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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Numerical modeling of surface deformations on Mt. Vesuvius volcano (Italy) in presence of asymmmetric elastic heterogeneities
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Numerical modeling of surface deformations on Mt. Vesuvius volcano (Italy) in presence of asymmmetric elastic heterogeneities

机译：山表面变形的数值模拟。维苏威火山（意大利）存在不对称弹性异质性

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摘要

The surface displacement field at Mt. Vesuvius calculated by developing elastic asymmetric 3-D and 2-D axially symmetric finite element models is presented. The models take into account the presence of the volcanic edifice, heterogeneities of country rocks, as schematically inferred from seismic tomography, and different shapes and locations of an overpressured source. In particular, we analyze the effect on surface displacements of an asymmetric structure located below sea level underneath the crater, which is more rigid than the host rocks. We tackle the problem by first developing tractable axisymmetric models, to establish some general properties of the deformation field, and then more specific 3-D models. We find that, depending on source shape and location with respect to the rigid structure, the surface displacement field may show peculiar asymmetries that cannot be retrieved with axisymmetric models. Moreover, we find that the effect of the rigid structure and the carbonate basement is to focus the deformation field around the summit area of the volcano.
机译：山的表面位移场。提出了通过建立弹性非对称3D和2D轴向对称有限元模型计算的维苏威火山。这些模型考虑到了火山大厦的存在，乡村岩石的异质性（如从地震层析成像中推断的那样）以及超压源的不同形状和位置。特别是，我们分析了位于火山口下方海平面以下的非对称结构对表面位移的影响，该结构比基质岩石更坚硬。通过首先开发可处理的轴对称模型，建立变形场的一些常规属性，然后建立更具体的3-D模型，我们解决了该问题。我们发现，取决于源形状和相对于刚性结构的位置，表面位移场可能显示出特殊的不对称性，而这些对称性无法用轴对称模型检索。此外，我们发现刚性结构和碳酸盐基底的作用是将变形场集中在火山的顶峰区域周围。

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