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Earthquake Sequencing: Chimera States with Kuramoto Model Dynamics on Directed Graphs : Volume 2, Issue 1 (20/02/2015)

By Vasudevan, K.

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Book Id: WPLBN0004020138
Format Type: PDF Article :
File Size: Pages 38
Reproduction Date: 2015

Title: Earthquake Sequencing: Chimera States with Kuramoto Model Dynamics on Directed Graphs : Volume 2, Issue 1 (20/02/2015)  
Author: Vasudevan, K.
Volume: Vol. 2, Issue 1
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Cavers, M., Ware, A., & Vasudevan, K. (2015). Earthquake Sequencing: Chimera States with Kuramoto Model Dynamics on Directed Graphs : Volume 2, Issue 1 (20/02/2015). Retrieved from http://hawaiilibrary.net/


Description
Description: Department of Mathematics and Statistics, University of Calgary, Calgary, Alberta T2N 1N4, Canada. Earthquake sequencing studies allow us to investigate empirical relationships among spatio-temporal parameters describing the complexity of earthquake properties. We have recently studied the relevance of Markov chain models to draw information from global earthquake catalogues. In these studies, we considered directed graphs as graph theoretic representations of the Markov chain model, and analyzed their properties. Here, we look at earthquake sequencing itself as a directed graph. In general, earthquakes are occurrences resulting from significant stress-interactions among faults. As a result, stress-field fluctuations evolve continuously. We propose that they are akin to the dynamics of the collective behaviour of weakly-coupled non-linear oscillators. Since mapping of global stress-field fluctuations in real time at all scales is an impossible task, we consider an earthquake zone as a proxy for a collection of weakly-coupled oscillators, the dynamics of which would be appropriate for the ubiquitous Kuramoto model. In the present work, we apply the Kuramoto model to the non-linear dynamics on a directed graph of a sequence of earthquakes. For directed graphs with certain properties, the Kuramoto model yields synchronization, and inclusion of non-local effects evokes the occurrence of chimera states or the co-existence of synchronous and asynchronous behaviour of oscillators. In this paper, we show how we build the directed graphs derived from global seismicity data. Then, we present conditions under which chimera states could occur and subsequently, point out the role of Kuramoto model in understanding the evolution of synchronous and asynchronous regions.

Summary
Earthquake sequencing: Chimera states with Kuramoto model dynamics on directed graphs

Excerpt
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