Report on Sabancaya (Peru) — 23 October-29 October 2019
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
23 October-29 October 2019
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2019. Report on Sabancaya (Peru). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 23 October-29 October 2019. Smithsonian Institution and US Geological Survey.
15.787°S, 71.857°W; summit elev. 5960 m
All times are local (unless otherwise noted)
Instituto Geofísico del Perú (IGP) reported that an average of 48 low-to-medium intensity explosions per day occurred at Sabancaya during 21-27 October. Gas-and-ash plumes rose as high as 2.5 km above the summit and drifted W, SW, and S. There were 15 thermal anomalies identified in satellite data. The report noted that the lava dome in the summit crater had been slowing extruding since February and filling in the N part of the crater, though the rate of the extrusion had increased in recent months. On 26 October Observatorio Vulcanológico del INGEMMET (OVI) conducted a drone overflight and captured video of the lava dome. The estimated volume of the lava dome was 4.6 million cubic meters based on the footage. The Alert Level remained at Orange (the second highest level on a four-color scale) and the public were warned to stay outside of a 12-km radius.
Geological Summary. Sabancaya, located in the saddle NE of Ampato and SE of Hualca Hualca volcanoes, is the youngest of these volcanic centers and the only one to have erupted in historical time. The oldest of the three, Nevado Hualca Hualca, is of probable late-Pliocene to early Pleistocene age. The name Sabancaya (meaning "tongue of fire" in the Quechua language) first appeared in records in 1595 CE, suggesting activity prior to that date. Holocene activity has consisted of Plinian eruptions followed by emission of voluminous andesitic and dacitic lava flows, which form an extensive apron around the volcano on all sides but the south. Records of historical eruptions date back to 1750.