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| Titel |
Landslide Force History inversion: Measuring the dynamics of catastrophic landslides using seismology and satellite remote-sensing |
| VerfasserIn |
Colin Stark, Goran Ekstrom |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250050043
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| Zusammenfassung |
| Empirical constraints on the dynamics of very large landslides are hard to obtain. In principle,
such constraints are to be found in the long-period seismic waves radiated by a landslide mass
sliding down and variably loading the substrate beneath. Here we present inversions of
long-period seismograms for the time-varying forces driving catastrophic landslides at
a number of locations around the world. Once calibrated using remote-sensing
imagery and differential topographic data (where possible), these “Landslide Force
History” (LFH) inversions indicate masses of 1010–1012 kg (with volumes of around
5Ã106– 5Ã108 m3) underwent maximum accelerations in the range 1–3 m s-2. Integration of
the inverted acceleration histories indicates the mean landslide masses reached speeds of
25–75 m s-1; integration again yields the 3D relative trajectories of motion of the
landslide centers of mass, indicating travel distances of 800 m to 6000 m in 50–160 s.
Estimated rates of change of potential and kinetic energy suggest that apparent basal
friction increases during slip, with effective friction coefficients approaching around
0.3–0.6 prior to arrest. These inversion results indicate that fundamental properties of
catastrophic landsliding can be estimated through remote observation, and that global
assessment of major landslides is feasible, at least in principle, in near-realtime. |
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