The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
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.
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 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
Image of Poás crater on 12 July 2017 with several vents and no more crater lake (image: RSN)
As a result of the recent eruptions, the crater lake has disappeared. At the place of the old lava dome near the center of the crater, a small pyroclastic cone has formed around the main emission point. ...more
Strong sulfur gas (SO2) emission is also occurring from other vents at the crater floor, indicating the presence of magma at shallow depth. During the month of June and this first half of July, the activity consisted of intermittent, passive ash eruptions of varying duration, with sometimes smaller quantities of solid materials including incandescent rock fragments ejected. [less]
Small phreatic eruptions continue to occur from the volcano's crater lake. Ash emissions less than 1 km high and mostly drifting N were seen frequently during breaks in weather by observers near the crater: on 16 June, at 18 June at 13:40 on 18 June, and at 11:00 and 13:50 on 20 June. ...more
Most of the time, a steam plume rising less than 1 km is seen from the crater lake. [less]
Tremor levels were at low-to-moderate levels during 17-21 May and at higher levels during 22-23 May. ...more
Low-amplitude long-period earthquakes were recorded on 19 May, and some low-frequency and volcano-tectonic events were detected during 21-22 May. Plumes consisted mainly of gas and water vapor, but sometimes included solid material, and rose no more than 1 km above the vent. [less]
Dukono volcano photos: Dukono on Halmahera in Indonesia has been in permanent activity for years, often producing ash plumes that drift around the northern part of the island and have become normality.
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