Session V:
Assimilation of geodetic date and seismic activity data into simukation models

2nd ACES (APEC Cooperation for Earthquake Simulation) Workshop in Japan

Viscoelastic Inversion of Crustal Deformation Data
Takeshi Sagiya, Toshinori Sato, Chihiro Hashimoto, Kazuo Minami, Mitsuhiro Matsu'ura


We developed a new geodetic inversion method. The method is formulated for a 3-dimensional layered half space with elastic or Maxwell viscoelastic rheology. We can estimate spatio-temporal slip distribution on a fault surface with an arbitrary configuration based on time-dependent geodetic data such as GPS. With this method, we can deduce both stepwise coseismic fault slip and interseismic slip deficit simultaneously. The new method is tested using a simulated distribution of fault slip and the inversion analysis successfully reproduced the original fault slip distribution. Such an inversion method is applicable to a data assimilation process for numerical simulations intending crustal activity forecast.

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