Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pre-earthquake electromagnetic emissions with critical and tricritical
  behavior before the recent Durr\"es (Albania) (Mw=6.4, 26-11-2019) and Chania
  (Greece) (Mw=6.1, 27-11-2019) earthquakes   In this brief report we present evidence for the dynamics of the earthquake
(EQ) preparation processes that led to two strong events (Mw>6) that took place
in Durr\"es (Albania) and Chania (West-Crete, Greece) on 26 and 27-11-2019,
respectively. Specifically, MHz fracto-electromagnetic emissions (EME) recorded
by our telemetric stations presented critical fluctuations prior to each one of
these EQs. Subsequently, the EME possibly related to each one of these EQs
evolved differently towards the occurrence of the EQ event: the ones possibly
related to Chania EQ departed from critical state according to the symmetry
breaking phenomenon, while the ones possibly related to Durr\"es EQ departed
from critical state according to the tricritical crossover phenomenon. The
analysis was performed by means of the method of critical fluctuations (MCF).

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The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
2
The categories of this paper are: math