Abstract
On February 27, 2007, the Stromboli volcano, which has usually been characterized by moderate explosive activity, started an effusive eruption with a small lava flow down the NW flank. The permanent broadband network installed on the island allowed the revealing of anomalies in the seismicity before the effusive eruption and for the phenomena to be followed over time, thus obtaining meaningful information about the eruption dynamics. During the effusive phase, a major explosion occurred on March 15, 2007. On that occasion, two strainmeters deployed on the volcano in the previous year recorded a strain increment before the blast. After this explosion, which further destabilized the upper part of the edifice, swarms of Long-Period (LP) and hybrid events were recorded. The characteristics and locations of these events suggest that they were associated with the fracturing processes that affected the summit area of the cone. During the effusive phase, changes in the Very Long Period (VLP) event location were recorded. This type of events accompanied the change in the eruptive style, providing information about the magmatic conduit involved in their seismogenetic processes. The effusive phase stopped on April 2, 2007, and the typical Strombolian activity restarted some months later.
Highlights
When using seismology for monitoring a volcanic system characterized by a permanent eruptive state, the objective is to detect small but significant changes in the seismic activity
In December 2002, the typical explosive activity was interrupted by an effusive phase, with lava flowing from fractures that opened on the NW flank of the volcano at about 600 m a.s.l
The broadband seismic network installed on Stromboli and the cluster computing-based system that performs the data analysis in real time, allowed the early recognition of changes in the seismicity, due to the incoming variations in the eruptive style on February 27, 2007
Summary
When using seismology for monitoring a volcanic system characterized by a permanent eruptive state, the objective is to detect small but significant changes in the seismic activity. A cluster computing-based system was developed for automatically analyzing the data from the broadband network This is integrated with web applications that allow remote access to the analysis results (http://eolo.ov.ingv.it). The signal recorded by the broadband seismic network allowed insight to be obtained into the explosion dynamics and indicated that a deformation of the volcanic edifice occurred before the explosion (D’Auria et al, 2006a) This episode encouraged the idea of installing strainmeters (Agustsson et al, 2000) to measure the elastic deformation detected by the broadband seismometers before the explosion, so using more appropriate instruments, in case of another explosion of the same size. On March 15, 2007, a new violent vulcanian explosion occurred, with features similar to the one of April 5, 2003 On this occasion, the strainmeters recorded an interesting signal some minutes before the explosion. They are related to the same source mechanism (gas slug bursting) that during the effusive phase does not produce summit Strombolian explosions
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