Natural time analysis of critical phenomena: The case of acoustic emissions in triaxially deformed Etna basalt |
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Authors: | Filippos Vallianatos George Michas Phil Benson Peter Sammonds |
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Institution: | 1. Institute for Risk and Disaster Reduction, University College London, Gower Str., London, WC1E 6BT, UK;2. Technological Educational Institute of Crete, Laboratory of Geophysics and Seismology, Crete, Greece;3. Rock Mechanics Laboratory, School of Earth and Environment, University of Portsmouth, Burnaby Building, PO1 3QL, UK |
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Abstract: | Acoustic emissions exhibit complex correlations between space, time, and magnitude. As such, they present a unique example for a complex time series. We apply the recently introduced method of natural time analysis, which enables the detection of long-range temporal correlations even in the presence of heavy tails and find that the acoustic emissions exhibits features similar to that of other equilibrium or non-equilibrium critical systems such as worldwide seismicity as presented in the Centennial earthquake catalogue which includes global seismicity events with magnitude Mw>7.0. These results support the universal behaviour of the fracturing processes from the laboratory to the global scale. |
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Keywords: | Natural time analysis Acoustic emissions Seismicity Fracture |
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