Simulated Annealing for volcano muography

Simulated Annealing for volcano muography
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火山微谱分析的模拟退火

DOI:
10.1016/j.jsames.2021.103248
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发表时间:
2021
影响因子:
1.8
通讯作者:
Vesga-Ramírez A
Vesga-Ramírez A
中科院分区:
地球科学4区
文献类型:
--
作者:
Vesga-Ramírez A

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μ照相或μ子射线照相是一种依赖高能大气μ子的非侵入性新兴图像技术,它补充了其他标准地球物理工具来了解地球地下。这项工作讨论了一种基于模拟退火算法的火山μ照相地球物理反演方法,使用μ子通量的半经验模型来达到火山地形和岩石中μ子能量损失的框架。退火算法从“观察到的”μ子通量开始,获得Cerro Machín火山(哥伦比亚托利马)合成模型内最佳相关的内部密度分布函数。估计的初始密度模型是用GEOMODELER获得的,适用于火山地形。我们改进了这个模型,包括从火山口,圆顶和相关地区的岩石密度的样本,在本文中,我们确定了最小μ子能量(到达方向的函数)需要通过火山建设,新兴的综合通量的μ子,和Cerro Machin模型内的密度分布。目前的反演正确地重建了Machín内部的密度差异,相对于我们的初始模拟模型,误差在1%以内,在火山管道,包裹岩石和火山口区域之间提供了显着的密度对比。
Muography or muon radiography is a non-invasive emerging image technology relying on high energy atmospheric muons, which complements other standard geophysical tools to understand the Earth’s subsurface.This work discusses a geophysical inversion methodology for volcanic muography, based on the Simulated Annealing algorithm, using a semi-empirical model of the muon flux to reach the volcano topography and a framework for the energy loss of muons in rock.The Metropolis-Simulated-Annealing algorithm starts from an “observed” muon flux and obtains the best associated inner density distribution function inside a syntetic model of the Cerro Machín Volcano (Tolima-Colombia). The estimated initial density model was obtained with GEOMODELER, adapted to the volcano topography. We improved this model by including rock densities from samples taken from the crater, the dome and the areas associated with fumaroles.In this paper we determined the minimum muon energy (a function of the arrival direction) needed to cross the volcanic building, the emerging integrated flux of muons, and the density profile inside a model of Cerro Machin. The present inversion correctly reconstructed the density differences inside the Machín, within a 1% error concerning our initial simulation model, giving a remarkable density contrast between the volcanic duct, the encasing rock and the fumaroles area.
用于研究加莱拉斯火山内部结构的 μ 子探测器原型的设计和构建
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