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Generation of ULF geomagnetic pulsations during early stage of earthquake preparation
Authors:VM Sorokin  OA Pokhotelov
Institution:1. Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), Russian Academy of Sciences, 142190 Troitsk, Moscow Region, Russian Federation;2. Institute of Physics of the Earth (IFZ), Russian Academy of Sciences, 123995 Moscow, 10 B. Gruzinskaya, Russian Federation;1. Institute of Geophysics, ETH, Zürich, Switzerland;2. Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, USA;3. Division of Geomagnetism, National Space Institute, Technical University of Denmark, Kgs. Lyngby, Denmark;1. Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;1. Institute of Physics of the Earth, Russian Academy of Sciences, 10 Gruzinskaya, 123995 Moscow, Russia;2. Chubu University, Engineering Science Laboratory, College of Engineering, Kasugai, Aichi 485-8501, Japan;3. Hayakawa Institute of Seismo Electromagnetics, Co. Ltd., UEC (University of Electro-Communications) Incubation Center, 1-5-1, Chofugaoka, Chofu, Tokyo 182-8585, Japan;4. UEC, Advanced Wireless Communications Research Center, Chofu, Tokyo, Japan;5. Earthquake Analysis Laboratory, Information Systems Inc., 2-12-42-305, Kita-aoyama, Minato-ku, Tokyo 107-0061, Japan;1. Department of Physics, University of Athens, Panepistimiopolis, Zografos, Athens GR-15784, Greece;2. Department of Electronics Engineering, Piraeus University of Applied Sciences (TEI of Piraeus), 250 Thivon and P. Ralli, Aigalao, Athens GR-12244, Greece;3. Hayakawa Institute of Seismo-Electromagnetics Co. Ltd., UEC (University of Electro-Communications) Incubation Center, 1-5-1 Chofugaoka, Chofu Tokyo, 182-8585, Japan;4. UEC, Advanced Wireless & Communications research Center, 1-5-1 Chofugaoka, Chofu Tokyo, 182-8585, Japan;5. Earthquake Analysis Laboratory, Information Systems Inc., #305, Kita-aoyama 2-12-42, Minato-ku, Tokyo, 107-0061, Japan;6. Institute of Physics of the Earth, Russian Academy of Sciences, 10 Bolshaya Gruzinskaya, 1243995, Moscow, Russia;1. Centre de Physique Théorique UMR 7332, CNRS/Aix-Marseille Univ./Univ. du Sud Toulon-Var, CNRS Luminy Case 907, 13288 Marseille Cedex 9, France;2. Laboratoire Particules et Univers de Montpellier, CNRS-IN2P3, Case 070, Place Eugène Bataillon, 34095 Montpellier, France;3. Institute of High-Energy Physics (iHEPMAD), University of Antananarivo, Madagascar;1. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;2. Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;3. Institute of Earthquake Science, China Earthquake Administration, China
Abstract:A new mechanism of generation of ULF geomagnetic pulsations near the Earth’s surface near the future earthquake epicenter is proposed. The mechanism is connected with the migration of fluid and gases during the active phase of the earthquake preparation. The motion of fluid and gases is accompanied by the formation of cracks and fast filling of them by fluid and gases. The variation of electrical conductivity in the layer induces the impulsive electric current. The magnetic field due to this current can be registered on the Earth’s surface. The corresponding equations for magnetic field perturbations caused by non-stationary conductivity are derived. The amplitude and temporal characteristics of the magnetic impulses are estimated.
Keywords:
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