Llaima update (bulletin of 5 May 2009) 10 May 2009Posted by admin in activity reports, Chile, Llaima.
Tags: Chile, Llaima, South America, volcanic activity reports
The Chilean state geological service SERNAGEOMIN have issued a bulletin reporting activity at Llaima volcano from 28 April to 4 May 2009. A shortened version has been published on the SERNAGEOMIN website (in company with a bulletin on Chaitén), and the full document (PDF) is available from OVDAS.
The bulletin reports the continuing sporadic presence of incandescent points in the south-western margin of the principal crater ‘corresponding with outcrops of lava from which, occasionally, blocks fall and roll down the slopes of the western flank of the volcano’. Weak steam emissions have been seen in the mornings from Llaima’s summit, produced by the condensation of cold air in contact with the heated areas of the volcano. There have been no significant changes in the seismic behaviour of the volcano, which is characterized by weak tremor and LP-type (long period) earthquakes of up to 70 seconds’ duration, ‘related to the continuing movement of fluids and gases in the interior of the volcano’. The number of LP earthquakes ranges between 15 and 18 per hour, which represents no significant change from previous weeks. Seismic energy released (RSAM) has shown a slight tendency to increase.
The bulletin concludes that ‘the situation of the volcano is still critical because of its erratic seismic behaviour, the obstruction of its crater, the sporadic emission of lava in the western margin of the principal crater and the occasional emissions of gas and particulate material from the summit and various points on the western flank.’ There could be renewed explosive activity and lava flows, and thus SERNAGEOMIN maintains Yellow Alert.
For all our Llaima coverage: Llaima « The Volcanism Blog.
Global Volcanism Program: Llaima – summary information for Llaima (1507-11=)
Oficina Nacional de Emergencia – Chilean government emergencies office
SERNAGEOMIN – Servicio Nacional de Geología y Minería, Chile
Proyecto Observación Visual Volcán Llaima – Llaima Visual Observation Project