Observational evidence of anisotropic changes apparent resistivity before strong earthquakes
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917894593445888 |
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| author | Zhang, Jianguo Du, Wei Yue, Mingxin Liu, Chenghui Liang, Xiaolong Yang, Jun |
| author_facet | Zhang, Jianguo Du, Wei Yue, Mingxin Liu, Chenghui Liang, Xiaolong Yang, Jun |
| contents | Using a method based on normalized monthly variation rate, we studied resistivity data of seven observation stations before the events in the epicenter areas of two strong earthquakes. The relationship between variation of anisotropic apparent resistivity and the azimuth of the maximum principal stress is analyzed. The study shows that significant apparent resistivity variation occurs in the direction that is perpendicular to the azimuth of the maximum principal stress while only small fluctuation are recorded in the direction of the maximum principal stress. We surmise that the variation of anisotropic resistivity occurs in the late stage of the development of a strong earthquake, which can be observed in the epicenter area. If the density of the observation stations is increased and the direction of the observed resistivity is right, the epicenter of an earthquake location may be estimated by the observed resistivity anomaly. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09131 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observational evidence of anisotropic changes apparent resistivity before strong earthquakes Zhang, Jianguo Du, Wei Yue, Mingxin Liu, Chenghui Liang, Xiaolong Yang, Jun Geophysics 86A25 (Primary), 86A15 (Secondary) F.2.2; I.2.7 Using a method based on normalized monthly variation rate, we studied resistivity data of seven observation stations before the events in the epicenter areas of two strong earthquakes. The relationship between variation of anisotropic apparent resistivity and the azimuth of the maximum principal stress is analyzed. The study shows that significant apparent resistivity variation occurs in the direction that is perpendicular to the azimuth of the maximum principal stress while only small fluctuation are recorded in the direction of the maximum principal stress. We surmise that the variation of anisotropic resistivity occurs in the late stage of the development of a strong earthquake, which can be observed in the epicenter area. If the density of the observation stations is increased and the direction of the observed resistivity is right, the epicenter of an earthquake location may be estimated by the observed resistivity anomaly. |
| title | Observational evidence of anisotropic changes apparent resistivity before strong earthquakes |
| topic | Geophysics 86A25 (Primary), 86A15 (Secondary) F.2.2; I.2.7 |
| url | https://arxiv.org/abs/2501.09131 |