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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.6: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Large and small avalanches in the Olami-Feder-Christensen earthquake model — •Felix Wissel and Barbara Drossel — Institut f. Festkoerperphysik, TU Darmstadt, Hochschulstrasse 6, 64289 Darmstadt

We investigate the nature of the different types of avalanches occurring in the Olami-Feder-Christensen Earthquake model. Analytical considerations and computer simulations of the one-dimensional model show that for sufficiently large systems the distribution of small avalanches is independent of the system size, while that for large avalanches is proportional to the system size due to large synchronized blocks. We analyze how these results are changed when the symmetry of the system is broken or quenched randomness is introduced. We compare the one- and two-dimensional system and make a prediction for the behavior of the avalanche-size distribution in 2 dimensions in the limit of large system size. This leads to the question in what sense the OFC-model can be considered as self-organized critical.