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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

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

Fig. 7

The visibility of infrasound signals (InfVis) at NRV evaluated by the wind data at the OLLETA weather station close to ACOLM (a) and by the infrasound data at ACOLM (b), ACINM (c), and ACRUM (d). a The daily fraction of wind speed data smaller than the threshold values of 2 m/s (green), 4 m/s (blue), and 8 m/s (pink). b–d The InfVis is shown by blue, and the periods of missing data are shaded. The events to which the associated infrasound signals are detected and failed at the individual station are indicated with the magenta triangles and the black crosses, respectively (see Additional file 2: Table S2.1). The green circles are the unconfirmed events (see Additional file 2: Table S2.2). The blue arrows at the bottom show the periods of low infrasound activity, confirmed by the high InfVis

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