Geophysics and Geophysical Exploration ISSN:1229-1064(Print) 2384-051X(Online) 지구물리와 물리탐사

This study proposes an optimal borehole location through the joint inversion of multiple spatial magnetic datasets, comprising ground-based magnetic data and single-borehole magnetic measurements. A horizontal disk model was introduced to systematically investigate the effect of borehole location on inversion performance. To quantitatively assess the accuracy of the inversion results, the target boundary was determined using the method proposed by Otsu (1979). The similarities between the inverted and true disk models were quantitatively evaluated by employing a confusion matrix-based analysis. The quantitative joint inversion analysis, which systematically incorporates variations in borehole location, geomagnetic declination, and inclination angles demonstrates that the optimal borehole configuration for magnetic exploration in the Northern Hemisphere is attained when the borehole azimuth is precisely aligned with the geomagnetic declination direction. This result provides a practical criterion for borehole placement in field applications, in which the number of boreholes is often constrained by economic factors. Therefore, the proposed approach is expected to enhance the efficiency of magnetic anomaly detection in practical field environments.