Application Of 3D Inversion To Magnetotelluric Data In The Ogiri Geothermal Area, Japan

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Conference Paper: Application Of 3D Inversion To Magnetotelluric Data In The Ogiri Geothermal Area, Japan

Abstract
A stable inversion technique has been developed for threedimensional (3D) interpretation of magnetotelluric (MT) data. The inversion method is based on the Gauss-Newton (linearized least-squares) method with smoothness regularization. Static shifts are also treated as unknown parameters in the inversion. The forward modeling is done by using the staggered-grid finite difference method. A Bayesian criterion ABIC is applied to searching for the optimum trade-off among the minimization of the data misfit, model roughness and static shifts. The inversion method was then applied to a large volume MT dataset obtained in the Ogiri geothepnal area, southwestern Japan. The inversion was performed stably, resulting in a good fitting between the observed and computed apparent resistivities and phases. The recovered 3D resistivity structure is generally similar to the two-dimensional (2D) inversion models, although the deeper portion of the 3D model seems to be more realistic than that of the 2D model. The 3D model is also in a good agreement with the geological model of the geothermal reservoirs. These results indicate the necessity of the 3D interpretation for geothermal exploration and other application in complicated geological environments.

Author 
Toshihiro Uchida








Published 
GRC, 2003





DOI 
Not Provided
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Citation

Toshihiro Uchida. 2003. Application Of 3D Inversion To Magnetotelluric Data In The Ogiri Geothermal Area, Japan. In: (!) ; (!) ; (!) . (!) : GRC; p. (!)