Atmospheric electrical field decrease during the M=4.1 Sousel earthquake (Portugal)

Hugo Silva

doi:10.5194/nhess-11-987-2011

Atmospheric electrical field decrease during the M=4.1 Sousel earthquake (Portugal)

2011-03-28

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DOI：10.5194/nhess-11-987-2011

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In this paper, we report the observation of a significant decrease of the vertical component of the atmospheric electrical field in the Evora region (Portugal) during the M = 4.1 Sousel earthquake of 27 March 2010. The epicentre of the earthquake was 52 km from the observation site, which falls within the theoretical earthquake preparation radius. A simple interpretation based on hypothetical radon emissions is presented, and future experiments required to elucidate these observations are outlined. To our knowledge, this is the first reported observation of a decrease of the atmospheric electrical field preceding an earthquake.

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Atmospheric electrical field decrease during the M=4.1 Sousel earthquake (Portugal)

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