EGU2020-13952, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-13952
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Investigation Of Pre-Earthquake Ionospheric Anomalies Before Albania 2019 Earthquake Using The Romanian Receivers Of The Vlf/Lf Infrep And Gnss Global European Networks

Iren Adelina Moldovan1, Victorin Emilian Toader1, Christina Oikonomou2, Haris Haralambous2, Pier Francesco Biagi3, Alexandra Muntean1, Andrei Mihai1, and Aakriti Khadka4
Iren Adelina Moldovan et al.
  • 1NATIONAL INSTITUTE FOR EARTH PHYSICS, RESEARCH DEVELOPMENT AND INNOVATION IN EARTH SCIENCES, Magurele, Romania (irenutza_67@yahoo.com)
  • 2Frederick University, Filokyprou St.7, Palouriotisa, Nicosia, 1036, Cyprus
  • 3Università di Bari, Physics Department, Bari, Italy
  • 4Department of Civil Engineering, Pulchowk Campus, Institute of Engineering Tribhuvan University, Pulchowk, Lalitpur, Nepal

The last two decades a significant effort has been invested in order to understand and interpret the link between seismic activity and ionospheric perturbations. Since not any individual seismo-ionospheric precursor can be used as an accurate stand alone for earthquake prediction it is required to integrate different kinds of precursors and analysis techniques.

To this context, the aim of this study is to investigate pre-earthquake ionospheric anomalies that occurred prior to large 6.4 Mw earthquake in Albania (26th November 2019), following a multi-instrument and multi-technique approach, using subionospheric radio VLF/LF signals obtained from the Romanian receivers of the INFREP European network and Total Electron Content (TEC) observations from GNSS global network.

To identify possible ionospheric anomalies before the earthquakes we applied the terminator time and nighttime fluctuation methods on the amplitude of subionospheric LF radio signals and spectral analysis on diurnal TEC variations several days prior the seismic event. It was found that sunrise terminator times are delayed approximately 20-40 min few days before and during the earthquake day. Intensified wave-like TEC oscillations with periods around 20 min were also revealed up to 5 days prior to the earthquake shocks in all cases that could be interpreted as possible ionospheric precursors of the impending earthquakes.      

How to cite: Moldovan, I. A., Toader, V. E., Oikonomou, C., Haralambous, H., Biagi, P. F., Muntean, A., Mihai, A., and Khadka, A.: Investigation Of Pre-Earthquake Ionospheric Anomalies Before Albania 2019 Earthquake Using The Romanian Receivers Of The Vlf/Lf Infrep And Gnss Global European Networks, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-13952, https://doi.org/10.5194/egusphere-egu2020-13952, 2020

Comments on the presentation

AC: Author Comment | CC: Community Comment | Report abuse

Presentation version 1 – uploaded on 30 Apr 2020
  • CC1: Comment on EGU2020-13952, Michael E. Contadakis, 09 May 2020

     Your findings in relation to the TEC  variation with period 20min at the days of the main shock of Albanian Earthquake of 26/11/2019 are in accordance with our results ( D1651-EGU2020-1527,Figure 9)

  • CC2: Comment on EGU2020-13952, Michael E. Contadakis, 09 May 2020

     Your findings in relation to the TEC  variation with period 20min at the days of the main shock of Albanian Earthquake of 26/11/2019 are in accordance with our results ( D1651-EGU2020-1527,Figure 9)

  • CC3: Comment on EGU2020-13952, Michael E. Contadakis, 09 May 2020

     Your findings in relation to the TEC  variation with period 20min at the days of the main shock of Albanian Earthquake of 26/11/2019 are in accordance with our results ( D1651-EGU2020-1527,Figure 9)

    • AC1: Reply to CC3, Christina Oikonomou, 10 May 2020

      Dear Prof. Contadakis, Thank you very much for your comment. Compliance of our results is increasing our confidence about the existence of ionospheric precursors of earthquake. Our work is on Albania earthquake is still ongoing and we will be happy to discuss with you any new result in the future.

  • CC4: Comment on EGU2020-13952, Michael E. Contadakis, 09 May 2020

     Your findings in relation to the TEC  variation with period 20min at the days of the main shock of Albanian Earthquake of 26/11/2019 are in accordance with our results ( D1651-EGU2020-1527,Figure 9)