Radon anomalies preceding earthquakes which occurred in the UK, in summer and autumn 2002

Crockett, R.G.M., Gillmore, G.K., Phillips, P.S., Denman, A.R. and Groves-Kirkby, C.J. (2006) Radon anomalies preceding earthquakes which occurred in the UK, in summer and autumn 2002. Science of the Total Environment, 364(1-3), pp. 138-148. ISSN (online) 0048-9697

Abstract

During the course of an investigation into domestic radon levels in Northamptonshire, two hourly sampling real-time radon detectors were operated simultaneously in separate locations 2.25 km apart in Northampton, in the English East Midlands, for a 25-week period. This period of operation encompassed the period in September 2002 during which the Dudley earthquake (magnitude – 5.0) and smaller aftershocks occurred in the English West Midlands, UK. We report herein our observations regarding the occurrence of simultaneous short-period radon anomalies and their timing in relation to the Dudley, and other, earthquakes which occurred during the monitoring period. Analysis of the radon time-series reveals a short period when the two time-series displayed simultaneous in-phase short-term (6–9 h) radon anomalies prior to the main Dudley earthquake. Subsequent investigation revealed that a similar period occurred prior to another smaller but recorded earthquake in the English Channel.

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