Report on Sabancaya (Peru) — 6 August-12 August 2014
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 6 August-12 August 2014
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2014. Report on Sabancaya (Peru). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 6 August-12 August 2014. Smithsonian Institution and US Geological Survey.
15.787°S, 71.857°W; summit elev. 5960 m
All times are local (unless otherwise noted)
IGP reported that on 6 August there was increasing seismic and fumarolic activity at Sabancaya over the past four days. Fumarolic emissions increased, were white to blueish white and gray and rose to 3 km above the crater. On 9 August IGP reported an explosion that lasted 50 seconds at Sabancaya accompanied by increasing seismic activity including a strong increase in hybrid earthquakes. Intermittent views in cloudy conditions showed strong fumarolic emissions continued.
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.