Several parasitic pyroclastic cones affect Mt. Etna flanks. The present study aims to provide, through a ambient vibrations survey, useful information on subsurface structure of Mt. Vetore pyroclastic cone, located in the upper S rift zone. Ambient noise recordings were performed in the Mt. Vetore cone area, using a short period velocimeter and processing data through the HVNR technique. The time-frequency (TF) polarization analysis was also applied. Results show that the maxima of the horizontal ground motion polarization take place almost perpendicularly to the main buried magma-feeding fractures, which are trending North-North-West, and point the existence, in the investigated area, of at least 50 m thick pyroclastic deposits overlaying the lava rock cooled within the eruptive fracture NNW oriented.
Insights into the subsurface structure of Mt. Vetore pyroclastic cone (Etna) using ambient vibIrations technique
F. Panzera
;S. GrestaMembro del Collaboration Group
;S. ImposaMembro del Collaboration Group
;G. LombardoMembro del Collaboration Group
2017-01-01
Abstract
Several parasitic pyroclastic cones affect Mt. Etna flanks. The present study aims to provide, through a ambient vibrations survey, useful information on subsurface structure of Mt. Vetore pyroclastic cone, located in the upper S rift zone. Ambient noise recordings were performed in the Mt. Vetore cone area, using a short period velocimeter and processing data through the HVNR technique. The time-frequency (TF) polarization analysis was also applied. Results show that the maxima of the horizontal ground motion polarization take place almost perpendicularly to the main buried magma-feeding fractures, which are trending North-North-West, and point the existence, in the investigated area, of at least 50 m thick pyroclastic deposits overlaying the lava rock cooled within the eruptive fracture NNW oriented.File | Dimensione | Formato | |
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