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Latest news from Poas volcano:
Wed, 13 May 2020, 08:43
Incandescence from Poas volcano on 6 May (image: OVSICORI)
On 6 May between 04:00-06:00 local time OVSICORI-UNA reported visible incandescence associated with fumarolic activity located south of the Boca A. Seismicity remains stable including regular intervals of 200 to 300 per day. No eruption was detected. The lake level is stable. read all
Thu, 13 Feb 2020, 03:58
OVSICORI-UNA report that there is currently a stable fluctuation pattern of seismic activity at the volcano. There is continued inflation but not a significant amount. Carbon dioxide/Sulfur dioxide (CO 2 / SO 2) ratios remains stable with the exception of a peak on February 9. There is almost no Hydrogen sulfide (H 2 S). Sulfur dioxide emissions significantly increased over the weekend (February 8-9). The crater lake level has also decreased. ... read all
 

Poas volcano

Stratovolcano 2708 m (8,884 ft)
Costa Rica, 10.2°N / -84.23°W
Current status: restless (2 out of 5)
Poas webcams / live data | Reports
Poas volcano books | Tours
Last update: 13 May 2020 (steaming)
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
Tue, 20 Oct 2020 (UTC)
20 de octubre del 2020 3:38 pm (20 Oct 21:38:00 UTC)M 3.0 / 33 km26 km5 Km Al Norte De Atenas, Alajuela., Costa Rica
Sun, 18 Oct 2020 (UTC)
18 de octubre del 2020 4:56 am (18 Oct 10:56:00 UTC)M 2.8 / 6 km2 km6 Km Al Oeste De Varablanca, Heredia., Costa Rica
Thu, 15 Oct 2020 (UTC)
15 de octubre del 2020 1:53 am (15 Oct 07:53:00 UTC)M 2.7 / 83 km4 km4 Km Al Este De Toro Amarillo, Valv. Vega., Costa Rica
Mon, 21 Sep 2020 (UTC)
2020-09-20 23:24:04 (21 Sep 05:24:04 UTC)M 3.5 / 13 km16 km18 Km Al Norte De Vara Blanca, Costa Rica
Sat, 29 Aug 2020 (UTC)
28 de agosto del 2020 9:59 pm (29 Aug 03:59:00 UTC)M 4.1 / 75 km6 km8 Km Al Noreste De San Roque, Grecia. (Costa Rica)
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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