Chaitén: SERNAGEOMIN bulletin, 27 June 2008 28 June 2008
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SERNAGEOMIN have published a new bulletin on activity at Chaitén volcano, dated 27 June 2008. Translation as follows:
27.06.2008 SERNAGEOMIN bulletin regarding Chaitén volcano
It was not possible to take observations of the Chaitén volcano on 26 June because of the bad weather prevalent in the area.
Seismic data supplied by the PUMA and STBA stations showed stability in the number of type VT [volcano tectonic] earthquakes, which in the past days amounted to about 50 earthquakes per day, averaging about 2 per hour, in general, with magnitudes of less than 2. However, on 25 June four earthquakes were recorded that exceeded a magnitude of 2.
According to the data, seismicity continues to be concentrated under the volcano. No earthquakes of type LP [long period] or type HB [hybrid] have been detected. This, with the presence of open emission centres and continuous degassing, indicates that there has been no repressurization of the system, as described in previous bulletins.
Despite the foregoing, it is important to consider that, during periods of heavy rains, it is probable that there will be a continuation of the occurrence of lahars in the main channels near the volcano. Additionally, accumulations of rocks and ashes in the bottom of caldera-type depression, associated with the growth of the new dome, could produce blockages, the collapse of which could cause new floods of the Chaiten river.
On the other hand, there remains the probable collapse of the old dome and the subsequent generation of pyroclastic flows associated with this process.
There have been no Volcanic Ash Advisories from Buenos Aires VAAC since 1820UTC on 25 June, when ‘continuous emission’ was reported but at too low an altitude to bother aviators. Aviation Color Code was ‘unknown’.
For all our Chaitén coverage: Chaitén << The Volcanism Blog
Information
Global Volcanism Program: Chait̩n Рsummary information for Chait̩n (1508-41)
ONEMI, Oficina Nacional de Emergencia – Chilean government emergencies office (Spanish)
SERNAGEOMIN – Servicio Nacional de GeologÃa y MinerÃa (Spanish)
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Did you receive the new info overnight? Major increase in VT seismicity. 115 small quakes per day, 25-30 greater than mag 2, epicenters W and SW caldera. No harmonic tremor, however. Sernageomin is puzzled.
I wonder whether ground water is interacting with the hot conduit. If so, there might be a steam explosion. This would be seen as another eruption, but it would essentially be an aftermath event, unless more magma ascends.
[...] Chaitén update, 30 June 2008 30 June 2008 Posted by volcanism in Chaitén, Chile, activity reports, eruptions. Tags: Chaitén, Chile, South America, volcanic activity reports, volcanic eruptions trackback The latest Chaitén updates have arrived in my inbox since yesterday, but I haven’t had a chance to check them until now. This information has not yet been published on the SERNAGEOMIN website. Alan Sullivan has already published his thoughts on the latest information, and commented here on an earlier post. [...]
Very nice!!