On 19 October, surveillance cameras of the Argentine Geological and Mining Service (SEGEMAR) caught a new eruption at the volcano.
Starting about 04:30 AM local time, constant grey ash emissions have been rising about 200 meters above the crater dissipating southeast as seen in the attached satellite image from Sentinel-2.
Prior to the eruption, real-time seismic amplitude (RSAM) measurements had shown fluctuated periods of volcanic tremor with an increasing trend, which commenced on 18 October at 06:00 PM local time. The tremor suddenly decreased before 04:30 Am local time, just before the eruption, indicating a rise of ash emissions through the edifice’s conduit.
Moreover, a strong thermal anomaly has been detected by the MIROVA platform using the VIIRS (Visible Infrared Imaging Radiometer Suite) sensor and Sentinel-2’s thermal imagery.
Source: Servicio Geológico Minero Argentino volcano activity update 21 October 2024
