results, we also discuss the advantage of both the existing and the new observation instruments in detecting interplate fault slips.


Slow slips Detectability analysis Seafloor observation instruments Tilt observation Ocean bottom pressure gauge DONET Finite element analysis Crustal deformation 



Part of the results were obtained using the K computer at the RIKEN Advanced Institute for Computational Science (Proposal No.: hp170249 and hp180207). This work was supported by Post K computer project (Priority issue 3: development of integrated Simulation Systems for Hazard and Disaster Induced by Earthquake and Tsunami).


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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.R&D Center for Earthquake and Tsunami Planning and Coordination Group, Japan Agency for Marine-Earth Science and TechnologyYokohamaJapan
  2. 2.Earthquake Research Institute, The University of TokyoTokyoJapan
  3. 3.Center for Computational Science, RIKENKobeJapan
  4. 4.Center for Advanced Intelligence Project, RIKENTokyoJapan

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