1 km al Noroeste de COLONIA VIRGEN DEL SOCORRO de Alajuela de Alajuela
Sat, 18 May
Sat, 18 May 05:01 UTC
M 2.6 / 101 km
1 km al Sureste de SAN RAFAELILLO de San Carlos de Alajuela
Sun, 28 Apr
Sun, 28 Apr 23:13 UTC
M 2.9 / 127 km
En las cercanias de SABANILLA de Montes de Oca de San Jos
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.
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
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