Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-39
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
16 Feb 2017
Review status
A revision of this discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
On a reported effect in ionospheric TEC around the time of the 6 April 2009 L'Aquila earthquake
Fabrzio Masci1, Jeremy N. Thomas2,3,4, and Jim A. Secan2 1Istituto Nazionale di Geofisica e Vulcanologia, L'Aquila, Italy
2NorthWest Research Associates, Redmond, Washington, USA
3Department of Electrical and Computer Engineering, DigiPen Institute of Technology, Redmond, Washington, USA
4Department of Earth and Space Sciences, University of Washington, Seattle, Washington, USA
Abstract. In a report published in Advances in Space Research, Nenovski et al. (2015) analyse ionospheric TEC data from GPS measurements around the time of 6 April 2009 Mw6.1 L'Aquila (Italy) earthquake. According to the authors, TEC difference (DTEC) calculated from two GPS receivers in central Italy shows a hump-like shape (an increase followed by a decrease) during the hours just before and shortly after the main shock. They maintain that the hump-like shape is anomalous and may be explained as related to the earthquake. We show that the DTEC increase the hours before the shock, as well as its subsequent slow decrease, do not have any characteristic that might support a possible relationship with the earthquake. We have also conducted our own independent analysis using the same GPS data analysed by Nenovski et al. (2015). We have found a daily modulation in DTEC time series that shows hump-like shapes like that reported by Nenovski et al. (2015) throughout the investigated period. This demonstrates that the hump-like shape in DTEC close to the time of the 6 April earthquake is not anomalous and cannot be considered a possible earthquake-related effect.

Citation: Masci, F., Thomas, J. N., and Secan, J. A.: On a reported effect in ionospheric TEC around the time of the 6 April 2009 L'Aquila earthquake, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-39, in review, 2017.
Fabrzio Masci et al.
Fabrzio Masci et al.
Fabrzio Masci et al.

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Short summary
In a recent paper, the authors report the analysis of ionospheric TEC data from GPS measurements around the time of 6 April 2009 L'Aquila earthquake. According to them, an anomalous change in TEC difference from two GPS receivers in central Italy may be explained as related to the earthquake. We have conducted our own independent analysis using the same GPS data. We have shown that in TEC difference there is no evidence of actual seismogenic effects close to the time of L'Aquila earthquake.
In a recent paper, the authors report the analysis of ionospheric TEC data from GPS measurements...
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