Some considerations on the use of Total Electron Content for the discrimination of possible electronic density earthquake-induced anomalous values in the ionosphere

• Sánchez-Dulcet, Francisco ^[1] ; Herráiz Sarachaga, Miguel ^[2] ; Rodríguez-Caderot, Gracia ^[1] ; González-López, Alicia ^[1] ; Rodríguez-Bouza, Marta ^[1]
  1. [1] Universidad Complutense de Madrid

     Universidad Complutense de Madrid

     Madrid, España

     
  2. [2] Departamento de Física de la Tierra y Astrofísica. Universidad Complutense, Madrid; Instituto de Matemática Interdisciplinar (imi). Universidad Complutense, Madrid.
• Localización: 10.ª Asamblea Hispano-Portuguesa de Geodesia y Geofísica: artículos, 2023, ISBN 978-84-416-7540-7, págs. 643-653
• Idioma: inglés
• Enlaces
  • Texto Completo Libro
• Resumen

  • In the last two decades, the attention paid to the possible influence of earthquakes on the ionosphere has increased exponentially. The use of GNSS derived data has played a decisive role in this development and many of the recent studies are based on the detection and analysis of Total Electron Content, TEC, anomalies that can be attributed to the seismic process. The methodologies adopted with this aim are very different and the election of the way the TEC is processed has a decisive influence on their efficiency. This work studies three parameters directly related to this subject: Nd, vTECREL, and vTEC*Sigma. The first one, Nd, indicates the number of undisturbed days before the earthquake which are used to estimate the mean value of the Vertical Total Electron Content, vTECM. In turn, vTEC*Sigma and vTECREL express the relative values of the observed variation in two different ways as they are scaled by the standard deviation and by the mean value, respectively. The analysis is applied in the context of the Mw 6.1 Cephalonia 2014 earthquake, adopted as a case study. The results point that Nd can be significantly diminished without affecting the vTEC*Sigma and vTECREL results and that vTEC*Sigma seems to be more recommendable than vTECREL for the analysis of anomalies related to seismic processes due to its stability when Nd diminishes.

• Referencias bibliográficas
  • Artru, J., V. Ducic, H. Kanamori, P. Lognonné and M. Murakami (2005): “Ionospheric detection of gravity waves induced by tsunamis”. Geophys....
  • Astafyeva, E. (2019): “Ionospheric detection of natural hazards”. Reviews of Geophysics, 57, doi.org/10.1029/2019RG000668
  • Bolt, B.A. (1964): “Seismic airwaves from the great 1964 Alaskan earthquake”. Nature, 202 (4937), 1095-1096. doi.org/10.1038/2021095a0.
  • Davies, K. and D.M. Baker (1965): “Ionospheric effects observed around the time of the Alaskan earthquake of March 28, 1964”. J. Geophys....
  • Han, S.-C., S. McClusky, T. D. Mikesell, P. Tregoning, and J. Sauber (2022): “Looking to the sky for better tsunami warnings”. EOS, 103. doi.org/10.1029/2022EO220519.
  • Komjathy, A., Y.-M. Yang, X. Meng, O. Verkhoglyadova, A. J. Mannucci, and R. B. Langley (2016): “Review and perspectives: Understanding natural-hazards-generated...
  • Le, H., J. Y. Liu, and L. Liu (2011): “A statistical analysis of ionospheric anomalies before 736 M6.0 earthquakes during 2002– 2010”. J....
  • Liu, J. Y., Chen, Y. I., Chuo, Y. J., and Tsai, H. F (2001): “Variations of ionospheric total electron content during the Chi-Chi earthquake”....
  • Moore, G. (1964): “Magnetic Disturbances preceding the 1964 Alaska earthquake”. Nature, 203 (4944), 508-509. doi.org/: 10.1038/203508b0.
  • Najita, K. and P.C Yuen (1979): “Long-period oceanic Rayleigh wave group velocity dispersion curve from HF Doppler sounding of the ionosphere”....
  • Oikonomou, C., H. Haralambous and B. Muslim (2016): “Investigation of ionospheric TEC precursors related to the M7.8 Nepal and M8.3 Chile...
  • Polyakova, A.S. and N.P. Perevalova (2013): “Comparative analysis of TEC disturbances over tropical cyclone zones in the North-West Pacific...
  • Sánchez-Dulcet, F., M. Rodríguez-Bouza, H.G. Silva, M. Herraiz, M. Bezzeghoud and P.F. Biagi (2015): “Analysis of observations backing up...
  • Stankov, S. M., K. Stegen and R. Warnant (2010): “Seasonal variations of storm-time TEC at European middle latitudes”. Adv. Space Res., 46...
  • Tanaka T., T. Ichinose, T. Okuzawa, T. Shibata, Y. Sato (1984): “HF-Doppler observations of acoustic waves excited by the Urakawa-Oki earthquake...
  • Ulakavak, M. and M. Yalcinkaya (2017): “Precursor analysis of ionospheric GPS-TEC variations before the 2010 M 7.2 Baja California earthquake”....
  • Vijaya Lekshmi, D., N. Balan, S. Tulasi Ram, and J. Y. Liu (2011): “Statistics of geomagnetic storms and ionospheric storms at low and mid...
  • Wessel, P., and W. H. F. Smith (1998): “New, improved version of Generic Mapping Tools released”. EOS Trans. Amer. Geophys. U., 79 (47), pp....