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| Titel |
Complex networks and waveforms from acoustic emissions in laboratory earthquakes |
| VerfasserIn |
H. O. Ghaffari, B. D. Thompson, R. P. Young |
| 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 ; 21, no. 4 ; Nr. 21, no. 4 (2014-07-24), S.763-775 |
| Datensatznummer |
250120928
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| Publikation (Nr.) |
 copernicus.org/npg-21-763-2014.pdf |
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| Zusammenfassung |
| Understanding the physics of acoustic excitations
emitted during the cracking of materials is one of the long-standing
challenges for material scientists and geophysicists. In this
study, we report novel results of applications of functional complex
networks on acoustic emission waveforms emitted during the evolution of
frictional interfaces. Our results show that laboratory faults at
microscopic scales undergo a sequence of generic phases, including
strengthening, weakening or fast slip and slow slip, leading to healing. For
the first time we develop a formulation on the dissipated energy due to
acoustic emission signals in terms of short-term and long-term features
(i.e., networks' characteristics) of events. We illuminate the transition
from regular to slow ruptures. We show that this transition can lead to the
onset of the critical rupture class similar to the direct observations of
this phenomenon in the transparent samples. Furthermore, we demonstrate the
detailed submicron evolution of the interface due to the short-term
evolution of the rupture tip. As another novel result, we find that the
nucleation phase of most amplified events follows a nearly constant timescale,
corresponding to the initial strengthening or locking of the
interface. This likely indicates that a thermally activated process can play
a crucial role near the moving crack tip. |
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