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Chaitén: SERNAGEOMIN update (23 April 2009) 28 April 2009

Posted by admin in activity reports, Chaitén, Chile, eruptions.
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There is a brief update on activity at Chaitén on the SERNAGEOMIN website. The bulletin was issued on 23 April and covers the period 19-21 April 2009. Translation as follows.

23.04.2009 SERNAGEOMIN report on Chaitén volcano

Between 15 and 21 April Chaitén volcano has remained obscured and only on a couple of days (18 and 19 April) was it possible to observe the dome complex and its gas and ash column. The eruption continues unchanging, with the permanent presence of a column of gas and ash, with an altitude not exceeding 1.5 km above the domes.

Depending on the meteorological conditions (humidity, temperature and winds) the column and plume has shown more condensation of water vapour (April 18) or only gas and ash, as on 19 April.

Although the seismic activity reported to date has shown a slight decline in the number of HB-type [hybrid] earthquakes, it has remained relatively constant, with earthquakes that have reached magnitude 4.5. Consistent with the reported seismicity, the seismic energy released RSAM has also maintained its elevated values, a phenomenon that is related to the rate of lava emission, which is increasing the growth of the domes.

Figure 1

This situation favours potential collapses of the domes, possible explosions and the generation of block-and-ash flows, which may affect the valleys adjacent to Chaitén volcano. Moreover, there is still the danger of lahars being generated. In consequence, given that the eruptive process continues to develop, SERNAGEOMIN mantains Volcanic Red Alert.

[End of SERNAGEOMIN bulletin.]

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

Information
Global Volcanism Program: Chaitén – summary information for Chaitén (1508-41)
SERNAGEOMIN – Servicio Nacional de Geología y Minería (Spanish)
Erupción del Volcán Chaitén – extensive coverage of the Chaitén eruption

The Volcanism Blog