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| Titel |
Statistical analysis of Stromboli VLP tremor in the band [0.1-0.5] Hz: some consequences for vibrating structures |
| VerfasserIn |
E. Lauro, S. Martino, M. Falanga, M. Palo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 13, no. 4 ; Nr. 13, no. 4 (2006-08-10), S.393-400 |
| Datensatznummer |
250011808
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| Publikation (Nr.) |
 copernicus.org/npg-13-393-2006.pdf |
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| Zusammenfassung |
| We analyze time series of Strombolian volcanic tremor, focusing our
attention on the frequency band [0.1–0.5] Hz (very long period
(VLP) tremor). Although this frequency band is largely affected by
noise, we evidence two significant components by using Independent
Component Analysis with the frequencies, respectively, of ~0.2 and
~0.4 Hz. We show that these components display wavefield
features similar to those of the high frequency Strombolian signals
(>0.5 Hz). In fact, they are radially polarised and located
within the crater area. This characterization is lost when an
enhancement of energy appears. In this case, the presence of
microseismic noise becomes relevant. Investigating the entire large
data set available, we determine how microseismic noise
influences the signals. We ascribe the microseismic noise source
to Scirocco wind. Moreover, our analysis allows one to evidence that the Strombolian
conduit vibrates like the asymmetric cavity associated with musical
instruments generating self-sustained tones. |
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