Weibull-distributed dyke thickness reflects probabilistic character of host-rock strength.
Weibull-distributed dyke thickness reflects probabilistic character of host-rock strength.
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DOI：
10.1038/ncomms4272
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发表时间：
2014
影响因子：
16.6
通讯作者：
Friese, Nadine
中科院分区：
文献类型：
--
作者：
Krumbholz, Michael;Hieronymus, Christoph F.;Burchardt, Steffi;Troll, Valentin R.;Tanner, David C.;Friese, Nadine
岩浆席状侵入体（岩墙）是地壳中岩浆运移的主要形式。岩墙的大小分布是控制火山表面变形和喷发速率的关键参数，也是真实模拟火山变形进行喷发预测所必需的。在这里，我们提出了3,676个不同构造背景的堤坝厚度测量的统计分析，并显示堤坝厚度始终遵循威布尔分布。从材料科学可知，脆性材料中的幂律分布缺陷会导致威布尔分布的失效应力。因此，我们提出了一个动态模型，其中岩墙厚度是由可变的岩浆压力，利用不同大小的主岩弱点。所观察到的岩墙厚度分布，因此，网站特定的，因为岩石强度，而不是岩浆粘度和成分，发挥主导作用的控制岩墙侵位。从根本上说，岩土材料的强度是尺度相关的，应该近似的概率分布。 了解岩墙厚度分布对于量化岩浆迁移率和改进喷发预测是必不可少的。Krumbholz等人表明，岩墙厚度呈威布尔分布，并将围岩强度确定为控制岩墙就位的主要参数。
Magmatic sheet intrusions (dykes) constitute the main form of magma transport in the Earth’s crust. The size distribution of dykes is a crucial parameter that controls volcanic surface deformation and eruption rates and is required to realistically model volcano deformation for eruption forecasting. Here we present statistical analyses of 3,676 dyke thickness measurements from different tectonic settings and show that dyke thickness consistently follows the Weibull distribution. Known from materials science, power law-distributed flaws in brittle materials lead to Weibull-distributed failure stress. We therefore propose a dynamic model in which dyke thickness is determined by variable magma pressure that exploits differently sized host-rock weaknesses. The observed dyke thickness distributions are thus site-specific because rock strength, rather than magma viscosity and composition, exerts the dominant control on dyke emplacement. Fundamentally, the strength of geomaterials is scale-dependent and should be approximated by a probability distribution. Understanding dyke thickness distributions is essential to quantify magma transport rates and improve eruption forecasting. Krumbholz et al. show that dyke thicknesses are Weibull-distributed and identify host-rock strength as the primary parameter that controls dyke emplacement.
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DOI：
10.1016/s0377-0273(00)00257-2
发表时间：
2001-03-01
影响因子：
2.9
作者：
Annen, C;Lénat, JF;Provost, A
通讯作者：
Provost, A
影响因子：
3.5
作者：
Burchardt, Steffi;Tanner, David C.;Gustafsson, Ludvik E.
通讯作者：
Gustafsson, Ludvik E.
影响因子：
3.5
作者：
Klausen, M. B.
通讯作者：
Klausen, M. B.
影响因子：
64.8
作者：
BRUCE, PM;HUPPERT, HE
通讯作者：
HUPPERT, HE
影响因子：
3.9
作者：
Buck, W. Roger;Einarsson, Pall;Brandsdottir, Bryndis
通讯作者：
Brandsdottir, Bryndis