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首页> 外文期刊>Pure and Applied Geophysics >Topographically Predicted Vertical Gravity Gradient Field and Its Applicability in 3D and 4D Microgravimetry: Etna (Italy) Case Study
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Topographically Predicted Vertical Gravity Gradient Field and Its Applicability in 3D and 4D Microgravimetry: Etna (Italy) Case Study

机译：地形预测的垂直重力梯度场及其在3D和4D微血症中的适用性：etna（意大利）案例研究

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摘要

Some geophysical or geodynamic applications require the use of true vertical gradient of gravity (VGG). This demand may be associated with reductions of or corrections to observed gravity or its spatiotemporal changes. In the absence of in situ measured VGG values, the constant value of the theoretical (normal) free air gradient (FAG) is commonly used. We propose an alternative to this practice which may significantly reduce systematic errors associated with the use of constant FAG. The true VGG appears to be better approximated, in areas with prominent and rugged topography, such as alpine or some volcanic regions, by a value based on the modelled contribution of the topographic masses to the gradient. Such prediction can be carried out with a digital elevation model (DEM) of sufficient resolution and accuracy. Here we present the VGG field computed for Mt. Etna (Italy), one of the most active and best monitored volcanoes worldwide, to illustrate how strongly the VGG deviates spatially from constant FAG. The predicted (modelled) VGG field is verified by in situ observations. We also take a look at the sensitivity of the VGG prediction to the resolution and quality of used DEMs. We conclude with discussing the applicability of the topo-predicted VGG field in near surface structural and volcanological micro-gravimetric studies.
机译：一些地球物理或地球动力学应用需要使用真正的重力梯度（VGG）。这种需求可以与观察到的重力或其时空变化的减少或校正相关联。在没有原位测量的VGG值的情况下，通常使用理论（正常）自由空气梯度（FAG）的恒定值。我们提出了这种做法的替代方案，这可能会显着降低与使用恒定FAG相关的系统误差。真正的vgg似乎在具有突出和坚固的地形的区域，例如高山或某些火山区域的区域，通过基于地形肿块对梯度的建模贡献的价值。这种预测可以用足够的分辨率和精度的数字高度模型（DEM）进行。在这里，我们介绍了为MT.Etna（意大利）计算的VGG字段，全球最活跃和最佳被监测的火山之一，以说明VGG从恒定的FAG空间偏离的强烈偏离。通过原位观察验证预测（建模）VGG字段。我们还要看看VOGP预测对二手DEM的分辨率和质量的敏感性。我们结论讨论了Topo-Prediced VGG场在近地表结构和火山学微量重量研究中的适用性。

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