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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Numerical inversion and analysis of tephra fallout deposits from the 472 AD sub-Plinian eruption at Vesuvius (Italy) through a new best-fit procedure
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Numerical inversion and analysis of tephra fallout deposits from the 472 AD sub-Plinian eruption at Vesuvius (Italy) through a new best-fit procedure

机译：通过一种新的最佳拟合方法，对维苏威（意大利）的472 AD次普林纪火山爆发中的特弗拉沉积物进行了数值反演和分析

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摘要

A simple semi-analytical model for ash-fall deposit was applied to reconstruct the tephra deposits of the sub-Plinian 472 AD eruption of Vesuvius, Italy, which is of the scale of the reference eruptive scenario for the emergency planning, at Vesuvius. Applying a novel least-squares method, the bulk grain-size distribution, the total mass, and the eruption column height were obtained by fitting the computed ground load and granulometries with the observed ones. The analysis of the effect of three different weighting factors in the minimization procedure was also performed. Results showed that the statistical weighting factor produced the minimum bias. The best correlation between calculated and measured deposit was found, even though the quantity of the input data was not very high, as it commonly occurs for several ancient eruptions. Model results were also in agreement with estimations provided by other independent methods.
机译：一个简单的灰分沉积物半分析模型被用于重建意大利维苏威火山的次普林尼时代472 AD喷发的特非拉沉积物，其规模相当于维苏威火山应急计划的参考喷发情景。应用一种新颖的最小二乘法，通过将计算出的地面载荷和粒度与观测值相匹配，可以得到整体粒度分布，总质量和喷发柱高。还对最小化过程中三个不同加权因子的影响进行了分析。结果表明，统计加权因子产生了最小偏差。即使输入数据的数量不是很高，也发现了计算和测量的沉积物之间的最佳关联，因为这通常发生在几次古代喷发中。模型结果也与其他独立方法提供的估计一致。

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