Anisotropy in electromagnetic field variations and its implication for lateral inhomogeneity of the electrical conductivity structure

Details Anisotropy in electromagnetic field variations and its implication for lateral inhomogeneity of the electrical conductivity structure Anisotropy in electromagnetic field variations and its implication for lateral inhomogeneity of the electrical conductivity structure

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...53..278h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 53, Issue 3-4, p. 278-286.

Physics

3

Scientific paper

Two-dimensional analyses of magnetotelluric data provide information on anisotropic response for two different polarization cases; the so-called B-polarization and E-polarization cases. Similar anisotropy should also be observed in the horizontal components of magnetic field variations. On the assumption that a reference station provides the normal magnetic field, transfer functions for the horizontal magnetic fields can be derived in a fashion similar to the impedance analysis for magnetotelluric data. We applied this method to magnetic data obtained at some observation sites in a geothermal area in Japan. Transfer functions for the horizontal magnetic fields exhibit a strong anisotropy with the preferred direction nearly perpendicular to that for the electric field. This result implies the existence of strong electric currents flowing in the direction perpendicular to the above preferred direction for the magnetic field. The present method was also applied to the horizontal components of magnetic field variations observed at the seafloor. In this case, a magnetic observatory on land was taken as the reference station, and attenuation of the amplitude of horizontal magnetic field variation was examined. Anisotropy in attenuation was then found with the preferred direction perpendicular to the axis of the Okinawa trough where the seafloor measurement was undertaken.

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