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Galeras: alert level lowered 20 May 2009

Posted by admin in activity reports, Colombia, Galeras.
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The INGEOMINAS Observatorio Vulcanológico y Sismológico de Pasto, which monitors Galeras volcano in southern Colombia, yesterday lowered the alert status for the volcano from the second-highest level of Orange (applied on 11 May 2009) to Yellow (Amarillo), ‘changes in the behaviour of volcanic activity’.

The bulletin announcing the change reports an increase in the emission of volcanic gases, sometimes accompanied by ash, and a reduction in ‘rock fracturing’ earthquakes, leading INGEOMINAS to conclude that the pressure that had been building up within the volcano is now being released without explosive eruption. An overflight on 17 May noted gas emissions from within, and at the edges of, the principal crater, and detected thermal anomalies at the peripheries of the crater.

For all our Galeras coverage: Galeras « The Volcanism Blog.

Information
Smithsonian Institution Global Volcanism Program – summary information for Galeras (1501-08=)
Portal Corporativo de INGEOMINAS – Instituto Colombiano de Geología y Minería
Observatorio Vulcanológico y Sismológico de Pasto – Pasto volcanological observatory main page

The Volcanism Blog