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Galeras update, 25 February 2009 25 February 2009

Posted by admin in activity reports, Colombia, Galeras.
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The alert level at Galeras remains at Orange (II), ‘eruption probable within days or weeks’. The INGEOMINAS observatory at Pasto issued a new bulletin yesterday evening which reports continuing low levels of seismicity and a white, ash-free plume reaching 500m above the crater and dispersing to the north-north-west. The volcano’s SO2 output has been fluctuating, with an average of under 430 tonnes/day. This appears to be within the normal range for Galeras during an active phase: during a similar period of activity from December 2005 to January 2006 the sulphur dioxide flux varied from 300 to 1500 tonnes/day.

The view of the experts at Pasto is that ‘while the recent explosive eruptions at Galeras (14 and especially 20 February) have allowed the release of pressure that had accumulated within the volcanic sytem, the general behaviour of the volcano continues to present conditions that reflect possible processes of blockage-release’.

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

Information
Global Volcanism Program – Galeras – 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