Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigation of the seismicity after the initiation of a Seismic
  Electric Signal activity until the main shock   The behavior of seismicity in the area candidate to suffer a main shock is
investigated after the observation of the Seismic Electric Signal activity
until the impending mainshock. This makes use of the concept of natural time
$\chi$ and reveals that the probability density function of the variance
$\kappa_1(=< \chi^2 > -< \chi > ^2)$ exhibits distinct features before the
occurrence of the mainshock. Examples are presented, which refer to magnitude
class 6.0 earthquakes that occurred in Greece during the first two months in
2008.

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The categories of this paper are: hep-ph
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ