Comparative Assessment of Radon Activity for Different Fault Types and Scale Ranks in the Baikal Rift and South of the Siberian Platform

摘要

This study deals with the problem of measuring radon activity (Q) for a series of structurally well-studied faults and determining patterns of radon activity variation over a range of scale for different morphoge-netic types of faults in relation to tectonic activity along the faults. That radon anomalies in fracture zones define substrate permeability has long been appreciated; however, the relationship between the intensity of radon anomalies and the fault type over a range of scales remains obscure. Previous studies 1-7 dwelt upon increased radon activity in the vicinity of major tectonic disjunctions as well as seismically active faults with the most intensive emissions along dislocations. In relation to dynamic settings, the radon exhalation rate is known to be higher in zones of extension as compared to compression 8; however, studies of deep normal faults and strike-slip faults point to minor differences in the associated emanation anomalies 9.