Report on Guallatiri (Chile) — 15 July-21 July 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 15 July-21 July 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on Guallatiri (Chile). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 15 July-21 July 2015. Smithsonian Institution and US Geological Survey.
18.42°S, 69.092°W; summit elev. 6071 m
All times are local (unless otherwise noted)
On 7 July OVDAS-SERNAGEOMIN reported that the Alert Level for Guallatiri was lowered to Green (the lowest level on a four-color scale) because activity had returned to the baseline levels observed prior to the Alert-Level increase in May. Baseline levels were characterized by low levels of seismicity, no deformation, and white emissions.
Geologic Background. One of northern Chile's most active volcanoes, Volcán Guallatiri is a symmetrical ice-clad stratovolcano at the SW end of the Nevados de Quimsachata volcano group. It lies just W of the border with Bolivia and is capped by a central dacitic dome or lava complex, with the active vent situated on its S side. Thick lava flows are prominent on the lower N and W flanks of the andesitic-to-rhyolitic volcano. Minor explosive eruptions have been reported since the beginning of the 19th century. Intense fumarolic activity with "jet-like" noises continues, and numerous solfataras extend more than 300 m down the W flank.