Abstract

Detailed monitoring of radon (Rn) flux in gravel was carried out for a period of eight years near the active Dead Sea rift fault. The temporal relationship between hundreds of weak earthquakes (4.6 ≥ ML ≥ 0) and Rn flux signals was tested for time intervals related to the start time of 110 Rn flux signals. Earthquakes located within three pull-apart grabens of the Dead Sea rift valley were found to occur preferentially within the time interval of the first 3 days after the start time of 110 Rn anomalies, and the excess of earthquakes (82% relative to the expected value) is highly significant (p = .003%). However, a similar relationship is not found in the two weeks preceding or following the start time of the Rn anomalies for earthquakes occurring within the Dead Sea rift in structurally higher segments, or out of the Dead Sea rift.

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