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| 长宁MS6.0地震前后地电场秒数据变化特征研究 | |
| 引用本文： | 席继楼,陈敏,董蕾,刘超,关华平. 长宁MS6.0地震前后地电场秒数据变化特征研究[J]. 地震, 2020, 40(4): 129-143. DOI: 10.12196/j.issn.1000-3274.2020.04.010 |
| 作者姓名： | 席继楼 陈敏 董蕾 刘超 关华平 |
| 作者单位： | 1.中国地震局地震预测研究所, 北京 100036; 2.中国地震局地震预测重点实验室, 北京 100036; 3.重庆市地震局, 重庆 401147 |
| 基金项目： | 国家重点研发计划项目(2018YFC1503700); 中国地震科学实验场专项(2019CSES0115) |
| 摘 要： | 地电场是地球电磁场的重要组成部分。 本文利用传统的时间序列统计分析方法, 对重庆市所属仙女山地震台的地电场秒采样观测数据变化特性进行了研究和讨论。 结果显示: ① 长宁MS6.0地震前后, 在距离震中390 km的仙女山地震台, 记录到了地电场异常变化; ② 仙女山台地电场异常变化的平均方位角为N77.55°E, 大约由长宁MS6.0地震震中位置指向仙女山地震台方向; ③ 仙女山地震台的典型地电场异常变化为间歇性不定周期变化, 在长宁MS6.0地震发震前8天开始密集出现, 震后第4天以后, 逐步转化为较高频率扰动变化; ④ 仙女山台地电场异常变化成簇出现, 每一簇变化由多组按照非线性规律衰减的阶跃变化信号组合叠加而成。 综合分析认为: 长宁MS6.0地震前后地电场异常变化, 主要与发震构造裂隙突变和岩体微破裂过程中, 地下流体高压运移产生的过滤电动势有关。 |
| 关 键 词： | 长宁MS6.0地震 地电场观测 异常变化 秒采样数据 |
| 收稿时间： | 2019-12-25 |
Study on the Second Data Variation Characteristics of Geoelectric Field before and after Changning MS6.0 Earthquake |
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| XI Ji-lou,CHEN Min,DONG Lei,LIU Chao,GUAN Hua-ping. Study on the Second Data Variation Characteristics of Geoelectric Field before and after Changning MS6.0 Earthquake[J]. China Earthguake Engineering Journal, 2020, 40(4): 129-143. DOI: 10.12196/j.issn.1000-3274.2020.04.010 | |
| Authors: | XI Ji-lou CHEN Min DONG Lei LIU Chao GUAN Hua-ping |
| Affiliation: | 1. Institute of earthquake prediction, China Seismological Bureau, Beijing 100036, China; 2. Key Laboratory of Earthquake Prediction, China Seismological Bureau, Beijing 100036, China; 3. Chongqing Earthquake Agency, Chongqing 401147, China |
| Abstract: | The geoelectric field is an important part of the earth electro-magnetic field. Using the traditional time series statistical analysis method, this paper studies and discusses the variation characteristics of the second sampling data of the geoelectric field observed from Xiannushan seismic station, which belongs to the Chongqing municipality. The results show that: ① before and after Changning MS6.0 earthquake, the anomalous change of the geoelectric field were recorded at Xiannushan seismic station, 390 km away from the epicenter; ② the average azimuth angle of the anomalous change was N77.55°E, approximately from the epicenter of Changning MS6.0 earthquake to Xiannushan seismic station; ③ the typical anomalous change of the geoelectric field was intermittent and non-periodic disturbance, which densely appeared 8 days before the main shock of Changning MS6.0 earthquake, lasted to the 4th day after the main shock, and then gradually transformed into the high-frequency disturbance changes; ④ the anomalous change of the geoelectric field appeared in lots of clusters, each of which is composed of multiple groups of step mutation with nonlinear attenuation. According to the comprehensive analysis, the anomalous change of the geoelectric field before and after Changning MS6.0 earthquake, may be related to the filtered electromotive force generated by the high-pressure migration of the underground fluid, during the change of the structural fracture and the process of the rock micro fracture. |
| Keywords: | Changning MS6.0 earthquake Geoelectric field observation Anomalous change Second sampling data |
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