|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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