Long-range automaton models of earthquakes: Power-law accelerations, correlation evolution, and mode-switching

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	Long-range automaton models of earthquakes: Power-law accelerations, correlation evolution, and mode-switching
	Weatherley D; Mora P; Xia MF(夏蒙棼)
刊名	Pure and Applied Geophysics
	2002
卷号	159 期号:10 页码:2469-2490
关键词	Critical Point Hypothesis Cellular Automata Correlation Evolution Seismicity Release Cannot Stress Energy Faults
ISSN号	0033-4553
通讯作者	Weatherley, D (reprint author), Univ Queensland, QUAKES, Brisbane, Qld 4072, Australia.
中文摘要	We introduce a conceptual model for the in-plane physics of an earthquake fault. The model employs cellular automaton techniques to simulate tectonic loading, earthquake rupture, and strain redistribution. The impact of a hypothetical crustal elastodynamic Green's function is approximated by a long-range strain redistribution law with a r(-p) dependance. We investigate the influence of the effective elastodynamic interaction range upon the dynamical behaviour of the model by conducting experiments with different values of the exponent (p). The results indicate that this model has two distinct, stable modes of behaviour. The first mode produces a characteristic earthquake distribution with moderate to large events preceeded by an interval of time in which the rate of energy release accelerates. A correlation function analysis reveals that accelerating sequences are associated with a systematic, global evolution of strain energy correlations within the system. The second stable mode produces Gutenberg-Richter statistics, with near-linear energy release and no significant global correlation evolution. A model with effectively short-range interactions preferentially displays Gutenberg-Richter behaviour. However, models with long-range interactions appear to switch between the characteristic and GR modes. As the range of elastodynamic interactions is increased, characteristic behaviour begins to dominate GR behaviour. These models demonstrate that evolution of strain energy correlations may occur within systems with a fixed elastodynamic interaction range. Supposing that similar mode-switching dynamical behaviour occurs within earthquake faults then intermediate-term forecasting of large earthquakes may be feasible for some earthquakes but not for others, in alignment with certain empirical seismological observations. Further numerical investigation of dynamical models of this type may lead to advances in earthquake forecasting research and theoretical seismology.
类目[WOS]	Geochemistry & Geophysics
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	SEISMICITY ; RELEASE ; CANNOT ; STRESS ; ENERGY ; FAULTS
收录类别	SCI
语种	英语
WOS记录号	WOS:000177938400015
公开日期	2009-08-03 ; 2010-06-13
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/33679]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Weatherley D,Mora P,Xia MF. Long-range automaton models of earthquakes: Power-law accelerations, correlation evolution, and mode-switching[J]. Pure and Applied Geophysics,2002,159(10):2469-2490.
APA	Weatherley D,Mora P,&夏蒙棼.(2002).Long-range automaton models of earthquakes: Power-law accelerations, correlation evolution, and mode-switching.Pure and Applied Geophysics,159(10),2469-2490.
MLA	Weatherley D,et al."Long-range automaton models of earthquakes: Power-law accelerations, correlation evolution, and mode-switching".Pure and Applied Geophysics 159.10(2002):2469-2490.