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| Titel |
Towards rockfall forecasting through observing deformations and listening to microseismic emissions |
| VerfasserIn |
D. Arosio, L. Longoni, M. Papini, M. Scaioni, L. Zanzi, M. Alba |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2009-07-15), S.1119-1131 |
| Datensatznummer |
250006876
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1119-2009.pdf |
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| Zusammenfassung |
| Reliable forecasting of rockfall is a challenging task, mainly because of
the lack of clearly noticeable forerunners as well as due to the geological
and geo-mechanical complexity of the rock movements involved. Conventional
investigation devices still present some drawbacks, since most measurements
are generally carried out at isolated locations as well as on the surface
only. Novel remote-sensing monitoring instruments, such as Terrestrial Laser Scanning (TLS)
and Ground-Based Interferometric Synthetic Aperture Radars (GB-InSAR), are capable of inspecting
an unstable slope with a high spatial and temporal frequency. But they still
rely on measurements of the failure surface, from which displacement or
velocity are measured. On the contrary, acoustic emission/microseismic
monitoring may provide a deeper insight of stress and strain conditions
within the sub-surface rock mass. In fact, the capability to detect
microseismic events originating within an unstable rock mass is a key
element in locating growing cracks and, as a consequence, in understanding
the slide kinematics and triggering mechanisms of future collapses. Thus, a
monitoring approach based on the combination of classical methodologies,
remote sensing techniques and microseismic investigations would be a promising
research field. In the present paper we discuss the technologies and we
illustrate some experiments conducted in the framework of a project whose
final goal is the installation of an integrated monitoring and alerting
system on a rockface nearby Lecco (Italy). In particular, we present a
review of performances and applications of remote sensing devices and some
results concerning a terrestrial laser scanner preliminary campaign. Then,
we report findings regarding amplitude, frequency content and rate of
signals recorded during an in situ test carried out to evaluate the
performance of three different microseismic transducers. |
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