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Alert level raised at Galeras 13 March 2009

Posted by admin in activity reports, Colombia, Galeras.
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In a special bulletin released yesterday, 12 March 2009, at 19:30 local time, the INGEOMINAS Pasto observatory announced that the alert level for Galeras was being raised to Orange (II), ‘eruption probable within days or weeks’.

The bulletin observes that ‘a notable reduction in seismicity (related to fluid dynamics’ was registered over the previous 12 hours, and particularly the previous 3 hours, along with ‘the occurrence of ‘low-energy earthquakes associated with small fractures of rigid material occurring at superficial levels’. There has also been a significant decline in the emission of sulphur dioxide. ‘The changes shown in the seismic activity and the degassing processes during the last few hours’, concludes the bulletin, ‘may reflect a pronounced phase of cooling, crystallization and solidification of the material of the dome and of remaining magma’. The volcanologists at Pasto are clearly concerned about the increased danger of an explosive eruption caused by pressure building up beneath a freshly formed plug of cooled and solidified rock.

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

El volcán Galeras otra vez aumenta su actividad – Caracol Radio, 12 March 2009
Alerta en el Galeras subió a naranjaLa Patria, 13 March 2009
Ingeominas cambia de nivel actividad del Volcán GalerasEl Espectador, 13 March 2009

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