Report on Sabancaya (Peru) — 29 March-4 April 2017
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 29 March-4 April 2017
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2017. Report on Sabancaya (Peru). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 29 March-4 April 2017. Smithsonian Institution and US Geological Survey.
15.787°S, 71.857°W; summit elev. 5960 m
All times are local (unless otherwise noted)
Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that during 27 March-2 April there were an average of 41 explosions recorded per day. The number and magnitude of hybrid events decreased while long-period events increased. Ash plumes rose as high as 4.8 km above the crater rim and drifted more than 40 km NW, N, and SW. Ashfall was reported in Pinchollo (20 km N) and Cabanaconde (22 km NW). Overall activity increased compared to the precious week. The Alert Level remained at Orange (the second highest level on a four-color scale).
Geologic Background. 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.