| Anisotropy of the apparent resistivity variation rate near the epicentral region for strong earthquakes |
| |
| 作者姓名： | 杜学彬 阮爱国 范世宏 郝臻 |
| |
| 作者单位： | DU Xue-bin1) RUAN Ai-guo2) FAN Shi-hong1) HAO Zhen1) 1) Lanzhou Institute of Seismology，China Seismological Bureau，Lanzhou 730000，China 2) Institute of Geophysics，China Seismological Bureau，Beijing 100081，China |
| |
| 基金项目： | Sub-project from China Seismological Bureau (95-04-01-01-09)，the Natural Science Foundation of Gansu Province (ZS-001-A25-01 |
| |
| 摘 要： | IntroductionThe geo-electrical anisotropy before earthquake is of special significance for the prediction of earthquake location and for the research on crustal stress status near the epicentral region. The anisotropy has been studied from various aspects (CHEN, et al, 1983; QIAN, et al, 1985, 1996; LU, et al, 1990a; MAO, et al, 1995; RUAN, et al, 1999). But the anisotropic phenomena presented by geo-electrical data are not practically satisfactory and not clear as compared with the res…
|
Anisotropy of the apparent resistivity variation rate near the epicentral region for strong earthquakes |
| |
| DU Xue-bin,RUAN Ai-guo,FAN Shi-hong,HAO Zhen.Anisotropy of the apparent resistivity variation rate near the epicentral region for strong earthquakes[J].Acta Seismologica Sinica(English Edition),2001,14(3):303-314. |
| |
| Authors: | DU Xue-bin RUAN Ai-guo FAN Shi-hong HAO Zhen |
| |
| Institution: | 1. Lanzhou Institute of Seismology, China Seismological Bureau,
2. Institute of Geophysics, China Seismological Bureau, |
| |
| Abstract: | The apparent resistivity data of 11 stations observed in or near the epicentral regions for 6 strong earthquakes are processed by the normalized monthly rate method. The result show that in the medium-short and short-imminent terms of earthquake preparation the variation rate of apparent resistivity perpendicular (or near perpendicular) to the direction of maximum principal stress is greater than that parallel (or near parallel) to the direction. Such anisotropic phenomenon is interpreted as follow: the predominant alignment of cracks containing conductive fluid in the maximum principal stress direction caused the anisotropy of the fluid migration during the dilatancy process in the late period of earthquake preparation and resulted in the anisotropy of true resistivity variation rate for rock (or solid) medium which induced the variation rate anisotropy of apparent resistivity on the ground. The study of this paper provides some seismic examples to show the apparent resistivity anisotropy which may be helpful to study the stress status in or near the source zone in the late period of earthquake preparation of strong events. |
| |
| Keywords: | near epicentral region strong earthquake apparent resistivity true resistivity anisotropy principal compressional stress |
| 本文献已被 CNKI 万方数据 SpringerLink 等数据库收录！ |
