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Article Dans Une Revue Remote Sensing Année : 2024

Analysis of Pre-Seismic Ionospheric Disturbances Prior to 2020 Croatian Earthquakes

Résumé

We study the sub-ionospheric VLF transmitter signals recorded by the Austrian Graz station in the year 2020. Those radio signals are known to propagate in the Earth-ionosphere waveguide between the ground and lower ionosphere. The Austrian Graz facility (geographic coordinates: 15.46 • E, 47.03 • N) can receive such sub-ionospheric transmitter signals, particularly those propagating above earthquake (EQ) regions in the southern part of Europe. We consider in this work the transmitter amplitude variations recorded a few weeks before the occurrence of two EQs in Croatia at a distance less than 200 km from Graz VLF facility. The selected EQs happened on 22 March 2020 and 29 December 2020, with magnitudes of M w 5.4 and M w 6.4, respectively, epicenters localized close to Zagreb (16.02 • E, 45.87 • N; 16.21 • E, 45.42 • N), and with focuses of depth smaller than 10 km. In our study we emphasize the anomaly fluctuations before/after the sunrise times, sunset times, and the cross-correlation of transmitter signals. We attempt to evaluate and to estimate the latitudinal and the longitudinal expansions of the ionospheric disturbances related to the seismic preparation areas.

Domaines

Volcanologie
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Dates et versions

insu-04439660 , version 1 (05-02-2024)

Identifiants

Citer

Mohammed Y Boudjada, Pier F Biagi, Hans U Eichelberger, Giovanni Nico, Patrick H. M. Galopeau, et al.. Analysis of Pre-Seismic Ionospheric Disturbances Prior to 2020 Croatian Earthquakes. Remote Sensing, 2024, 16 (3), pp.529. ⟨10.3390/rs16030529⟩. ⟨insu-04439660⟩
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