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| Titel |
Analysis of the ground vibration generated by debris flows and other torrential processes at the Rebaixader monitoring site (Central Pyrenees, Spain) |
| VerfasserIn |
C. Abancó, M. Hürlimann, J. Moya |
| 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 Sciences ; 14, no. 4 ; Nr. 14, no. 4 (2014-04-17), S.929-943 |
| Datensatznummer |
250118396
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| Publikation (Nr.) |
 copernicus.org/nhess-14-929-2014.pdf |
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| Zusammenfassung |
| Monitoring of debris flows using ground vibration sensors has increased in the last two decades. However, the correct interpretation of the signals still presents ambiguity. In the Rebaixader monitoring site (Central
Pyrenees, Spain) two different ground vibration stations are installed. At
the first station the ground velocity signal is transformed into an
impulses-per-second signal (low frequency, 1 Hz). The analysis of the data
recorded at this station show that the shape of the impulses signal is one
of the key parameters to describe the evolution of the event. At the second
station the ground velocity signal is directly recorded at high frequency
(250 Hz). The results achieved at this station show that the differences in
time series and spectral analysis are helpful to describe the temporal
evolution of the events. In addition, some general outcomes were obtained:
the attenuation of the signal with the distance has been identified as
linear to exponential; and the assembly of the geophones to the terrain has
an important effect on the amplification of the signal. All these results
highlight that the definition of ground vibration thresholds for debris-flow
detection or warning purposes is a difficult task; and that influence of
site-specific conditions is notable. |
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