Research on RTP aeromagnetic gradient data and its applicability in different latitudes

摘要

Aeromagnetic gradient data needs to be reduced to the pole so that it can be better applied to geological interpretation through theoretical derivation. In this paper, we conduct research on the morphological characteristics of the total and horizontal gradient modules before and after reduction to the pole and design models at different latitudes, with consistent and inconsistent magneticfi eld direction and geological body magnetization direction. We discuss how to use the total gradient module and horizontal gradient module in geological interpretation. The reduced-to-the-pole (RTP) method is required for the horizontal gradient module method but not for the total gradient module. Finally, the conclusions derived from the theoretical models are verifi ed through analysis of real data. The position determination of a geological body using the total gradient method, gradient data, or total-fi eld data works better without RTP, ensuring data primitive authenticity. However, the horizontal gradient module should be reduced to the pole to determine the boundary of the geological body. Finally, the correction of the designed model is verifi ed by actual data analysis. Both the total and horizontal gradient methods can be applied to geological interpretation.