Development of a new scheme of the joint-inversion for seismic and resistivity structures

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In order to derive detailed information on the subsurface interstitial fluids and elucidate mechanism of crustal activities such as seismic and volcanic activities related to existence of the fluids, we developed a new 2-D inversion scheme, which jointly inverted EM responses and seismic travel times. In the scheme, material characteristics such as water content, pore geometry and host rock type are estimated as model parameters and structures of resistivity and seismic velocity are obtained at the same time. Since tests of the scheme by using synthetic models revealed necessity of further improvements in respective EM and seismic inversion methods, we also tried to improve the EM inversion scheme.