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| Titel |
Is Pressure Stimulated Current relaxation in amphibolite a case of non-extensivity ? |
| VerfasserIn |
F. Vallianatos, D. Triantis |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069286
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| Zusammenfassung |
| The application of uniaxial stress on rocks is accompanied by the production of an electric signal which is described by the term Pressure Stimulated Current (PSC) (Vallianatos et al., 2004). In this work the High Rate Step Stress (HRSS) technique (Alexandridis et al., 2012) is applied, and the PSC relaxation in amphibolite samples from KTB drilling, is studied, presented and commented in the frame of non-extensive statistical mechanics (Tsallis 2009). After the application of an abrupt stress step, a PSC spike is recorded at a PSCmax value, and the PSC decreases gradually right after the stress stabilization.
PSCs relaxation in uniaxial compressed rocks follows a generalized exponential function which explicitly introduces hierarchically constrained dynamics and macroscopic interactions. The interactions are associated with the non-extensive entropy parameter q and exhibit a behavior indicating a dependence with normalized uniaxial stress Σ=σ/σy, where σy is the yield stress where deviation from the elastic region starts in a stress-strain curve. The stress-dependent q-estimation leads to the conclusion that fracturing is a subextensive process with strong interaction.
Acknowledgments. This work was partly supported by the THALES Program of the Ministry of Education of Greece and the European Union in the framework of the project entitled "Integrated understanding of Seismicity, using innovative Methodologies of Fracture mechanics along with Earthquake and non extensive statistical physics – Application to the geodynamic system of the Hellenic Arc. SEISMO FEAR HELLARC".
References
Alexandridis, A., Triantis, D., Stavrakas, I., Stergiopoulos, C., 2012. A neural network approach for compressive strength prediction in cement-based materials through the study of pressure-stimulated electrical signals, Construction and Building Materials 30, 294–300.
Tsallis, C., 2009. Introduction to Nonextensive Statistical Mechanics: Approaching a Complex World. Springer, Berlin, 1-378.
Vallianatos, F., Triantis, D., Tzanis, A., Anastasiadis, C, Stavrakas, I., 2004. Electric earthquake precursors: From laboratory results to field observations, Physics and Chemistry of the Earth 29 (4-9), 339-351. |
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