Analysis of observations backing up the existence of VLF and ionospheric TEC anomalies before the Mw6.1 earthquake in Greece,January 26, 2014 |
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| Affiliation: | 1. Department of Physics of the Earth, Astronomy and Astrophysics I, Facultad de Ciencias Físicas, University Complutense of Madrid (UCM), Ciudad Universitaria, Plaza de Ciencias 1, 28040 Madrid, Spain;2. Departamento de Física, ECT, Instituto de Ciências da Terra, Universidade de Évora, Rua Romão Ramalho 59, 7002-554 Évora, Portugal;3. Atmospheric Chemistry Research Group, University of Bristol, Cantock’s Close, Bristol BS8 1TS, UK;4. Institute of Geosciences (UCM, CSIC), Ciudad Universitaria, Calle José Antonio Novais 12, 28040 Madrid, Spain;5. Department of Physics, University of Bari, Campus Universitario “Ernesto Quagliariello”, Vía G. Amendola 173, 70126 Bari, Italy;1. School of Mathematics and Statistics, Zhengzhou University, Zhengzhou 450001, China;2. College of Applied Sciences, Beijing University of Technology, Beijing 100124, China;3. School of Mathematics and Statistics, University of New South Wales, Sydney 2052, Australia;1. Indian Institute of Geomagnetism (DST), Navi Mumbai 410218, India;2. National Geophysical Research Institute, Uppal Road, Hyderabad 500007, India;3. Université Côte d’Azur, OCA, CNRS, IRD, Géoazur, Sophia-Antipolis, Valbonne, France;1. National and Kapodistrian University of Athens, Athens, Greece;2. University Of West Attica, Athens, Greece;1. Laboratory of Nanotechnology on Surfaces, Instituto de Ciencia de Los Materiales de Sevilla (CSIC-Universidad de Sevilla), Avda. Américo Vespucio 49, 41092 Sevilla, Spain;2. Chemistry Department, Cambridge University, Cambridge CB2 1EW, United Kingdom;1. CNRS UMR 5150, Laboratoire des Fluides Complexes et leurs reservoirs, Université de Pau et des Pays de l’Adour, BP 1155, 64013 Pau Cedex, France;2. Centre Scientifique et Technique Jean Feger, Total, Avenue Larribau, 64018 Pau Cedex, France;1. Institute of Space Science, National Central University, Chung-Li, Taiwan;2. Center for Space and Remote Sensing Research, National Central University, Chung-Li, Taiwan;3. National Space Program Origination, Hsin-Chu, Taiwan;4. Department of Earth Science, National Cheng Kung University, Tainan, Taiwan |
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| 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 TEC1Sigma ∼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. |
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| Keywords: | Lithosphere–atmosphere–ionosphere coupling Earthquake precursors Very-low-frequency radio transmissions TEC anomaly |
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