Induced electromagnetic emission of rocks containing semiconductor minerals

Sobolev, G. A.; Maibuk, Z. Yu. Ya.

doi:10.1134/s1028334x13110056

Cited by 3 publications

(2 citation statements)

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“…Considering that the energy released by a structural EQ is accumulated before the EQ, the PSEA may correspond to the process of stress-accumulation in a causative fault. Such an inference has been experimentally demonstrated by many authors (Finkelstein and Powell 1970;Finkelstein et al 1973;Scholz et al 1973;Nitsan 1977;Bishop 1981;Sobolev et al 1982;Wang and Wang 1985;Wu et al 1990;Sasaoka et al 1998;Teisseyre 2002;Hadjicontis et al 2004;Yoshida and Ogawa 2004). Figure 2a shows the experiment by Freund and colleagues who applied stress to one side of a 120 cm ⋅ 15 cm ⋅ 10 cm granite slab and measured the generated currents using the electric circuit (Freund et al 2006;Freund 2007a;b).…”

Section: Formation Mechanism Of Psea-experimental Investigationmentioning

confidence: 74%

“…2). Other rock types, either without quartz (such as carbonatite), or with a random arrangement of quartz grains (such as quartz-bearing sedimentary rocks and some metamorphic rocks) typically show weak electric effects (Nitsan 1977;Sobolev et al 1982;Wang and Wang 1985;Sasaoka et al 1998;Teisseyre 2002;Hadjicontis et al 2004;Yoshida and Ogawa 2004;Freund et al 2006). This means that if the generation of a PSEA is due to stress on rock in the seismogenic zone, the rock should be granite (Finkelstein et al 1973;Sadovskii 1986;Wu et al 1990;Sasaoka et al 1998).…”

Section: Geological Support From Studies On Granite Genesis and Geotrmentioning

confidence: 99%

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Fracture Electric Field: A Synthetic Model for Seismogenic Process and its Relationship with Preseismic Electric Anomalies and Earthquakes

Chen¹,

Chen²

2020

Preprint

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Unobservability of the seismogenic process in a causative fault that makes earthquake (EQ) prediction difficult. Although the relationship between the preseismic electric anomaly (PSEA) and the mainshock indicates that both the PSEA and EQ may originate from same course proceeding in the seismogenic zone, as evidenced by experiments on stressed granite, geological interpretation of those observations, and experiments was limited by the traditional granite formation theory. Based on new information from studies of granite genesis and geotransects, we present a synthetic model, the fracture electric field (FEF), to elucidate the seismogenic process on a causative fault and its logical linkage with the PSEA and EQ. The model is constrained with various data from the 1975 Haicheng EQ and verified by survey data from an FEF monitor station constructed in 2012 in Guangzhou, China. The main conclusions are as follows:(1) An uneven or undulant fault-plane is the prerequisite for stress-accumulation in the locality of the plane to form a seismogenic zone;(2) The position of the continental seismic layer corresponds to that of the crustal granite layer, suggesting that the seismogenic process of any causative fault in continents may produce the PSEA;(3) A normal FEF exists in a causative fault and can be measured beyond the preseismic situation. Thus, it is possible to detect the seismogenic process of a fracture through monitoring the variation of its FEF when the fracture enters a preseismic situation.

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