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Geoscience Letters

Official Journal of the Asia Oceania Geosciences Society (AOGS)

Fig. 5 | Geoscience Letters

Fig. 5

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

Fig. 5

ROC curves for alarming earthquakes based on precursory information indicated in Fig. 4. Color and red curves denote the ROC curves of the observations and the 95% interval, respectively. The red and blue asterisks denote the best point yielding the maximum R score (= TPR−FPR), which is called the Youden index (Youden 1950). p-value is “zero”

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