摘要
应用平凉台地电场NS、EW方位大地电场的分钟值,其矢量合成结果表明,该场地的大地电场强度、方向变化都具有日周期性,并且其方位与应用潮汐谐波振幅计算的岩体裂隙优势方位α角一致。在该场地,来自空间的磁暴干扰对α角的计算结果基本不产生影响;模拟加入脉冲、电阻率观测人工供电、地铁等典型干扰,在干扰幅度小于平凉台日变波峰值时,α角的计算结果基本不受影响;模拟加入直流阶跃干扰时,干扰加入当天会影响α角的计算结果,但从第2天起不再影响α角的计算结果。
Using telluric field minute values of EW and NS directions at Pingliang station,the vector synthesis results show that the telluric field intensity and direction variations were characterized by daily period.The direction is consistent with the rock cracks（αangle）of the preferred orientation calculated with tidal harmonic amplitudes.At this site,magnetic storm interferences from space have little effect on the calculation results ofα.The typical interferences of pulse,manual power supply of resistivity observation and subway were simulated and analyzed.The results show that the calculations ofαare unaffected,basically,when the disturbance amplitudes are less than the peak values of diurnal variation at Pingliang station.When direct current step disturbance was added,the calculation ofαis affected on the same day,but no longer affected from the second day.
出处
《地震》
CSCD
北大核心
2017年第4期112-122,共11页
Earthquake
基金
中国地震局监测预报司2016年度任务专项项目(16A28ZX116
16A28ZX117)资助
关键词
地电场
典型干扰
裂隙优势方位
Geoelectric field
Typical interferences
Preferred orientation of cracks
