Puyehue-Cordón Caulle update, 12 June 2011 12 June 2011Posted by admin in activity reports, Chile, eruptions, Puyehue.
The Chilean Servicio Nacional de Geología y Minería (SERNAGEOMIN) has issued its latest bulletin on the activity at Puyehue-Cordón Caulle: Reporte Especial de Actividad Volcánica No 36, 11 June 2011 (the PDF has not been posted yet). Overall the eruption shows no sign of coming to an end: the key word in this bulletin, as the preceding ones, is ‘stability’, although SERNAGEOMIN emphasizes that the behaviour of the volcano may change and the intensity of the eruption increase at any time. There is continuing ashfall and a high risk of lahars.
- Seismic activity at Cordón Caulle ‘showed no major changes compared with yesterday’, with an average of 5 events per hour, with magnitudes not exceeding 2.3. The earthquakes have been located to the area SE of Cordón Caulle, the majority at depths of between 3 and 5 km.
- The ‘continuous signal of tremor’ observed since the beginning of the eruption is continuing in a stable manner, associated with degasification and the movement of material towards the surface.
- The eruption plume ‘has shown an oscillating pattern with respect to its altitude’, reaching a height of approximately 4.0-4.5 km in the morning of 11 June and trending towards the east. The plume has shown a ‘slightly whiter’ colouring than on previous days.
- The Nilahue river has shown decreased flow in comparison to 10 June, and is still brown in colour, carrying quantities of pyroclastic material.
- The bulletin highlights the threat of lahars, created by the heavy rains in the area and the large quantities of deposited pyroclastic materials
The alert level for Puyehue-Cordón Caulle remains Red 6, ‘moderate eruption’.
Global Volcanism Program: Puyehue-Cordón Caulle volcanic complex – summary information for the PCCVC (1507-15=)