Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Viscoelastic Effects in Avalanche Dynamics: A Key to Earthquake
  Statistics   In many complex systems a continuous input of energy over time can be
suddenly relaxed in the form of avalanches. Conventional avalanche models
disregard the possibility of internal dynamical effects in the inter-avalanche
periods, and thus miss basic features observed in some real systems. We address
this issue by studying a model with viscoelastic relaxation, showing how
coherent oscillations of the stress field can emerge spontaneously. Remarkably,
these oscillations generate avalanche patterns that are similar to those
observed in seismic phenomena.

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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc