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Geoscience Letters

Official Journal of the Asia Oceania Geosciences Society (AOGS)

Fig. 7 | Geoscience Letters

Fig. 7

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

Fig. 7

Global distributions of significant anomalies at post-noon and post-midnight a–d Ne/Ni, e–h Te/Ti. Red stars denote the epicenter of the 5 August 2018 M7.0 earthquake. The top count of the anomalies associated with i the M7.0 earthquake, j M6.s earthquakes, and k the M7.0 + M6.s earthquakes. It can be seen that in (k), the anomalies in the post-noon Ne, Ni, Te, and Ti, and post-midnight Ni concurrently appear right above the epicenter. The anomalies in Ne/Ni and Te/Ti are defined as greater than the median, 50%, and lower than the first quartile, 25%, respectively

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