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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 1, issue 3 | Copyright

Special issue: Seismic hazard evaluation - Part II

Nat. Hazards Earth Syst. Sci., 1, 145-158, 2001
https://doi.org/10.5194/nhess-1-145-2001
© Author(s) 2001. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  30 Sep 2001

30 Sep 2001

The pecularities of shear crack pre-rupture evolution and distribution of seismicity before strong earthquakes

D. Kiyashchenko and V. Troyan D. Kiyashchenko and V. Troyan
  • Physics Department, St. Petersburg State University, 1 Ulianovskaya Street, St. Petersburg, 198 504, Russia

Abstract. Several methods are presently suggested for investigating pre-earthquake evolution of the regions of high tectonic activity based on analysis of the seismicity spatial distribution. Some precursor signatures are detected before strong earthquakes: decrease in fractal dimension of the continuum of earthquake epicenters, cluster formation, concentration of seismic events near one of the nodal planes of the future earthquake, and others. In the present paper, it is shown that such peculiarities are typical of the evolution of the shear crack network under external stresses in elastic bodies with inhomogeneous distribution of strength. The results of computer modeling of crack network evolution are presented. It is shown that variations of the fractal dimension of the earthquake epicenters’ continuum and other precursor signatures contain information about the evolution of the destruction process towards the main rupture.

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