Please use this identifier to cite or link to this item: http://hdl.handle.net/10174/16456

Title: Analysis of observations backing up the existence of VLF and ionospheric TEC anomalies before the Mw6.1 earthquake in Greece, January 26, 2014
Authors: Sanchez-Dulcet, F.
Rodríguez-Bouza, M.
Silva, H.G.
Herraiz, M.
Bezzeghoud, M.
Biagi, P.F.
Editors: Biagi, Pier Francesco
Tramutoli, Valerio
Keywords: Lithosphere–atmosphere–ionosphere coupling
Earthquake precursors
Very-low-frequency radio transmissions
TEC anomaly
Issue Date: 28-Aug-2015
Publisher: Elsevier B.V.
Citation: Sanchez-Dulcet F., M. Rodríguez-Bouza, H.G. Silva, M. Herraiz, M. Bezzeghoud, and P.F. Biagi, 2015. Analysis of observations backing up the existence of VLF and ionospheric TEC anomalies before the Mw6.1 earthquake in Greece, January 26, 2014. Physics and Chemistry of the Earth, 85–86, 150–166 (Available online 28 August 2015) http://dx.doi.org/10.1016/j.pce.2015.07.002
Abstract: The present work integrates ground-based ionosphere measurements using very-low-frequency radio transmissions with satellite measurements of the total electron content to draw common conclusions about the possible impact that the Mw6.1 earthquake that took place in Greece on January 26, 2014, had on the ionosphere. Very-low-frequency radio signals reveal the existence of an ∼4-day anomaly in the wavelet spectra of the signals received inside the earthquake preparation zone and a significant increase in the normalized variance of the signals prior to the earthquake (approximately 1 day before). Through total electron content analysis, it was possible to identify a clear anomaly from 15:00 until 20:00 UT on the day before the earthquake that appears again on the day of the earthquake between 07:00 UT and 08:00 UT. The anomalous values reach TEC∗Sigma ∼4.36 and 3.11, respectively. Their spatial and temporal distributions give grounds to assume a possible link with the earthquake preparation. The geomagnetic, solar and weather conditions during the considered period are presented and taken into account. This work is an initial and original step towards a multi-parameter approach to the problem of the possible earthquake-related effects on the ionosphere joining observations made from both ground stations and satellites. A well-founded knowledge of these phenomena is clearly necessary before dealing with their application to earthquake prediction purposes.
URI: http://dx.doi.org/10.1016/j.pce.2015.07.002
http://hdl.handle.net/10174/16456
Type: article
Appears in Collections:ICT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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