Exploring electromagnetic noise suppression technologies for magnetotelluric sounding in high-interference ore districts
Magnetotelluric sounding(MT)has been extensively applied in mineral resource exploration.However,strong anthropogen-ic electromagnetic interference severely constrains the acquisition of high-quality original MT data.This study provided a detailed sum-mary of the common types of electromagnetic noise sources in China and analyzed the characteristics of electromagnetic noise they pro-duced.By comparing the methods for MT electromagnetic noise reduction at home and abroad,this study developed a rapid and effec-tive construction and processing technology for MT data denoising in high-interference ore districts based on actual production demands.The results indicate that Robust processing,remote reference technique,and manual selection are effective and necessary in enhancing MT data quality.Besides,theoretical calculations suggest that the distance between the remote reference stations should be set at 3.56-fold skin depth or above,as verified by the MT experiments in the ore district of the Hongze salt basin,Jiangsu Province.
magnetotelluric sounding(MT)electromagnetic noisedenoisingremote reference methodore concentration area
万方数据
维普
