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Interpretation of charging on fracture or frictional slip surface of rocks
Authors:Akihiro Takeuchi  Hiroyuki Nagahama
Affiliation:

Department of Geoenvironmental Sciences, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan

Abstract:Fracturing and frictional sliding of quartz and granite under dry condition generates fractoluminescence, charged particle emission and electromagnetic radiation. Various kinds of experiments indicate that surface charge density on fracture or frictional slip surface of quartz and granite is 10−4 to 10−2 C/m2 which is larger than bound charges induced by the disappearance of piezoelectricity due to the release of stress. Hole and electron trapping centers, which is found in semiconductor devices with the Si–SiO2 system, are causes of surface charging on fracture or frictional slip surface of quartz crystal. The quantity of the surface charge is enough to cause corona discharge that can generate earthquake lights. The mechanism considering the hole and electron trapping centers has a probability to explain why non-piezoelectric minerals or rocks generate electromagnetic phenomena. It can be one of origins of seismo-electromagnetic phenomena (SEP).
Keywords:Quartz   Surface charge   Semiconductor device   Hole and electron trapping centers   Seismo-electromagnetic phenomena
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