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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

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

Fig. 4

a The visibility of thermal anomaly (ThVis) at NRV. b, c The accepted data points from the 11-μm band (open green circles) and the values from the 3.9-μm band showing significant thermal anomalies (red circles) at NRV (b) and NTV (c). The analysis was made from August 1, 2015, to November 30, 2018. The upper red arrows in b mark the three periods (P1, P2, P3) of high thermal anomalies at NRV

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