第五部門：応用数理問題（A)

[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.