华东地区4个强电流源地电场信号的空间变化特征

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS 地球物理学报 Pub Date : 2017-01-01 DOI:10.1002/CJG2.30024
Ma Qin-zhong, Qian Jia-dong, Li Wei, Zhao Wenzhou, Fang Guoqing
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引用次数: 2

摘要

在地震电磁学地电场研究中,电流的流动特性与地质构造的关系是一个非常重要的问题。本文讨论了从四种不同来源注入地下的强电流及其对与之相关的地电场站网观测结果的影响,为我们研究这些问题提供了一个很好的机会。源为华东华南地区环上海地区(华东地区)部分高压直流输电线路系统变电站的接地电极,注入电流为1200 ~ 4780A。在同一地区的8个地电场站采集了与电流相对应的地电场附加信号记录。在研究中可以看到以下特点。有些电台表现出选择性效应。不同台站记录的附加地电场大小不同,如浦东台站在所有强电流源附近,但只记录到南桥地电极的清晰信号,而没有记录到其他(同里、华新和奉贤县)地电极的信号,这显示了站点的选择性效应;②站源距离效应。最大观测距离为350公里,超过这个距离就无法再记录到震源发出的地电信号;③源方位角确定具有复杂的特点。例如,在崇明站,由同里和新华大地电极信号确定的实际和计算源方位角之间的误差最小,分别只有0.2°和0.8°。青浦站是离大电流源最近的站点,由于一些未知的原因,这些误差比崇明站大;④地电场不均匀性的影响。在研究区各台站,长偶极子与短偶极子的信号之比并不遵循台站下方均质介质结构情况下的规律,说明了一种非均匀性效应,本文对此进行了详细的讨论,并通过研究区二维高密度地电勘探结果进行了验证。⑤极化方向奇特的反向效应。青浦站和崇明站的附加地电场信号在长偶极子和短偶极子上的极化方向相反,需要进一步研究来解释这一现象。本文讨论了点源的配置和站内电极的分布、大面积介质的非均质性以及站内地下介质的精细结构这三个因素的影响,可以比较清楚地解释上述特征。
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CHARACTERISTICS OF THE SPATIAL VARIATION OF GEOELECTRIC FIELD SIGNALS RECORDED AT THE STATIONS IN HUADONG AREA (SOUTH‐EAST CHINA) FROM 4 HEAVY CURRENT SOURCES
The relation between the flowing characteristics of electric current and the geological structure is one of very important issues in the study of geoelectric field in seismo-electromagnetics. This paper deals with heavy currents from four different sources injected into the underground and their consequences in the observations from the network of geoelectric field stations associated with the currents, which provides us with a good opportunity to study the issues. The sources are the earth electrodes of some substations of HVDC transmission line systems in East-south China around Shanghai area (Huadong area) with the currents of 1200 to 4780A injected. The recordings of the additional signals of geoelectric field corresponding to the currents have been collected at eight geoelectric field stations in the same area. The following features could be seen in the study. ① Some stations show the selectivity effect. The magnitude of the additional geoelectric field recorded at different stations varied from one source to another, for example Pudong station is near all the heavy current sources, but only the clear signals originated from Nanqiao earth electrode were recorded while no signals from other sources (Tongli, Huaxin, and Fengxian), which shows so-called selectivity effect of the site; ② Station-source distance effect. The maximum observation distance is 350 km, beyond that no additional geoelectric signals from the sources could be recorded; ③ The source azimuth determination has complicated characteristics. For example, at Chongming station the errors are minimum, only 0.2° and 0.8°, respectively, between the actual and calculated source azimuths determined by the signals from Tongli and Xinhua earth electrodes. However, Qingpu station is the nearest station from the heavy current sources, these errors are larger than that obtained from Chongming station due to some unknown reasons; ④ The effect of non-uniformity of the geoelectric field. At the stations in the studied area, the ratios of signals from long dipole over that of short dipoles do not follow the regular patterns which appear in the cases of homogeneous medium structure underneath the observation stations, which illustrates a kind of non-uniformity effect, which is discussed in detail in this paper and proved by the results from a 2-D high density geoelectrical prospecting in the studied area. ⑤ The peculiar reverse effect of polarization direction. For the additional geoelectric field signals recorded at Qingpu and Chongming stations the polarization directions on the long diploes and short diploes are reverse, which need to be further studied in the future to explain the phenomenon. The influence of the three factors, i.e., the configuration of a point source and the electrode distribution of station, the heterogeneity of medium in a large area, as well as the fine structure of the underground medium at a station, is discussed in this paper which might give a relatively clear explanation for the features mentioned above.
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地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
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