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Geoscience Letters

Official Journal of the Asia Oceania Geosciences Society (AOGS)

Fig. 4 | Geoscience Letters

Fig. 4

From: Spatial analyses on pre-earthquake ionospheric anomalies and magnetic storms observed by China seismo-electromagnetic satellite in August 2018

Fig. 4

Z values of a positive and b negative anomalies, and c median values of ∆TEC (= TEC observation−reference) at the fixed location (7.5°N, 115.0°E) 30 days before and after the 123 M ≥ 6.0 earthquakes. ∆TEC is in a TEC unit (TECu = 1 × 1016 #/m2). Red and blue/black contours denote z test results of positive and negative anomalies with significant level < 0.05, respectively. Note that TEC positive anomalies with significant level < 0.05 appear at 05:00–09:00 UT day 4 before the earthquakes (red rectangular frame of Zone A)

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