Japan Geoscience Union Meeting 2025

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT39] Brand-new scope of coupling geophysics being established by infrasound and associated waves

Wed. May 28, 2025 9:00 AM - 10:30 AM 104 (International Conference Hall, Makuhari Messe)

convener:Masa-yuki Yamamoto(Department of systems engineering, Kochi University of Technology), Yasuhiro Nishikawa(Division of Math, Sciences, and Information Technology in Education, Environment and Safety Sciences Course Osaka Kyoiku University), Mie Ichihara(Earthquake Research Institute, University of Tokyo), Takayuki Otsu(Japan Weather Association), Chairperson:Yasuhiro Nishikawa(Kochi University of technology. School of System Engineering.), Hiroaki Saito(Cosmosciences, Hokkaido University)

9:00 AM - 9:15 AM

[MTT39-01] Large-Scale Numerical Simulation of Tsunami-Induced Atmospheric Pressure Waves Using a 3-D Spherical Coordinate System Based on Finite-Difference Time-Domain Method

★Invited Papers

*Kan Okubo1, Masami Tokuda1, Yoshiki Saito1, Kyosuke Sato1 (1.Faculty of system design, TOKYO METROPOLITAN UNIVERSITY)

Keywords:Tsunami-Induced, Atmospheric Pressure Waves, Spherical Coordinate System, FDTD, tsunami source estimation

Japan is located in a seismically active region with multiple plate boundaries, making the advancement of early tsunami detection technologies essential. Our research group has previously developed an inversion method for tsunami source estimation utilizing atmospheric pressure fluctuations (Atmospheric Pressure Waves) generated by tsunamis. Conventionally, three-dimensional numerical simulations of atmospheric pressure waves over regions of Japan’s maritime domain employ a Cartesian coordinate system with a planar approximation. However, the validity of this approximation over different spatial scales has not been thoroughly examined.
To enhance the robustness of tsunami source estimation using atmospheric pressure waves, this study implements a large-scale numerical simulation of tsunami-induced atmospheric pressure wave propagation based on the finite-difference time-domain (FDTD) method in a three-dimensional spherical coordinate system. Furthermore, we compare and evaluate the results with those obtained from conventional Cartesian coordinate-based simulations to assess the validity of the planar approximation.