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Sunday, Sep 09, 2012
Minor rockfalls were reported from Irazú´s main crater walls following the magnitude 7.6 earthquake on 5 Sep. [more]
 

Irazu volcano

Stratovolcano 3432 m / 11,260 ft
Costa Rica, 9.98°N / -83.85°W
Current status: dormant (1 out of 5)
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Last update: 4 Jun 2016
Typical eruption style: Explosive.
Irazu volcano eruptions: 1726, 1775(?), 1821(?), 1822, 1823, 1826(?), 1842, 1844(?), 1847, 1864, 1875, 1882(?), 1909(?), 1914(?), 1917-21, 1924, 1928, 1930, 1933, 1939-40, 1963-65, 1977, 1994
TimeMag. / DepthDistanceLocation
Tue, 22 May
Tue, 22 May 00:30 UTCM 3.0 / 7 km20 km3 km al Sur de Tejar, El Guarco.
Mon, 21 May
Mon, 21 May 20:26 UTCM 3.1 / 5 km39 km COSTA RICA
Mon, 21 May 14:32 UTCM 2.3 / 21 km56 km16 km al Oeste de San Isidro, Leon Cortes.
Mon, 21 May 10:44 UTCM 4.2 / 98 km16 km16 km al Sur de Horquetas, Sarapiqui.
Mon, 21 May 09:42 UTCM 3.0 / 3 km0 km8 km al Norte de Santa Cruz, Turrialba.
View all recent quakes
Irazú (3432 m) immediately east of the capital San José is Costa Rica's highest and one of its most active volcanoes. Tephra fall (ash) during the last major eruption of Irazú in 1963-65 caused heavy damage to infrastructure and life in San José and its surroundings.

Background:

Irazú is a massive stratovolcano covering more than 500 sq km with at least 10 flank cones on the southern flank, all being older than at least 14,000 years when a massive lava flow (the "Ceravantes" flow) was erupted.
All known eruptions from Irazú during the past 10,000 years have been explosive and originated from the summit craters that show a migration to the W over time. The historically active crater contains a small acid lake of changing size and color.
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Source: GVP, Smithsonian Institution

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