E3S Web Conf.
Volume 11, 2016VII International Conference “Solar-Terrestrial Relations and Physics of Earthquakes Precursors”
|Number of page(s)||6|
|Published online||04 November 2016|
Anomalous changes of vertical geomagnetic field in Kamchatka
1 Institute of Volcanology and seismology, Far Eastern Branch, Russian Academy of Sciences
2 Institute of Cosmophysical Research and Radio Wave Propagation of the Far Eastern Branch of Russian Academy of Science
3 Kamchatka Branch of the Geophysical Service of the Russian Academy of Sciences
* e-mail: email@example.com
Secular variations of the vertical geomagnetic field at Paratunka (Kamchatka), Kakioka (Honshu), Mamambetsu (Hokkaido) and Patrony (Irkutsk) are considered from 1968 to 2014. Comparative analysis of secular variations showed that from 1968 to 2001, similar variations with the intensity of first hundreds on nT are obvious at four observatories. For the following period from 2001 to 2014, the secular variation at Paratunka observatory differs from other observatories. This disagreement of the secular geomagnetic variation at Paratunka observatory is timed to the increase of seismicity at the depth of 400-700 km in South Kamchatka region. It is suggested that in the result of increase of the seismicity in the region of transition from the upper to lower mantle, physical and chemical processes became more active. That caused formation of a large geo-electrical inhomogeneity which affected the behavior of the vertical component of geomagnetic field.
© The Authors, published by EDP Sciences, 2016
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