第24回応用力学シンポジウム

Presentation information

General Session (5.応用数理問題―計算機科学から社会科学まで)

第五部門:応用数理問題(A)

Sat. May 15, 2021 9:00 AM - 10:30 AM E (E)

座長:本田 利器(東京大学)

10:15 AM - 10:30 AM

[S05A-06] Sensitivity analysis for seafloor geodetic constraints on the fault state with high-fidelity 3D crustal structure model

*Sota Murakami1, Tsuyoshi Ichimura1, Kohei Fujita1, Takane Hori2, Yusaku Ohta3 (1. Earthquake Research Institute, The University of Tokyo, 2. R&D Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, 3. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University)

Keywords:seafloor observation, inversion of fault slip, sensitivity analysis, crustal deformation, finite element analysis

The seafloor crustal deformation observation on the seismogenic zone is expected to play a major role in estimating the fault state.To check its effectiveness, we propose a method to quantitatively evaluate the estimation accuracy.A highly reliable Green's function that reflect a high-fidelity crustal structure is calculated by finite element method.By performing many inversions, we evaluate the effect of increase in the number of observation points and the effect of measurement error.As an application example of the Kuril Trench, it is demonstrated that observation of seafloor crustal deformation plays a major role in the estimation performance.