Depth to the Bottom of Lithospheric Magnetic Sources in Mongolia

We estimate the depth to the bottom of lithospheric magnetic sources for the territory of Mongolia based on the global lithospheric magnetic field EMAG2v3 model using a centroid method. The obtained results are compared with independent geophysical data and a distribution of epicenters of regional earthquakes with ≥ 5.0 for the observation period of 1900-2023. It has been found that the shallowest depths to the bottom of the lithospheric magnetoactive layer (35 km) are observed to the east of 105° E. Therefore, the lithospheric magnetoactive layer is within the crust under the considered territory. A negative correlation between the Moho depth and the depth to the bottom of lithospheric magnetic sources is traced and there is a positive correlation between the lithospheric thickness and the depth to the bottom of lithospheric magnetic sources. We also demonstrate in this study that sources of the most earthquakes with ≥ 6.0, recorded in 1900-2023, are nucleated in the areas in which a sharp change (>5 km) in the magnetoactive layer thickness is observed.