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found to be <1,000 Bq/m3 (9–11), whereas in areas of stronger soil degassing radon activity was up to 60,000 Bq/m3 (12). Anomalous soil degassing is particularly strong in the east and southwest flanks of the volcano, that are characterized by continuous tectonic deformations and gravitational collapses (9, 13–15). The collapsing flanks are bordered by numerous active faults (10, 16–19), sometimes revealed from radon in-soil investigations (11, 12, 20–22), and many of these faults cross urban areas (Figure 1).
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The health hazards of volcanoes and geothermal areas - PMC (nih.gov)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2078062
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