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Galeras alert level lowered 27 March 2009

Posted by admin in activity reports, Colombia, Galeras.
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Galeras 23 March 2009 (copyright INGEOMINAS)

The INGEOMINAS volcanological observatory at Pasto lowered the alert level for Galeras to Yellow (III) on 24 March 2009. Seismicity has been low in levels of energy and in terms of the numbers of earthquakes. Earthquakes have been occurring at varying levels within the volcanic system, suggesting both pressure release and the recharging of magma at depth. Sulphur dioxide flux has been measured at between 1000 and 1900 tonnes per day during the last week, considerably higher than the ‘low to moderate’ levels recorded during the preceding week. White plumes have been observed reaching no higher than 1100 metres above the summit.

The volume of material deposited during the eruptions of Galeras during February and March this year is estimated as nearly 2.5 million cubic metres, which corresponds to half the total estimated volume of the lava dome.

The conditions exist for the accumulation of pressure within the volcanic system to resume, leading to further explosive activity. INGEOMINAS thus anticipates further fluctuations in activity levels at Galeras.

[Image: White plume from Galeras on 23 March 2009 at 07:39 local time. Original image from Pasto Volcanological and Seismological Observatory (copyright INGEOMINAS, reproduced here for non-commercial purposes in accordance with the terms of use).]

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