A case of correlation between Rn anomalies and seismic activity on a volcano (Vulcano Island, Southern Tyrrhenian Sea)

A factor of 10 increase in the Rn concentration in a shallow aquifer forefunning a shallow seismic swarm was observed at the island of Vulcano (Aeolian island arc). The peak of Rn anomaly preceded by about one month the seismic swarm, which had a cumulative magnitude of 2.1. The time lag between the two phenomena is much longer than expected, given the small energy released by the swarm. The observed phenomena may not have a direct cause-effect relationship, but they both can be a consequence of volcanic phenomena.

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