Report on Villarrica (Chile) — 3 June-9 June 2015
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 3 June-9 June 2015
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2015. Report on Villarrica (Chile) (Sennert, S, ed.). Weekly Volcanic Activity Report, 3 June-9 June 2015. Smithsonian Institution and US Geological Survey.
39.42°S, 71.93°W; summit elev. 2847 m
All times are local (unless otherwise noted)
On 8 June, OVDAS-SERNAGEOMIN reported that activity at Villarrica continued the gradual decline observed in recent weeks. The Alert Level was lowered to Yellow (the second lowest level on a four-color scale) and the public was warned to stay outside of a 3-km radius around the crater and away from drainages.
Geological Summary. The glacier-covered Villarrica stratovolcano, in the northern Lakes District of central Chile, is ~15 km south of the city of Pucon. A 2-km-wide caldera that formed about 3,500 years ago is located at the base of the presently active, dominantly basaltic to basaltic-andesite cone at the NW margin of a 6-km-wide Pleistocene caldera. More than 30 scoria cones and fissure vents are present on the flanks. Plinian eruptions and pyroclastic flows that have extended up to 20 km from the volcano were produced during the Holocene. Lava flows up to 18 km long have issued from summit and flank vents. Eruptions documented since 1558 CE have consisted largely of mild-to-moderate explosive activity with occasional lava effusion. Glaciers cover 40 km2 of the volcano, and lahars have damaged towns on its flanks.