摘要
根据多年来在中国西北地区进行大地电磁测深工作的实践 ,从仪器、野外地形和干扰因素 3个方面探讨了测点的布设条件 .对仪器的布设方式进行了分析 ;分析了山区和盆地大地电磁测深资料的差异 ,提出了测点布设应注意的问题 ;给出了 2个测点受电磁干扰的具体资料 ,和避开干扰源重新选择测点的观测效果 .认为仪器抗干扰能力是有限度的 ,如果干扰信号和大地电磁频谱相接近 。
On the basis of magnetotelluric sounding practice in northwestern China since many years,arrangement condition of observation point is discussed from observation instrument,topography and interference factor.The arrangement pattern of electrode in field observation is analysed. Analysing the difference between observation data in mountain area and that in basin, some suggestions on arrangement condition of the observation points are made.The data disturbed by electromagnetic noises of two observation points are showed.Observing effect at the point which is reselected distant from interference source is better.It is considered if frequency of interference signal is close to that of magnetotelluric sounding signal,it will be difficult for instrument to restrain the interferences by oneself because resistance of the instrument to interferences is limited.
出处
《西北地震学报》
CSCD
北大核心
2001年第1期78-81,共4页
Northwestern Seismological Journal
基金
中国地震局兰州地震研究所论著!编号:LC2 0 0 10 0 3
关键词
大地电磁测深
干扰排除
测点布设
观测仪器
Northwest China
Telluric electromagnetic sounding
Interference elimination
Observation point position
