Correlation of the anomalies in the electric field and electric conductivity of the lithosphere to earthquakes in Kamchatka

Abstract

The data of long term electromagnetic monitoring are used for studying the dynamics of electric conductivity of the medium and the electric field of the terrestrial sources. The electric conductivity of the medium is estimated from the magnetotelluric transfer functions (impedance tensor and telluric tensor). The electric field of terrestrial sources is identified by filtering the variations of the observed electric field of the Earth. The magnetotelluric parameters and the electric field of terrestrial sources feature anomalous changes of supposedly earthquake related origin. The anomalies associated with the same earthquake are not simul taneous. It is shown that these anomalies are generated by processes occurring at different depths. The strong earthquake is preceded by the appearance of surface anomalies several months before the event and accom panied by a deep coseismic anomaly. The probable nature of the recognized anomalies is discussed.

Model of the singular current source—The indicator of geodynamic processes in Japan in 2009-2011

“…We can speak about passive variations are associated with variations of the integral parameters of the environment, and active -caused by existence of current systems. Variations of pressure, humidity, temperature, structural changes or rock destruction are reflect in the geoelectric characteristics of the geological section [6,8,11]. Active sources of electric current, generated under pressure in the course of rock failure, may also be the causes of electromagnetic anomalies [9,10].…”

“…A wide complex of geophysical research is applied to studying the phenomena occurring and diagnostics of seismic activation of the region. It is primarily direct method: seismic survey and registration of radiation associated with the deformation and crushing of rock-the acoustic and low-frequency electromagnetic radiation, gas emanations [1][2][3][4][5] Preparation processes are reflected variations of anomalies of temperature and pressure, electrical resistivity of the earth's crust [6][7][8][9][10][11]. Due to the close interaction of geophysical shells, the Earth abnormal physical fields of the lithosphere in the process of earthquake preparation excite anomalies in the atmosphere and ionosphere.…”

Electromagnetic Monitoring of Modern Geodynamic Processes: An Approach for Micro-Inhomogeneous Rock through Effective Parameters

“…Research on electrical parameters and related phenomena in geodynamically active zones is being conducted worldwide [24][25][26][27], including seismically hazardous regions such as Altai [28][29][30], Tien Shan [31][32][33][34], Kamchatka [35,36], and Kola [21,37]. The results of these studies indicate a correlation between changes in electrical resistivity and geodynamic processes occurring in deep layers of the Earth's crust.…”