Abstract

Abstract —Examples of two geodynamically active regions in Central Mongolia are used to demonstrate the radon and tectonic activities of faults and find out how their individual parameters affect the radon field. In general, the radon activity of faults increases with the higher contribution of extension in dynamic faulting conditions, with stronger seismic activity, and also in concentrated disjunctive structures at their late evolution stages compared to wide rupture zones at the initial formation stages of their internal structure. Nonuniform structure is an intrinsic property of near-fault radon anomalies, which is defined primarily by nonuniform disruptions of the substrate in the fault zone by ruptures and by spatial variations in the displacement amplitude. Taking the established regularities into account will facilitate a higher efficiency of emanation surveys in studies of seismic hazard associated with crustal faults.

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