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| 江宁台井下地电阻率变化初步分析 |
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樊晓春1, 李伟2, 鲍海英3, 董淼4, 吴帆1, 袁慎杰5
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1.南京市地震监测预警中心, 南京 210008;2.南京基准地震台, 南京 210014;3.江苏省地震局, 南京 210014;4.新沂地震台, 江苏新沂 221400;5.南京市江宁区地震办公室, 南京 210014
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| 摘要: |
| 江宁台附近地铁可能对地电阻率观测的干扰较大，通过提取江宁台井下地电阻率夜间数据来分析其变化并探讨机理。结果表明：①江宁台井下地电阻率具备一定地表浅层抑制干扰能力，主要干扰源为地铁；②夜间1~3时数据突跳与地铁不定期维护有关；③井下地电阻率观测NS（AB=1000m）和NS（AB=200m）2018年10月开始出现快速下降变化后，江宁台周围地震强度明显增强，认为该变化与S340公路金属护栏无关；④井下地电阻率长趋势下降变化与周围深井水位变化一致，反映了周围区域应力调整的变化；⑤井下地电阻率观测EW（AB=200m）在安徽无为ML 4.1地震前出现的"U"型变化与新建S340公路无关；⑥江宁台井下地电阻率共观测到5次"U"型变化，认为与地震有关的可能性较大。 |
| 关键词: 地电阻率 井下观测 地铁 地震 |
| DOI： |
| 分类号:P315 |
| 基金项目:中国地震局地震科技星火计划（XH19015YSX）、国家自然科学基金（A413740808）共同资助 |
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| Preliminary Analysis of Resistivity Variation in Deep-well Observation at the Jiangning Seismic Station |
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Fan Xiaochun1, Li Wei2, Bao Haiying3, Dong Miao4, Wu Fan1, Yuan Shenjie5
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1.Nanjing Earthquake Monitoring and Early Warning Center, Nanjing 210008, China;2.Nanjing Seismic Station, Nanjing 210014, China;3.Jiangsu Earthquake Agency, Nanjing 210014, China;4.Xinyi Seismic Station, Xinyi 221400, Jiangsu, China;5.Jiangning District Earthquake Office, Nanjing 210014, China
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| Abstract: |
| The URRT can cause great impacts on the deep-well resistivity observation. In this paper we analyzed the resistivity variation and discuss the mechanism by extracting the night data of geo-electrical resistivity in Jiangning Seismic Station. The results show that:①the deep-well observation of Jiangning station has good inhibition to surface and shallow interference,and the main source of interference for deep-well observation is the URRT. ②The sudden change of data from 01 to 03 at night is related to the irregular maintenance of the URRT. ③The rapid decline of the deep-well geo-electrical resistivity observation NS(AB=1000m)and(AB=200m)in October 2018may not be related to the metal guardrail of S340 highway,and the earthquake intensity around Jiangning station is obviously enhanced. ④The decrease of the long trend of the deep-well geo-electrical resistivity is consistent with the change of water level in the surrounding deep well,which reflects the change of regional stress adjustment. ⑤The "U" change of the deep-well geo-electrical resistivity EW(AB=200m)before the Anhui Wuwei ML4.1 earthquake is not related to the newly built S340 highway.⑥There are 5 "U" changes in the deep-well geo-electrical resistivity of Jiangning station,which we believe that it is very likely to be related to earthquakes. |
| Key words: Geo-electrical resistivity Deep-well observation URRT Earthquake |
