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Poas volcano
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)
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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
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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)
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 "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.
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Links / Sources:
Previous news
Saturday, Apr 15, 2017
Volcanic Ash Advisory Center Washington (VAAC) issued the following report: ... [more]
Friday, Apr 14, 2017
Volcanic Ash Advisory Center Washington (VAAC) issued the following report: ... [more]

Thursday, Apr 13, 2017
Volcanic Ash Advisory Center Washington (VAAC) issued the following report: ... [more]
Thursday, Apr 13, 2017
Volcanic Ash Advisory Center Washington (VAAC) issued the following report: ... [more]
Recent activity of Poás volcano (image: OVSICORI-UNA)
Monday, Apr 10, 2017
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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