Dynamic evolution patterns of the degree of ground resistivity anisotropy and the seismogenic process |
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Authors: | TONG-EN MAO GUANG-YIN XU SI-YUAN FAN MING ZHAO JING-FANG SUN |
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Affiliation: | 1. Institute of Geophysics, China Seismological Bureau, Beijing 100081, China 2. Seismological Bureau of Beijing, Beijing 100080, China 3. Earthquake Research Institute of Lanzhou, China Seismological Bureau, Lanzhou 730000, China |
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Abstract: | Following a new train of thinking, this paper has explored first the potential information in the ground resistivity data observed by the existing geoelectric observation system, investigated and proposed a new dimensionless geoelectric precursor factor, the degree of ground resistivity anisotropy, S, and studied the characteristics of dynamic evolution pattern of S during the seismogenic process. The results show that, during the seismogenic process, the degree of ground resistivity anisotropy (S) displays a process of “normal” → “abnormal strengthening (amplitude, range)” → “abnormal weakening” → “earthquake occurrence” → “normal”. The earthquake would occur at the time when the S value has entered the late stage of strengthening and turns to weaken and in the gradient belt on the margin of S anomaly region. The dynamic evolution pattern of S reflects the changes of the tectonic stress field during the seismogenic process. Therefore, it would be possible to trace the process of earthquake generation and occurrence from the dynamic evolution pattern of S so as to service earthquake prediction. Contribution No. 99FC2012, Institute of Geophysics, China Seismological Bureau. This paper is supported by the Project 95-04-04 from China Seismological Bureau. |
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Keywords: | degree of ground resistivity anisotropy dynamic evolution pattern seismogenic process |
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