Material decoupling as a mechanism of aftershock generation

NCUIR > College of Earth Sciences > Department of Earth Sciences > journal & Dissertation > Item 987654321/103786

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/103786

Title:	Material decoupling as a mechanism of aftershock generation
Authors:	陳建志;Chen, Chien-chih;Wang, Jeen-Hwa;Huang, Wen-Jeng
Contributors:	地球科學學院地球科學學系
Keywords:	Aftershocks;Clustering;Damage mechanics;Decay;Decoupling;Empirical analysis;Law;Mathematical models;Omori–Utsu law;Spring–block model;Stiffness;Temporal logic
Date:	2012-06-11
Issue Date:	2026-04-23 11:37:33 (UTC+8)
Publisher:	Elsevier;Elsevier B.V
Abstract:	摘要： Aftershocks following a large mainshock are characterized by clustering in space and time. The temporal decay in the number of aftershocks follows the empirical Omori–Utsu law. Aftershocks are regarded as delayed responses to stress changes induced by the mainshock; therefore, conventional wisdom dictates that the mechanical Maxwell or Kelvin element must be taken into account when modeling aftershock generation. We propose a novel mechanism of aftershock generation by evaluating changes in the stiffness ratio (or stiffness between two blocks) of a dynamical one-dimensional spring–block model. Simulations reveal the existence of spatiotemporal event clustering (i.e., aftershocks) associated with a preceding large event (i.e., the mainshock). In addition, the empirical Omori–Utsu law, with p~0.8, can hold for many sequences of numerical aftershocks produced in our model. Therefore, we suggest that changes in the stiffness or strength of materials play an important role in aftershock generation. ► 1-D spring–block model with varying strengths in elastic modulus is investigated. ► The empirical Omori–Utsu law holds for numerical aftershock sequences. ► Microcracking decouples a fault block from neighbors. ► Decoupling mechanism reproduces spatiotemporal clustering of aftershocks. 出版者： Elsevier B.V 出版日期： 2012-06-11 出處： Tectonophysics, 2012-06, Vol.546-547, p.56-59 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2012 識別號： ISSN: 0040-1951 識別號： EISSN: 1879-3266 識別號： DOI: 10.1016/j.tecto.2012.04.016
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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