Articles | Volume 11, issue 3
https://doi.org/10.5194/nhess-11-987-2011
© Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License.
Special issue:
Research article
| 
28 Mar 2011
Research article |
| 28 Mar 2011
Atmospheric electrical field decrease during the M = 4.1 Sousel earthquake (Portugal)
Abstract. In this paper, we report the observation of a significant decrease of the vertical component of the atmospheric electrical field in the Évora 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.
