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| | Abstract | | In the geothermal exploration, spatial resolution of subsurface resistivity structure obtained by Magnetotelluric (MT) method is limited due to the limited number of observation sites. It is mainly caused by the steep topographic relief in geothermal field interrupting the installation of long cables for electric-field measurements. For solving this problem, ultra-short-baseline AMT measurement was devised in which the electric cable was set as short as about 0.6m. Using this method, we acquired AMT data at about 90 locations in Japan geothermal field and performed three-dimensional inversion analysis. As the result, in the ultra-short-baseline AMT survey, although the data quality at one site is lower than that of ordinary AMT survey, it was found that it is possible to acquire data reflecting the subsurface structure sufficiently and can also be used for resistivity structural analysis. |
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