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Spatial analyses on seismo-ionospheric anomalies of total electron content before the 6 February 2023 M7.8 and M7.5 Turkey Earthquakes

Authors

Liu,  Jann-Yenq
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wen,  Yun-Cheng
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chen,  Yuh-Ing
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chang,  Fu-Yuan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Cheng,  Ching-Chung
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chao,  Chi-Kuang
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Liu, J.-Y., Wen, Y.-C., Chen, Y.-I., Chang, F.-Y., Cheng, C.-C., Chao, C.-K. (2023): Spatial analyses on seismo-ionospheric anomalies of total electron content before the 6 February 2023 M7.8 and M7.5 Turkey Earthquakes, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4362


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021795
Abstract
On 6 February 2023 at 01:17 UTC, an M7.8 earthquake occurred in South-Eastern Turkey (37.2°N 37.0°E, 10.0 km depth), and several strong aftershocks have also been observed in the region, notably a magnitude M7.5 (38.0°N 37.2°E, 10 km depth) at 10:24 UTC the same day. Spatial analyses of the total electron content (TEC) of the global ionosphere map (GIM) are employed to observe the latitude-longitude distributions of seismo-ionospheric anomalies (SIAs) during January-February 2023. A global search of 5183 (=73x71) lattices shows that SIAs of significant TEC increases specifically appear near the epicenter on day 24-22 (12-16 January) and 2-0 (4-6 February) before the two earthquakes. The ion density and ion velocity measured by the science payload of Advanced ionospheric Probe (AIP) onboard the FORMOSAT-5 (F5) satellite and the EIA (equatorial ionization crest) distances between northern and southern hemispheres of GIM TEC are used to find the ionospheric electric fields over the epicenter area during the two periods of 12-16 January and 4-6 February 2023.https://earthquake.usgs.gov/earthquakes/eventpage/us6000jllzhttps://earthquake.usgs.gov/earthquakes/eventpage/us6000jlqa