Interevent Correlations from Avalanches Hiding Below the Detection Threshold

Sanja Janicevic, Lasse Laurson, Knut Jørgen Måløy, Stephane Santucci, Mikko Alava

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)
337 Downloads (Pure)

Abstract

Numerous systems ranging from deformation of materials to earthquakes exhibit bursty dynamics, which consist of a sequence of events with a broad event size distribution. Very often these events are observed to be temporally correlated or clustered, evidenced by power-law-distributed waiting times separating two consecutive activity bursts. We show how such interevent correlations arise simply because of a finite detection threshold, created by the limited sensitivity of the measurement apparatus, or used to subtract background activity or noise from the activity signal. Data from crack-propagation experiments and numerical simulations of a nonequilibrium crack-line model demonstrate how thresholding leads to correlated bursts of activity by separating the avalanche events into subavalanches. The resulting temporal subavalanche correlations are well described by our general scaling description of thresholding-induced correlations in crackling noise.
Original languageEnglish
Article number230601
Pages (from-to)1-6
JournalPhysical Review Letters
Volume117
DOIs
Publication statusPublished - 1 Dec 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Avalanche dynamics
  • Waiting time distributions
  • Crackling noise
  • crack growth
  • earthquake

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