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| Titel |
Oscillations in critical shearing, application to fractures in glaciers |
| VerfasserIn |
A. Pralong |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 13, no. 6 ; Nr. 13, no. 6 (2006-12-12), S.681-693 |
| Datensatznummer |
250011877
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| Publikation (Nr.) |
 copernicus.org/npg-13-681-2006.pdf |
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| Zusammenfassung |
| Many evidences of oscillations accompanying the acceleration of critical
systems have been reported. These oscillations are usually related to
discrete scale invariance properties of the systems and exhibit a
logarithmic periodicity. In this paper we propose another explanation for
these oscillations in the case of shearing fracture. Using a continuum
damage model, we show that oscillations emerge from the anisotropic
properties of the cracks in the shearing fracture zone. These oscillations
no longer exhibit a logarithmic but rather a power-law periodicity. The
power-periodic oscillation is a more general formulation. Its reduces to a
log-periodic oscillation when the exponent of the power-law
equals one. We apply this model to fit the measured displacements of
unstable ice masses of hanging glaciers for which data are available.
Results show that power-periodic oscillations adequately fit the
observations. |
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