We discuss deterministic sequences of avalanches on a directed Bethe lattice. The approach is motivated by the phenomenon of self-organized criticality. Grains are added only at one node of the network. When the number of grains at any node exceeds a threshold b, each of k out-neighbors gets one grain. The probability of an avalanche of size s is proportional to . When the avalanche mass is conserved ( ), we get . For an application of the model to social phenomena, the conservation condition can be released. Then, the exponent is found to depend on the model parameters; . The distribution of the time duration of avalanches is exponential. Multifractal analysis of the avalanche sequences reveals their strongly non-uniform fractal organization. Maximal value of the singularity strength in the bifractal spectrum is found to be .
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