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| Titel |
Ground vibrations and airborne sounds generated by motion of rock in a river bed |
| VerfasserIn |
C.-J. Huang, C.-H. Yeh, C.-Y. Chen, S.-T. Chang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 5 ; Nr. 8, no. 5 (2008-10-21), S.1139-1147 |
| Datensatznummer |
250005776
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| Publikation (Nr.) |
 copernicus.org/nhess-8-1139-2008.pdf |
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| Zusammenfassung |
| This study investigates how ground vibrations (underground sounds) and
airborne sounds that are produced by rocks in a river bed differ from each
other. Airborne and underground sounds were simultaneously received at three
microphones and three geophones, respectively. These sound signals were then
analyzed using both the Fast Fourier Transform and the Gabor Transform to
represent them in both the frequency and time-frequency domains.
Experimental data indicate that the frequency of both airborne and
underground sounds produced by the impact of rocks against the river bed is
in the range 10–150 Hz. Furthermore, the high-frequency band of underground
sounds decays much more rapidly than that of airborne sounds. The spatial
decay rate of airborne sounds was also determined and compared with
theoretical values. The lower spatial decay rate of airborne sounds than
that of underground sounds suggests that monitoring of airborne sounds may
be more efficient in the detection of debris flows or other natural hazards
that generate both airborne and underground sounds. |
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