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Correction of static-shift on magnetotelluric data in the central part of northeastern Japan

Correction of static-shift on magnetotelluric data in the central part of northeastern Japan

Bosai Kagaku Gijutsu Kenkyujo Kenkyu Hokoku = Report of the National Research Institute for Earth Science and Disaster Prevention 60: 81-91

Magnetotelluric (MT) data on three transects have been obtained in the central Tohoku district of the northeastern Japan, where the Pacific plate subducts beneath the Eurasian plate. We have already reported the 2-D resistivity model on each transect using the broadband magnetotelluric sounding data (0.00005-300 s period) taking account of the ocean effect. We conducted measurements and analysis to estimate the surface inhomogeneity effects on the MT impedance tensor for the purpose of obtaining a more reasonable 2-D model. The TEM (Transient Electromagnetic Sounding Measurement) was conducted at all 70 sites of MT observations to estimate the site gain factor in the impedance decomposition analysis. The estimated static-shift was found to be almost less than 0.3 decades. In particular, the static-shift around plains is small, suggesting that the previous resistivity model around the plain is plausible. The static-shift in the mountainous area, however, is rather large indicating that we need to be careful to interpret the results in those areas and to construct a more reasonable model by taking account of the 3-D heterogeneity effects including the static shift.

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Accession: 018637260

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