Decay of aftershock density with distance indicates triggering by dynamic stress

K. R. Felzer () and E. E. Brodsky
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K. R. Felzer: US Geological Survey
E. E. Brodsky: University of California Santa Cruz

Nature, 2006, vol. 441, issue 7094, 735-738

Abstract: Aftershock tactics Aftershocks, the most common type of earthquake, were thought to be triggered by static stresses induced by an earlier ‘mainshock’. Recent work suggested that dynamic stresses, or shaking, may also be a factor, and a study based on analysis of the earthquake locations in the 1984–2002 Southern California catalogue confirms that view. Precise measurements of the decay of aftershock density with distance show that the probability of an aftershock is consistent with a maximum amplitude of seismic shaking at distances of 0.2 to 50 km from a mainshock.

Date: 2006
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DOI: 10.1038/nature04799

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