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The influence of the brittle-ductile transition zone on aftershock and foreshock occurrence.


ABSTRACT: Aftershock occurrence is characterized by scaling behaviors with quite universal exponents. At the same time, deviations from universality have been proposed as a tool to discriminate aftershocks from foreshocks. Here we show that the change in rheological behavior of the crust, from velocity weakening to velocity strengthening, represents a viable mechanism to explain statistical features of both aftershocks and foreshocks. More precisely, we present a model of the seismic fault described as a velocity weakening elastic layer coupled to a velocity strengthening visco-elastic layer. We show that the statistical properties of aftershocks in instrumental catalogs are recovered at a quantitative level, quite independently of the value of model parameters. We also find that large earthquakes are often anticipated by a preparatory phase characterized by the occurrence of foreshocks. Their magnitude distribution is significantly flatter than the aftershock one, in agreement with recent results for forecasting tools based on foreshocks.

SUBMITTER: Petrillo G 

PROVIDER: S-EPMC7295783 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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The influence of the brittle-ductile transition zone on aftershock and foreshock occurrence.

Petrillo Giuseppe G   Lippiello Eugenio E   Landes François P FP   Rosso Alberto A  

Nature communications 20200615 1


Aftershock occurrence is characterized by scaling behaviors with quite universal exponents. At the same time, deviations from universality have been proposed as a tool to discriminate aftershocks from foreshocks. Here we show that the change in rheological behavior of the crust, from velocity weakening to velocity strengthening, represents a viable mechanism to explain statistical features of both aftershocks and foreshocks. More precisely, we present a model of the seismic fault described as a  ...[more]

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