Geophysical Journal | 2015 volume 37 6

Geomagnetic activity impacts on the results of the induction vector calculations

© I.I. Rokityansky, V.I. Babak, A.V. Tereshyn, 2015

Induction vector has temporal variations caused by changes of geomagnetic activity when the average amplitude of the MT-field is comparable to noise amplitude. Frequency characteristics of these temporal variations are studied for several Japanese observatories. Temporal variations cover a range from units to 1,000 and more seconds on observatories situated close to railways, powered by direct current. In other cases, these variations appear on shorter periods.

Key words: electromagnetic response functions, induction vector, electrical conductivity of the lithosphere, geomagnetic activity, magnetotelluric field.

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