Anomalies of critical state in fracturing geophysical objects
- 1Ioffe Physico-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
- 2Arctic and Antarctic Research Institute, 38 Bering street, 199397 St. Petersburg, Russia
Abstract. Non-linear time-sequences of fracture-related events were studied in drifting sea-ice and fracturing rock. A reversible drop of the b-value was detected prior to the large-scale sea-ice cover fragmentation, when the time sequence of impact interactions between ice-fields was fully decorrelated. A similar loss of the temporal invariance of the fracture process was revealed in the time sequence of microfracture events detected in a loaded rock sample. These temporal gaps in the continuous critical state of the considered self-organizing, open systems were attributed to the property of hierarchicity inherent in the geophysical objects. A combination of scaling and hierarchic features in the behavior of fracturing solids manifests itself in the heterogeneity of the temporal pattern of fracture process.