Effect of evaluation frequency separation on magnetotelluric resolution

Ujjal Borah, Prasanta Patro
2017 Annals of Geophysics  
Aiming at the resolution enhancement of the subsurface objects, an evaluation (target) frequency separation criterion is proposed for magnetotelluric (MT) method. The proposed idea is based on the propagation geometry of diffused electromagnetic (EM) wave through the earth. Starting from a homogeneous medium and extended it to layered earth model, the present study proposed the frequency separation criterion in terms of apparent resistivity and the lowest frequency to be used. To apply the
more » ... . To apply the proposed idea in real situation the frequency separation criterion is reduced to a convenient form which is expressed in terms of the lowest frequency only. The effectiveness of the proposed condition is examined by applying it to synthetic data. The result shows that the new idea can improve the resolution of the subsurface objects. gh SHORE project PSC0205 (BPKP) to CSIR-NGRI, Hyderabad. Thanks to the director, CSIR-NGRI for his support and encouragement during the study. Thanks to the anonymous reviewer for his constructive suggestions.
doi:10.4401/ag-7056 fatcat:37ammnehevbytbwuiyuyhv4w6q