Report on Ubinas (Peru) — 25 June-1 July 2008
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 25 June-1 July 2008
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2008. Report on Ubinas (Peru) (Sennert, S, ed.). Weekly Volcanic Activity Report, 25 June-1 July 2008. Smithsonian Institution and US Geological Survey.
Ubinas
Peru
16.345°S, 70.8972°W; summit elev. 5608 m
All times are local (unless otherwise noted)
According to a news articles on 30 June, the Alert level for Ubinas continued at Yellow because small explosions and ash-and-gas emissions continued during the previous two months. Inhabitants of local communities and their livestock have suffered the effects of gas and ash emissions. Local authorities have begun discussion of the potential relocation of about 650 affected families.
Based on SIGMET reports, the Buenos Aires VAAC reported that an ash plume rose to altitudes of 5.5-6.1 km (18,000-120,000 ft) a.s.l. on 26 June. The plume drifted NE and was not observed on satellite imagery.
Geological Summary. The truncated appearance of Ubinas, Perú's most active volcano, is a result of a 1.4-km-wide crater at the summit. It is the northernmost of three young volcanoes located along a regional structural lineament about 50 km behind the main volcanic front. The growth and destruction of Ubinas I was followed by construction of Ubinas II beginning in the mid-Pleistocene. The upper slopes of the andesitic-to-rhyolitic Ubinas II stratovolcano are composed primarily of andesitic and trachyandesitic lava flows and steepen to nearly 45°. The steep-walled, 150-m-deep summit crater contains an ash cone with a 500-m-wide funnel-shaped vent that is 200 m deep. Debris-avalanche deposits from the collapse of the SE flank about 3,700 years ago extend 10 km from the volcano. Widespread Plinian pumice-fall deposits include one from about 1,000 years ago. Holocene lava flows are visible on the flanks, but activity documented since the 16th century has consisted of intermittent minor-to-moderate explosive eruptions.
Sources: La República, Buenos Aires Volcanic Ash Advisory Center (VAAC), Perú 21