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Approach to the volcanic tremor by covariance analysis: Application to the 1989 eruption of Mt. Etna (Sicily)
Author(s) -
Ferrucci F.,
Godano C.,
Pino N. A.
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i013p02425
Subject(s) - geology , volcano , seismology , polarization (electrochemistry) , covariance , geophysics , statistics , mathematics , chemistry
Polarization of the tremor wavefield, recorded during three periods of the 1989 eruption of Mt. Etna at a temporary array of three‐component stations, is analyzed by use of a polarization filter. The tremor shows steady horizontal, near‐linear, west‐east polarization at all stations. Such a behaviour, which could be coherent with a P‐wavefield radiated by a vertical extended source with overall north‐south alignment, excludes confinement of the source to the only active vent and is tentatively linked to activity of the main dyke‐system of Mt. Etna.