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Latest news from Poas volcano:
Wednesday, Sep 13, 2017
Volcanic Ash Advisory Center Washington (VAAC) issued the following report: ... [more]
Tuesday, Aug 29, 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: minor activity or eruption warning (3 out of 5)
Poas webcams / live data
Poas volcano books | Tours
Last update: 13 Sep 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
Fri, 22 Sep
Fri, 22 Sep 08:57 UTCM 2.4 / 8 km27 km1 km al Suroeste de Piedades de Santa Ana.
Thu, 21 Sep
Thu, 21 Sep 01:06 UTCM 2.9 / 14 km14 km12 km al Norte de Varablanca, Heredia.
Tue, 19 Sep
Tue, 19 Sep 00:25 UTCM 3.1 / 74 km22 km1 km al Este de Patarra, Desamparados.
Sun, 17 Sep
Sun, 17 Sep 23:25 UTCM 2.4 / 9 km19 km3 km al Sur de Tres Rios, La Union.
Sun, 17 Sep 22:31 UTCM 2.4 / 10 km19 km3 km al Sur de Tres Rios, La Union.
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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.

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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