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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
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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
Latest satellite images
 

Volcano news: Poás volcano, Costa Rica

Poas volcano (Costa Rica): incandescence of the lava dome

Saturday Sep 24, 2011 09:14 AM | BY: TOM PFEIFFER

Recently, a part of the lava dome inside the crater of Poas volcano has been showing areas of incandescence and flames of burning gas.
The affected area is about 80 m long, located in the northern part of the 1953-55 lava dome next to the crater lake and focused around 2 fissures, which have been growing recently. The area is the same as the origin of the phreatic explosions during the past 2 years. A similar period of incandescence of the dome occurred in 1981.
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Links / Sources:
  • OVSICORI (Informe técnico, 08 de setiembre de 2011)
Previous news
Wednesday, Feb 10, 2010
Our correspondant from Costa Rica reports two phreatic eruptions from Poás volcano's crater lake on the morning of Feb 9. [more]
Friday, Jan 22, 2010
Our correspondant in Costa Rica reports a beautiful phreatic eruption at Poas volcano today at noon time. This is the second eruption (after the one on 25 Dec 09) in a short time span. [more]
Thursday, Sep 13, 2007
Laguna Caliente, the frequently visited summit lake of Poás volcano, exhibits signs that increased fumarolic activity is happening at the bottom of the lake: now greenish-gray in color, convection cells in the lake's center and dark gray floating particles are being noted.
... [more]
Thursday, Apr 13, 2006

On 1 April, scientists visited Poás volcano and confirmed that Laguna Caliente at the volcano's summit had widened, and that sediments and blocks fromthe lake's bottom and surrounding walls were ejected during the explosions on 24-26 March 2006. The lava dome's (or pyroclastic cone's) N wall was greatly fractured and a 40 x 7 x8 m segment of the wall was gone. In addition, a 40 x 4 x 6 m chunk of the SE wall of the lake was missing and must have been destroyed during the explosions. They also found that the lake was light gray due to large quantities of suspended sediments, had a temperature of 54 degrees Celsius, had a pH of 0.63, and the lake level had decreased in comparison to the level before the explosions.

[more]
Friday, Apr 07, 2006

Seismicity decreased at Poás volcano by 27 March, 2006. Harmonic tremor that was recorded during the recent heightened activity ceased. As of the 27th, no significant deformation was recorded at the volcano and abundant evaporation continued at Caliente Lake.

[more]

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