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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

From: Continuous monitoring of the 2015–2018 Nevado del Ruiz activity, Colombia, using satellite infrared images and local infrasound records

Fig. 6

a–c The maximum cross-correlation coefficient (MaxCrr) and the median of the mean square (MedMS) in 200-s long time windows. Coral and medium purple dots correspond to the data from the Chaparral sensor (C) and the Hakusan sensor (H), respectively. On the values of the Chaparral sensors in the time windows corresponding to the reported eruption event times, whether infrasound detection is failed or successful by the black crosses (failed) and the magenta triangles (detected), respectively. The green triangles indicate the eruptions which have not been confirmed by cameras or reports. d–f Histograms of the events for MedMS. The reported events without and with infrasound detection and the infrasound signals without eruption reports are distinguished by black, magenta, and green colors. The individual counts are shown with the colored numbers besides the bars. The failed case counts only the events with the ash plume heights larger than 200 m. Results are shown for ACOLM (a, d), ACINM (b, e), and ACRUM (c, f)

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