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S eismic wave P ropagation and I maging in C omplex media: a E uropean network

Explore long-period seismic activity at Mt. Etna through wavefield analysis and moment-tensor inversion. Gain better understanding of processes within the volcano. Study data suggests fluid-filled buried cavities and cracks as likely sources. Reliable source location enhances moment-tensor inversion. Utilize representative LP events for inversion using Green’s functions and 3D rotational scheme. Perform inversion in the frequency domain after testing.

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S eismic wave P ropagation and I maging in C omplex media: a E uropean network

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  1. Seismic wave Propagation and Imaging in Complex media: a European network • Ivan Lokmer • Early Stage Researcher • Host Institution: UCD Dublin • Place of Origin: Zagreb • Appointment Time: January 2004 • Project: Long-period Seismic Activity at Mt. Etna: Wavefield Analysis and Moment-tensor Inversion • Task Groups: TG Small Scale • Cooperation: University of Hamburg, OV-INGV Naples, INGV Catania

  2. Project ScopeBetter understanding of LP events at Mt. Etna A large number of LP events (~ 50,000) recorded at the Mt. Etna from November 2003-September 2004 enables us to get better insight into processes within the volcano by performing detailed wavefield analysis and a robust moment-tensor inversion. Although events differ in their number and size, their similarity gives us an opportunity to enhance the signal-to-noise ratio by stacking them and so create a high quality database for moment-tensor inversion

  3. Main Results The persistence of the same spectral peak at all the stations and the similarity of waveforms indicate the resonance of the fluid-filled buried cavity as the most likely source process Data seem to suggest that the LP-generating processes are not related to the renewal of effusive activity Significant amount of shear observed during polarisation analysis suggests a crack as the most likely source geometry Reliable source location is a good starting point for the moment-tensor inversion

  4. Outlook Due to the similarity of events, the largest ones can be considered as representative for the entire period of the LP sequence, so they will be used for the moment-tensor inversion The Green’s functions will be computed by the 3D staggered rotational scheme using the Etna topography and velocity model – the code is currently being tested for reciprocityMoment tensor inversion is going to be performed in the frequency domain - the code will previously be tested against the code from the Hamburg group

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