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Abstract
During the second half of June, 2008, 50 broadband seismic stations were deployed
on Mt Etna volcano in close proximity to the summit, allowing us to observe seismic
activity with exceptionally high resolution. 129 long period events (LP) with dominant
frequencies ranging between 0.3 and 1.2 Hz, were extracted from this dataset. These
events form two families of similar waveforms with different temporal distributions.
Event locations are performed by cross-correlating signals for all pairs of stations
in a two-step scheme. In the first step, the absolute location of the centre of the
clusters was found. In the second step, all events are located using this position.
The hypocentres are found at shallow depths (20 to 700 m deep) below the summit craters.
The very high location resolution allows us to detect the temporal migration of the
events along a dike-like structure and 2 pipe shaped bodies, yielding an unprecedented
view of some elements of the shallow plumbing system at Mount Etna. These events do
not seem to be a direct indicator of the ongoing lava flow or magma upwelling.