Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The influence of the brittle-ductile transition zone on aftershock and
  foreshock occurrence   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.

24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin