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| | Abstract | | In order to carry out the magnetotelluric survey to investigate the resitivity structure in the coastal zone, analysis method to reduce the coast effect is required. Widely used 2-D inversion method restricts the reducible coast effect. 3-D inversion method is more advantageous than 2-D inversion. However, it is difficult to make rigid 3-D model assuming the sea water. We suggest the know-how for 3-D inversion using large inversion domain to be able to reconstruct the low resistivity area corresponds to sea water from the data with distortion induced by coast effect. We carried out magnetotelluric survey at the area of Mt.Sambe in Shimane prefecture to examine suggested know-how. MT data was inverted using the 3-D inversion code of Sasaki,2004. As a result, thin low resistivity area was detected that corresponded to sea water. Under ground resistivity structure was also good agreement with existing geophysical data. Considering the above, 3-D inversion code is expected to be effective for distortion induced by coast effect. |
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