Poas vulcano

Stratovolcano 2708 m (8,884 ft)
Costa Rica, 10.2°N / -84.23°W
Stato attuale: normal or dormant (1 di 5)
Last update: 16 Mar 2021 (steaming)

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.

Show interactive Map
Stile eruttivo tipico: Phreatic eruptions, sometimes geyser-like ejections of water from the acid crater lake.
Eruzioni del vulcano Poas: 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

Latest nearby earthquakes

Data / oraMag. / ProfonditàDistanza/Ubicazione
Tue, 27 Jul 2021 (GMT) (2 Terremoti)
2021-07-27 08:30:49 (27 Jul 2021 14:30:49 GMT)

66 km
16 km (9.9 mi)
Alajuela, Provincia de Alajuela, 18 km a nord ovest da San José, Costa Rica
27 de julio del 2021 8:30 am (27 Jul 2021 14:30:00 GMT)

79 km
15 km (9.3 mi)
Alajuela, Provincia de Alajuela, 19 km a nord ovest da San José, Costa Rica
Mon, 26 Jul 2021 (GMT) (1 terremoto)
26 de julio del 2021 11:34 am (26 Jul 2021 17:34:00 GMT)

35 km
33 km (21 mi)
Mora, 14 km a ovest da San José, Costa Rica
Sun, 25 Jul 2021 (GMT) (1 terremoto)
2021-07-25 00:41:00 (25 Jul 2021 06:41:00 GMT)

56 km
29 km (18 mi)
Santo Domingo, Provincia de Heredia, 5.1 km a nord da San José, Costa Rica
Thu, 22 Jul 2021 (GMT) (1 terremoto)
22 de julio del 2021 5:36 pm (22 Jul 2021 23:36:00 GMT)

9 km
43 km (27 mi)
Desamparados, 8.7 km a sud-est da San José, Costa Rica


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.
Source: GVP, Smithsonian Institution

Poas Photos

Vulkan Poás in Costa Rica (Photo: Astrid_Furrer)
Vulkan Poás in Costa Rica (Photo: Astrid_Furrer)

See also: Sentinel hub | Landsat 8
Show more

Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version

Piu su VolcanoDiscovery

Why is there advertising on this site?
Support us - Help us upgrade our services!
We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Weather reports
  • Tsunami alerts
  • Design upgrades
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Earthquake archive from 1900 onwards
  • Additional seismic data sources
  • Improved content in English
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Copyrights: VolcanoDiscovery e da altre fonti come indicato.
Uso di materiale: Most texts and images, in particular photographs, on this website are protected by copyright. Further reproduction and use of without authorization is usually not consented. If you are not sure or need licensing rights for photographs, for example for publications and commercial use, please contact us.