Using TanDEM-X to measure pyroclastic flow source location, thickness and volume: Application to the 3rd June 2018 eruption of Fuego volcano, Guatemala
Using TanDEM-X to measure pyroclastic flow source location, thickness and volume: Application to the 3rd June 2018 eruption of Fuego volcano, Guatemala
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DOI：
10.1016/j.jvolgeores.2020.107063
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发表时间：
2020-11-15
影响因子：
2.9
通讯作者：
Marroquin, G. A. Chigna
中科院分区：
文献类型：
--
作者：
Albino, F.;Biggs, J.;Marroquin, G. A. Chigna
估计正在进行的火山喷发期间的火山流量具有挑战性，但这些信息对于改进风险评估和预测未来事件至关重要。虽然以前的研究已经表明，TanDEM-X卫星数据能够推导出喷涌喷发期间熔岩流场的厚度和体积，但尚未对火山碎屑流的方法进行探索。利用双静干涉测量法，我们在危地马拉的富埃戈火山上生成了TanDEM-X DEM，以测量2018年6月3日火山喷发造成的显著地形变化，该火山喷发摧毁了San Miguel Los Lotes镇。我们估计火山碎屑密度流（PDCs）的体积为15.1 +/- 4.2 x 10(6) m(3)。这些沉积物很可能成为未来雨季火山泥流的来源。我们确定了沉积的主要通道（正高程变化）和火山碎屑物质的来源区域，显著的底物侵蚀区域和植被破坏（负高程变化）。我们的研究结果表明，2018年6月3日的火山碎屑流主要由靠近火山口的位置重力塌陷的物质组成。被侵蚀的物质增加了流动的体积（膨胀），并可能导致2018年PDC的运行距离比以前的喷发（1999-2017）要大。这项研究突出了遥感技术在积极监测难以到达地点的地形变化和迅速得出沉积物量方面的潜力。(C) 2020作者。Elsevier B.V.出版
The estimation of the volume of volcanic flows during an ongoing eruption is challenging but this information is crucial for improving risk assessment and for forecasting future events. Although previous studies have shown the ability of TanDEM-X satellite data to derive the thickness and the volume of lava flow fields during effusive eruptions, the method has not been explored yet for pyroclastic flows. Using bi-static interferometry, we produce TanDEM-X DEM on Fuego volcano (Guatemala) to measure the significant topographic changes caused by the 3rd June 2018 eruption, which destroyed the town of San Miguel Los Lotes. We estimate the volume of the Pyroclastic Density Currents (PDCs) to be 15.1 +/- 4.2 x 10(6) m(3). The deposits are likely to be the source of lahars during future rainy seasons. We identify the main channel of deposition (positive elevation changes) and the source region of pyroclastic material, areas of significant substrate erosion, and vegetation destruction (negative elevation changes). Our results show that the June 3rd 2018 pyroclastic flow was predominantly composed of material which had gravitationally collapsed from a location close to the vent. The eroded material increased the volume of the flow (bulking) and likely caused the run-out distance of the 2018 PDC to be larger than previous eruptions (1999-2017). This study highlights the potential of remote sensing techniques for actively monitoring topography changes in inaccessible locations and to rapidly derive deposit volumes. (C) 2020 The Authors. Published by Elsevier B.V.