Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya continued to decline; there was an average of 29 explosions recorded per day during 11-17 September.
The earthquakes were dominated by long-period events and signals indicating emissions, with fewer numbers of hybrid events.
Gas-and-ash plumes rose 2.5 km above the crater rim and drifted no more than 30 km E and SE.
The MIROVA system detected one thermal anomaly.
The report warned the public not to approach the crater within a 12-km radius.
Sources: Instituto Geofísico del Perú (IGP),Instituto Geológico Minero y Metalúrgico (INGEMMET)