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Random pictures
Latest news from Poas volcano:
Thursday, Jul 28, 2016
A small phreatic eruption occurred from the hot crater lake in the morning (08:19 local time) on 25 July and ejected material to 50 m above the crater lake's surface. [more]
Phreatic explosion at Poás last week (OVSICORI-UNA)
Sunday, Jul 10, 2016
The volcano remains highly restless, the hydrothermal system probably being disturbed by a shallow magma body. ... [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: 28 Jul 2016
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
TimeMag. / DepthDistanceLocation
Mon, 27 Mar
Mon, 27 Mar 10:21 UTCM 2.5 / 99 km23 km13 km al Oeste de Guapiles, Pococi.
Mon, 27 Mar 04:09 UTCM 2.2 / 102 km15 km10 km al Suroeste de Ciudad Quesada.
Sun, 26 Mar
Sun, 26 Mar 17:12 UTCM 2.5 / 15 km29 km4 km al Suroeste de San Antonio, Escazu.
Fri, 24 Mar
Fri, 24 Mar 09:27 UTCM 3.0 / 8 km28 km2 km al Oeste de Ciudad Colon, Mora.
Fri, 24 Mar 00:34 UTCM 2.4 / 8 km25 km1 km al Oeste de Santa Ana, San Jose.
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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