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

摘要： 介绍了大地电磁方法中远参考观测方式的基本原理。通过实例证明了远参考方式的有效性,并给出了不同频段远参考点和本地测点之间的一个合理的距离。在高频段远参考点至本地点相距10～20km为好,中频段50～100km比较合适;低频段应大于100km.

关键词: 大地电磁, 远参考观测, 随机噪音, 相关噪音