Ionospheric activity and possible connection with seismicity: Contribution from the analysis of long time series of GNSS signals |
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| Institution: | 1. DICATECh, Technical University of Bari, Via Orabona 4, 70125 Bari, Italy;2. BIGEA, University of Bologna, Via Zamboni 33, 40126 Bologna, Italy;3. DICAM, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy;1. DICATECh, Technical University of Bari, Via Orabona 4, 70125 Bari, Italy;2. BIGEA, University of Bologna, Via Zamboni 33, 40126 Bologna, Italy;3. DICAM, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy;1. Institut de Physique du Globe de Paris, Paris Sorbonne Cité, Univ. Paris Diderot, UMR CNRS 7154, 39 Rue Hélène Brion, Paris 75013, France;2. Géoazur, Université de Nice Sophia-Antipolis, UMR CNRS 7329, Observatoire de la Côte d''Azur, 250 rue Albert Einstein, Sophia Antipolis, 06560 Valbonne, France |
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| Abstract: | The modifications of some atmospheric physical properties prior to a high magnitude earthquake were debated in the frame of the Lithosphere Atmosphere Ionosphere Coupling (LAIC) model. In this work, among the variety of involved phenomena, the ionisation of air at the ionospheric levels triggered by the leaking of gases from the Earth’s crust was investigated through the analysis of GNSS (Global Navigation Satellite System) signals. In particular, the authors analysed a 5 year (2008–2012) long series of GNSS based ionospheric TEC to produce maps over an area surrounding the epicentre of the L’Aquila (Italy, Mw = 6.3) earthquake of April 6th, 2009. The series was used to detect and quantify amplitude and duration of episodes of ionospheric disturbances by a statistical approach and to discriminate local and global effects on the ionosphere comparing these series with TEC values provided by the analysis of GNSS data from international permanent trackers distributed over a wider region. The study found that during this time interval only three statistically meaningful episodes of ionospheric disturbances were observed. One of them, occurring during the night of 16th of March 2009, anticipated the main shock by 3 weeks and could be connected with the strong earthquake of 6th of April. The other two significant episodes were detected within periods that were not close to the main seismic events and are more likely due to various and global reasons. |
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| Keywords: | GNSS Total electron content Earthquake Ionospheric precursors |
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