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安徽省地电场日变化特征初步分析

2021-11-28尹天杰赵桂宝孙亮亮张明明

河南科技 2021年16期

尹天杰 赵桂宝 孙亮亮 张明明

摘 要:通过对安徽省蒙城和嘉山两个地电场台站的大地电场分钟值资料进行分析,发现安徽省地电场的日变形态较为清晰,呈现出“双峰单谷”或者“单峰双谷”的变化形态;同一方向不同极距变化形态及相位一致,嘉山台日变形态较蒙城台更为平滑;地电场日变化形态特征与地磁场相似,但地磁场日变化形态较为平缓,且地电场相位对比地磁场而言较为滞后;磁暴发生时,地电场有较为灵敏的响应;高压直流输电线路故障是近年来影响地电场日变形态最主要的干扰之一。

关键词:地电场;日变化;地磁场;地电暴;高压直流输电

中图分类号:P319.3文献标识码:A文章编号:1003-5168(2021)16-0138-03

Abstract: Based on the analysis of the minute value data of the geoelectric field at the Mengcheng and Jiashan geoelectric field stations in Anhui Province, it is found that the diurnal variation of the geoelectric field in Anhui is relatively clear, showing the change of double peaks and single valleys or single peaks and double valleys. Shape; the same direction and different pole distances change shape and phase are the same, the daily variation of Jiashan station is smoother than that of Mengcheng station; the characteristics of the diurnal variation of the geoelectric field are similar to the geomagnetic field, but the diurnal variation of the geomagnetic field is more gentle, and the phase compared with the geomagnetic field, it lags behind; when a magnetic storm occurs, the geoelectric field has a more sensitive response; the failure of high-voltage direct current transmission lines has become one of the most important disturbances affecting the daily change of geoelectric field in recent years.

Keywords: geoelectric field;diurnal variation;geomagnetic field;geoelectric storm;high-voltage direct current transmission

地电场观测是目前较为成熟的地震前兆观测手段。在映震和孕震过程中,有较为敏锐的前兆异常变化。对于短临预报,地电场的单日数据变化具有较大的参考意义,但是因为地电场往往会有较为规则的周期日变形态,在开展预测预报工作时,需要剔除正常的日变形态背景,这样才能对前兆异常数据有一个准确的定位[1]。正确识别地电场的日变化特征以及了解各类典型特殊干扰事件下地电场的变化形态,在日常数据预处理以及前兆异常跟踪分析等工作中具有举足轻重的意义。

1 地电场台站概况

安徽省现有蒙城和嘉山两个地电场观测台。蒙城台、嘉山台地电场观测均采用三角形布极方式,即三个方向,两个极距。蒙城臺有NS、EW、N45°W三个方向,NS向和EW向长极距为226 m,短极距为113 m,N45°W向长极距为320 m,短极距为160 m。……

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