Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya was comparable to the previous week; explosions averaged 30 per day during 14-20 May.
Seismicity was dominated by long-period events and signals indicating emissions.
Gas-and-ash plumes rose as high as 1.9 km above the crater rim and drifted N and NW.
The MIROVA system detected nine thermal anomalies, and on 19 May the sulfur dioxide gas flux was high at 3,147 tons/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)