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Poás is one of Costa Rica´s most active volcanoes, and one of its most frequently visited and prominent ones. It contains a green acid crater lake and during some of its frequent phreatic eruptions, water from the lake is ejected like a geyser.
Stratovolcano 2708 m (8,884 ft)
Costa Rica, 10.2°N / -84.23°W Current status: minor activity or eruption warning (3 out of 5) Poas webcams / live data Poas volcano books | Tours Poas volcano eruptions: 1828, 1834, 1838(?), 1860, 1879(?), 1880, 1888-91, 1895, 1898-1907, 1910, 1910, 1914, 1914-15, 1925, 1929, 1941-46, 1948-51, 1952-57, 1958-61, 1963, 1964-65, 1967, 1969, 1970, 1972-73, 1974-75, 1976, 1977, 1977-78, 1978, 1979-80, 1980, 1981, 1987-90, 1991, 1992, 1992-93, 1994, 1996, 2010, 2011, 2012, 2013, 2014, 2016, 2017 Typical eruption style: Phreatic eruptions, sometimes geyser-like ejections of water from the acid crater lake. Last earthquakes nearby Latest satellite images
Volcano news: Poás volcano, Costa Rica
Poás volcano (Costa Rica): explosion on Friday produces plume of 3 km height
Saturday Apr 15, 2017 17:19 PM | BY: T
Explosion from Poás 14 April morning (image: Carlos Arguedas C. / La Nacion)
The "dome" at the lakeshore of Poás crater with recent evidence of deformation (likely by shallow magma intrusion)
The activity of the volcano continues to increase, culminating (so far) in a moderately strong explosion at 7:57 Friday morning (local time) which was the largest recorded at the volcano in the current crisis so far.
The eruption produced an steam and ash plume that rose 3 km above the crater and caused light ash falls occurred in Heredia and Alajuela.
The strong explosion was preceded by several smaller and moderately sized explosions from around 6 am; the most significant one occurred at 6:59, 7:18, 7:39 and 7:57 local time.
No damage or injuries have been reported. The Poas National Park was closed. The National Emergency Commission (CNE) maintains an alert for the municipalities of Poás, Valverde Vega, Alajuela, Zarcero, Greece, San Carlos and Río Cuarto.
Recent field observations and analyses by OVSICORI-UNA found several indications that the current activity is at least in parts now driven by fresh magma near the surface:
Ash from explosions on 12 April contained a small amount of black volcanic glass, likely from the new ("juvenile") magma, measured gas compositions that are increasingly characteristic of those from fresh magma, a significant increase in temperatures, and ground deformation (bulging) in an area near the lake where magma has probably intruded at shallow depth into a (still hidden) dome.
The activity of the volcano has increased recently. On Saturday, several small phreatic (steam-driven) explosions occurred at the crater lake and scientists measured elevated gas emission rates and raised temperatures. ... [more]
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