Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hypocenter interval statistics between successive earthquakes in the
  two-dimensional Burridge-Knopoff model   We study statistical properties of spatial distances between successive
earthquakes, the so-called hypocenter intervals, produced by a two-dimensional
(2D) Burridge-Knopoff model involving stick-slip behavior. It is found that
cumulative distributions of hypocenter intervals can be described by the
$q$-exponential distributions with $q<1$, which is also observed in nature. The
statistics depend on a friction and stiffness parameters characterizing the
model and a threshold of magnitude. The conjecture which states that $q_t+q_r
\sim 2$, where $q_t$ and $q_r$ are an entropy index of time intervals and
spatial intervals, respectively, can be reproduced semi-quantitatively. It is
concluded that we provide a new perspective on the Burridge-Knopoff model which
addresses that the model can be recognized as a realistic one in view of the
reproduction of the spatio-temporal interval statistics of earthquakes on the
basis of nonextensive statistical mechanics.

20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin