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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Application of a plate model to reproduce surface deformations observed at Uturuncu volcano, Bolivia
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Application of a plate model to reproduce surface deformations observed at Uturuncu volcano, Bolivia

机译：板式模型在玻利维亚Uuturuncu火山中繁殖表面变形的应用

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Between 1992 and the mid 2010s, strong uplift has been observed centred on Uturuncu volcano in Bolivia. More recently it was shown that a smaller-amplitude moat of subsidence surrounds the uplift. We propose that this & ldquo;sombrero & rdquo; pattern can be the signature of elastic-plate deformation due to a buoyant fluid stored beneath it. We take the base of the & ldquo;plate & rdquo; to be the brittle ductile transition which, in this region, is shallow when compared with the crustal thickness. First, we show experimentally that this type of storage can produce the observed de-formation pattern. Secondly, we adapt a plate deformation model and use it to invert the surface deformation published by Henderson and Pritchard (2017). A total of 1681 inversions was performed to span the wide range of physical-parameter values. We found that our model can find a source that reproduces the vertical de-formation well for a large range of parameters. The viable sources mostly correspond to a thin plate ( 5 km) or a magma with high buoyancy (possibly suggesting the presence of a volatile phase in the storage zone). Interest-ingly, the petrologically-determined magma storage depth before the last eruption of Uturuncu ( 4 +/- 2 km) is approximately the same as the plate thickness deduced. The radial displacement is less correctly reproduced than the vertical. The, at most, 15.6 m magma layer needed to reproduce the total observed uplift since 1992 is smaller than the typical thickness for seismic detection, which can explain why it was not detected. Storage of buoyant silicic magma at a shallow brittle-ductile transition in hot continental crust may be applicable to other large silicic systems.(c) 2021 Published by Elsevier B.V.
机译：于1992年至2010年中期，在玻利维亚的Uturuncu火山上观察到强大的隆起。最近，有人认为，沉降的沉积幅度较小的护城河围绕着隆起。我们建议这个＆ldquo; sombrero＆rdquo;由于存储在其中的浮力流体，图案可以是弹性板变形的签名。我们占据了＆ldquo的基础;板块＆rdquo;作为与地壳厚度相比，在该区域中的脆性韧性转变浅。首先，我们通过实验展示这种类型的存储可以产生观察到的去形成模式。其次，我们调整板变形模型，并使用它来颠倒亨德森和普里查德（2017）发布的表面变形。执行总共1681个逆转以跨越各种物理参数值。我们发现，我们的模型可以找到再现垂直变形井的源，以实现大量参数。可行的来源主要对应于具有高浮力的薄板（5km）或岩浆（可能表明在储存区中存在挥发相）。有趣的是，岩石学 - 确定的岩浆岩浆存储深度在UTURuncu（4 +/- 2 km）的最后一次喷发之前与推导的板厚度大致相同。径向位移比垂直较少再现。最多15.6米的岩浆层需要自1992自1992自1992年的总观察到的隆起，则典型的地震检测厚度可以解释为什么未检测到它。在热大陆地壳的浅脆性转换下储存浮力硅岩浆可能适用于其他大型硅系统。（c）由elsevier b.v出版的2021年。

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