Analogue, numerical and field site studies of EM induction in the China-Korea-Japan region.

摘要

Electromagnetic induction in the continental Bohai Bay coastal region of China and the island region of Japan is studied with the aid of laboratory analogue models. Detailed model measurements of the electric (E;The analogue model results indicate that the effects of peninsulas, straits, bays and the irregularities in the coastlines play an important role in determining the electric and magnetic field responses both on-shore and off-shore for this complex coastal Bohai Bay region.;Large gradients in the in-phase B;Coast effect response values for 3D laboratory analogue models are employed to approximately remove the geomagnetic coast effects in field measurements for some coastal sites. The resulting difference arrows indicate a N-S striking conductor to the west of Bohai Bay in the form of an upweeling in the conductive substratum (with conductivity 0.5 Sm;Difference arrows for complex island regions of Japan support the premise of two conductive anomalies (with conductivity 0.5Sm