Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 5 1 2005 10.5194/nhess-5-11-2005 http://www.nat-hazards-earth-syst-sci.net/5/11/2005/ http://www.nat-hazards-earth-syst-sci.net/5/11/2005/nhess-5-11-2005.html http://www.nat-hazards-earth-syst-sci.net/5/11/2005/nhess-5-11-2005.pdf 11 15 2005-01-03 Non double couple seismic sources, faults interaction and hypothesis of self-organized criticality S. Yunga A. Lutikov O. Molchanov Institute of Physics of the Earth, Russian Academy of Sciences, B. Gruzinskaya 10, Moscow, 123995, Russia Geophysical Survey, Russian Academy of Sciences, B. Gruzinskaya 10, Moscow, 123995, Russia Non double couple (NDC) sources are considered in framework of the hypothesis that the process of seismic rupture can be viewed as a result of complicated fault geometry and its segmentation. Analytical approach is found to reveal reliability of NDC measure taking into consideration the values of seismic moment tensor errors. The study focuses on the comparison of the deformation modes of the NDC sources with the stress states in its vicinity. The deformation modes of faulting and fracturing at a small scale in NDC earthquake focus and at regional scale in geological unit were investigated using at the last case summation of seismic moment tensors. These local and regional deformation modes in some of geodynamic regimes confirm the self-similarity assumption. For the whole data set scaling relations seem to be more complicated. This feature implies that besides stresses second order factors, as the hydrothermal or magmatic pore fluids in rock, influence source characteristics and bring new complications in scaling relations.