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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Modelling ground deformation patterns associated with volcanic processes at the Okataina Volcanic Centre
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Modelling ground deformation patterns associated with volcanic processes at the Okataina Volcanic Centre

机译：在Okataina火山中心模拟与火山过程相关的地面变形模式

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The Okataina Volcanic Centre (OVC) is one of two large active rhyolite centres in the modern Taupo Volcanic Zone (1VZ) in the North Island of New Zealand. It is located in a complex section of the Taupo rift, a tectonically active section of the TVZ. The most recent volcanic unrest at the OVC includes the similar to 1315 CE Kaharoa and 1886 Tarawera eruptions. Current monitoring activity at the OVC includes the use of continuous GPS receivers (cGPS), lake levelling and seismographs. The ground deformation patterns preceding volcanic activity the OVC are poorly constrained and restricted to predictions from basic modelling and comparison to other volcanoes worldwide. A better understanding of the deformation patterns preceding renewed volcanic activity is essential to determine if observed deformation is related to volcanic, tectonic or hydrothermal processes. Such an understanding also means that the ability of the present day cGPS network to detect these deformation patterns can also be assessed. The research presented here uses the finite element (FE) modelling technique to investigate ground deformation patterns associated with magma accumulation and diking processes at the OVC in greater detail. A number of FE models are produced and tested using Pylith software and incorporate characteristics of the similar to 1315 CE Kaharoa and 1886 Tarawera eruptions, summarised from the existing body of research literature. The influence of a simple ring fault structure at the OVC on the modelled deformation is evaluated. The ability of the present-day continuous GPS (cGPS) GeoNet monitoring network to detect or observe the modelled deformation is also considered. The results show the modelled horizontal and vertical displacement fields have a number of key features, which include prominent lobe based regions extending northwest and southeast of the OVC. The results also show that the ring fault structure increases the magnitude of the displacements inside the caldera, in particular in the vicinity of the southern margin. As a result, some of the cGPS stations in the vicinity of the OVC are more important for measuring deformation related to volcanic processes than others. The results have important implications for how any future observed deformation at the OVC is observed and interpreted. (C) 2017 Elsevier B.V. All rights reserved.
机译：奥卡塔纳火山中心（OVC）是新西兰北岛现代陶波火山带（1VZ）中两个大型活动流纹岩中心之一。它位于Taupo裂谷的复杂区域，即TVZ的构造活动区域。 OVC最近的火山动乱包括类似于1315年的卡哈罗阿火山和1886年的塔拉威拉火山喷发。 OVC当前的监视活动包括使用连续GPS接收器（cGPS），湖泊水准仪和地震仪。 OVC火山活动之前的地面变形模式受到的约束较弱，并且仅限于基本模型的预测以及与全球其他火山的比较。要确定观察到的变形是否与火山，构造或热液过程有关，必须对新的火山活动之前的变形模式有更好的了解。这种理解还意味着，当今的cGPS网络检测这些变形模式的能力也可以得到评估。这里介绍的研究使用有限元（FE）建模技术来更详细地研究与OVC处的岩浆堆积和堤防过程相关的地面变形模式。使用Pylith软件生产和测试了许多有限元模型，这些模型合并了类似于1315 CE Kaharoa和1886 Tarawera火山爆发的特征，并从现有研究文献中进行了总结。评估了OVC处简单的环形断层结构对建模变形的影响。还考虑了当今的连续GPS（cGPS）GeoNet监视网络检测或观察建模变形的能力。结果表明，建模的水平和垂直位移场具有许多关键特征，其中包括在OVC西北和东南延伸的突出的叶基区域。结果还表明，环形断层结构增加了破火山口内部位移的幅度，特别是在南缘附近。结果，OVC附近的某些cGPS站比其他cGPS站对测量与火山作用有关的形变更为重要。该结果对于如何观察和解释OVC处未来观察到的变形具有重要意义。 （C）2017 Elsevier B.V.保留所有权利。

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