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Random pictures
Latest news from Poas volcano:
Monday, May 08, 2017
OVSICORI-UNA an eruption at 17:24 local time on 6 May. Bad weather prevented direct observation of the explosion. ... [more]
Satellite image of Poas volcano on  7 May 2017
Sunday, May 07, 2017
Volcanic Ash Advisory Center Washington (VAAC) issued the following report: ... [more]
 

Poas volcano

Stratovolcano 2708 m (8,884 ft)
Costa Rica, 10.2°N / -84.23°W
Current status: erupting (4 out of 5)
Poas webcams / live data
Poas volcano books | Tours
Last update: 8 May 2017
Typical eruption style: Phreatic eruptions, sometimes geyser-like ejections of water from the acid crater lake.
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
TimeMag. / DepthDistanceLocation
Sun, 7 May
Sun, 7 May 05:25 UTCM 3.6 / 82 km5 km6 km al Oeste de Varablanca, Heredia.
Sat, 6 May
Sat, 6 May 01:43 UTCM 3.2 / 106 km9 km14 km al Este de Varablanca, Heredia.
Fri, 5 May
Fri, 5 May 23:01 UTCM 3.6 / 1 km1 km8 km al Este de Toro Amarillo, Valv. Vega.
Fri, 5 May 07:26 UTCM 3.3 / 4 km2 km8 km al Noroeste de Varablanca, Heredia.
Wed, 3 May
Wed, 3 May 09:18 UTCM 2.6 / 63 km27 km2 km al Oeste de Guacima, Alajuela.
View all recent quakes
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.

Background:

The broad, well-vegetated edifice of Poás has three craters in a N-S line. The 2708-m-high basaltic-to-dacitic complex stratovolcano is cut by a N-S-trending fissure that extends to the lower northern flank, where a parasite volcano (the Congo stratovolcano) and several explosion craters, or maars, most of them lake-filled, have been created.
Poás has two summit crater lakes. The southermost one, Botos, is cold, clear has not eruptied for about 7500 years. The other crater lake is geothermally heated and -after Kawah Ijen in Indonesia - is probably the world's second most acidic natural lake. Its pH is near zero.
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Source: GVP, Smithsonian Institution

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