| NEW technique to reveal and study the precursor of earthquakes IN THE ELECTRICITY OF NEAR-GROUND ATMOSPHERE |
O.P. Rulenko1,2 1Institute of Volcanology and Seismology FED RAS, Petropavlovsk-Kamchatsky, 683006, Russia; e-mail: rulenko@kscnet.ru2Institute of Cosmophysical Researches and Radio WavePropagation FED RAS, Paratunka, Kamchatsky country, 684034, Russia We introduce a unique technique proved by the physics to reveal and study the earthquake precursors in the electricity of the near-ground atmosphere. Unlike the method of detecting the precursor in the behavior of the electric field, the author for the first time studies the electric state of the near-ground air. The technique consists of measurement of the field potential gradient along with the air polar conductivities. It also includes the analysis of: 1) the unipolarity coefficient values; 2) the space charge density of small ions; 3) the vertical electric conduction current density. Besides, the technique considers the weather observation data. The author used the technique for backcasting of the electrical state of the near-ground air prior to the earthquake near South Kamchatka in August 30, 2004 (M = 6, 400 km far from the measurement site). For the first time we recorded an anomalous disturbance of the near-ground air electrical state prior to an earthquake. It started three days and ceased 9-12 hours prior to the event. No disturbance was revealed after the earthquake. The author has found the cause and certain peculiarities of that disturbance. |
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