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| Titel |
Statistical analysis of surface displacements – an example from the Åknes rockslide, western Norway |
| VerfasserIn |
T. Nordvik, E. Nyrnes |
| 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. 3 ; Nr. 9, no. 3 (2009-05-14), S.713-724 |
| Datensatznummer |
250006780
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| Publikation (Nr.) |
 copernicus.org/nhess-9-713-2009.pdf |
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| Zusammenfassung |
| Analyses of displacement measurements may provide valuable insight into the
characteristics and behaviours of landslides. This paper demonstrates the
application of statistical analysis to displacement data collected with
Global Positioning System (GPS), total stations and extensometers at the
Åknes rockslide site, western Norway. The Åknes rockslide has
particular interest due to the potential for catastrophic consequences if
the rockslide accelerates into a rock avalanche and hits the fjord below.
This would generate a tsunami in the adjacent fjord system and pose a threat
to local settlements and infrastructure as well as to the many tourists
visiting nearby areas. The analyses reported in this paper pay special
attention to the newly available time series obtained from seven permanent
GPS stations. The results from these continuously monitored GPS stations are
believed to be an important contribution to the understanding of the complex
displacement pattern evident from previous investigations. Results from the
statistical analyses show that the displacement rates can be modelled as
linear trends superimposed with periodic (sinusoidal) components. This
indicates constant average displacement rates with no persistent accelerations. The
annual displacement rates estimated from GPS and extensometer measurements
range from a few millimetres to about 8 cm, whereas the periodical
fluctuations typically have maximum amplitudes of 1–2 mm. Some
interpretations of the periodical fluctuations are presented. High
correlations between displacements and the groundwater level, measured in a
borehole at the upper part of the slope, are evident for extensometers
located across the back scarp. For the GPS control points located further
down the slope, this correlation is, however, not so clear. |
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