Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that an average of 21 explosions per day occurred at Sabancaya during 26 November-2 December.
Long-period seismic events were recorded, and hybrid earthquakes were infrequent and of low magnitude.
Gas-and-ash plumes rose as high as 2.5 km above the crater rim and drifted 30 km N, E, and SE.
MIROVA detected eight thermal anomalies, and on 28 November the sulfur-dioxide gas flux was high at 4,600 tons per day.
The report noted that the public should not approach the crater within a 12-km radius.
Sources: Instituto Geofísico del Perú (IGP),Instituto Geológico Minero y Metalúrgico (INGEMMET)