关键词: 大地电磁, 远参考观测, 随机噪音, 相关噪音

Abstract: Results of more than thousand filed measurements show that the remote reference technique is a powerful tool for improving the MT data quality, especially for the noisy environment. Experiments indicate that a reasonable spacing between the local station and the reference station is important for different frequency bands. For high frequency band 10～20km is better. For middle frequency band 50～100km is reasonable. For low frequency band the spacing should be greater than 100km.

Key words: Magnetotelluric, Remote reference, Random noise, Coherent noise