Physics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...81..215b&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 81, Issue 1-4, p. 215-229.
Physics
4
Scientific paper
Anomalous distribution of induction arrows in the Japanese island arc has been supposed to be due, at least partly, to induced electric currents flowing in the surrounding seas. None the less, no reliable estimation has been made of this regional problem. Here we attempt to solve the problem, using the algorithm of bimodal electromagnetic induction in a thin-sheet conductor. The non-uniform conductance of the thin sheet corresponds to seawater depths in the surrounding seas. It is found out that induction arrows are controlled strongly by the open seas such as the Pacific Ocean. The effect of the semi-closed Japan Sea is somewhat weaker, and is dependent on period. A detailed comparison between the calculated and the observed induction arrows over the Japanese island arc indicates, however, that the sea effects alone cannot fully account for the observations. The differences between the observed and the calculated responses delineate lateral inhomogeneities in the subsurface conductivity structure which are not included in the present model.
Bapat V. J.
Honkura Yoshimori
Segawa Jiro
Tarits Pascal
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