Frictional discharge at fault asperities: Origin of fractal seismo-electromagnetic radiation |
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| Authors: | Jun Muto Hiroyuki Nagahama Takashi Miura Ichiro Arakawa |
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| Affiliation: | aDepartment of Geological Sciences, Brown University, Providence, RI 02906, USA;bDepartment of Geoenvironmental Sciences, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan;cDepartment of Physics, Gakushuin University, Tokyo, 171-8588, Japan |
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| Abstract: | To investigate the relation between the rock friction and the fractal electromagnetic radiation before the main-shock of earthquakes, we conducted a friction experiment simulating the motion of an asperity on a fault plane, and observed photon emissions due to electric discharge by dielectric breakdown of ambient gases from friction contacts between rock minerals. This indicates that frictional discharges (plasma generations) could occur locally at microscopic asperities on fault surfaces. From concepts on the fractal size-distribution and temporal evolution of fault asperities, the frictional discharge occurring at asperities on the fault plane can be one of origins of the fractal electromagnetic radiation (Benioff electromagnetic radiation) prior to earthquakes. |
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| Keywords: | Benioff electromagnetic radiation Fractal Seismo-electromagnetic radiation Asperity Frictional discharge plasma Damage mechanics |
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