地震研究

对近两年河源发生的几次地震的地电阻率测值资料进行分析,发现和平地电台的深孔地电阻率测值不同于大多数观测台地电阻率的异常变化,表现为正常时期长趋势下降,地震前转平或上升。对此情况进行了探讨,认为是电极极化及震前导电离子上涌所致; 在此基础上建立了有限元模型,并采用数值模拟的方法对此进行印证。

Analyzing the measuring value of deep-hole geoelectric resistivity during the earthquakes occurred in Heyuan in the recent two years,we found that be different from the anomaly variation at most geoelectric resistivity stations,the daily mean value curve of deep-hole geoelectric resistivity at Heping station showed the long trend of decline in quiet periods while turning flat or rising before the earthquake. On the basis of analyzing and discussing the data,we believe that the observed changes due to the electrode polarization and the concentration rising changing of conductive particle,which was verified by constructing a three-dimensional finite element model and using the numerical simulation method.

引言
1 台站概况
3 观测结果分析
4 有限元数值分析
5 计算结果
6 结论与讨论

图1 和平地电台地理位置图<br/>Fig.1 The location map of Heping Geoelectric Station

图1 和平地电台地理位置图
Fig.1 The location map of Heping Geoelectric Station

图2 和平地电台深孔电阻率布极图<br/>Fig.2 The electrode layout of the deep-hole resistivity of Heping Geoelectric Station

图2 和平地电台深孔电阻率布极图
Fig.2 The electrode layout of the deep-hole resistivity of Heping Geoelectric Station

图3 和平地电台地电阻率异常曲线<br/>Fig.3 Resistivity anomaly before the Heyuan earthquakes observed at Heping Geoelectric Station

图3 和平地电台地电阻率异常曲线
Fig.3 Resistivity anomaly before the Heyuan earthquakes observed at Heping Geoelectric Station

图4 河源地震前黄子洞水氡五日值曲线异常<br/>Fig.4 Anomaly in 5-day-value curve of water radon at Huangzidong Station before Heyuan earthquakes

图4 河源地震前黄子洞水氡五日值曲线异常
Fig.4 Anomaly in 5-day-value curve of water radon at Huangzidong Station before Heyuan earthquakes

表1 测区电性结构数据表<br/>Tab.1 The data sheet of electrical structure in measurement area

表1 测区电性结构数据表
Tab.1 The data sheet of electrical structure in measurement area

图5 地电阻率有限元模型<br/>Fig.5 Finite element model of deep-hole resistivity

图5 地电阻率有限元模型
Fig.5 Finite element model of deep-hole resistivity

图6 视电阻率随电极极化的变化曲线<br/>Fig.6 Apparent resistivity curve varied with the electrode polarization

图6 视电阻率随电极极化的变化曲线
Fig.6 Apparent resistivity curve varied with the electrode polarization

图7 视电阻率随导电离子浓度改变的变化曲线<br/>Fig.7 Curve of apparent resistivity varied with the concentration changing of conductive particles

图7 视电阻率随导电离子浓度改变的变化曲线
Fig.7 Curve of apparent resistivity varied with the concentration changing of conductive particles

图8 视电阻率随地下低阻流体上升的变化曲线<br/>Fig.8 Curve of apparent resistivity varied with the rising of high-conductivity fluid

图8 视电阻率随地下低阻流体上升的变化曲线
Fig.8 Curve of apparent resistivity varied with the rising of high-conductivity fluid

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备注

引言

1 台站概况

3 观测结果分析

4 有限元数值分析

5 计算结果

6 结论与讨论

期刊信息