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| Titel |
Investigation of the source of vulcanian explosions at Volcan de Colima, Mexico |
| VerfasserIn |
Mauro Palo, Enza De Lauro, Salvatore De Martino |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250039517
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| Zusammenfassung |
| We have analyzed Long Period (LP) seismic events associated with Vulcanian explosions of Volcàn de Colima (Mexico) recorded by four three-component broad-band seismometers in January 2006. Frequency-domain analysis shows broad-band spectra mainly in the range 0.3-2 Hz characterized by monotonic decreasing shape typically observed in a self-oscillating cavity interacting with a confined jet. The fundamental mode is peaked around 0.4-0.5 Hz. Independent Component Analysis, a time decomposition method extracts two or three independent signals depending on the station. These independent components are self sustained oscillations with low dimensionality characterized by a well defined frequency content. These decomposed waves have radial polarization in near field and transverse polarization at longer distance in the direction North-West South-East. All results suggest a branching of principal vertical conduit in the direction North-West South-East at a suitable height. |
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