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The 2004–2005 Mt. Etna Compound Lava Flow Field: A Retrospective Analysis by Combining Remote and Field Methods
Journal of Geophysical Research: Solid Earth ( IF 3.9 ) Pub Date : 2021-02-14 , DOI: 10.1029/2020jb020499
Alessandro Fornaciai 1 , Daniele Andronico 2 , Massimiliano Favalli 1 , Letizia Spampinato 2 , Stefano Branca 2 , Luigi Lodato 2 , Alessandro Bonforte 2 , Luca Nannipieri 1
Affiliation  

Mapping lava flows frequently during effusive eruptions provides crucial parameters to better understand their dynamics, in turn improving our ability to model lava flow behavior. New photogrammetric methods have recently been developed, shifting the paradigm of photogrammetry from pure method to a multidisciplinary approach able to reduce the cost of volcanic monitoring and widen the potential spectrum of application. In this work, we demonstrate how multi‐view and single‐view photogrammetry methods can be used effectively to extract accurate quantitative information from photographs taken during routine surveys over an active lava flow. One intriguing advantage of these methods is that they can re‐use images acquired previously to extract new data from past eruptions. In particular, we reconstructed quantitatively the evolution of the lava flow field emplaced during 2004–2005 at Mt. Etna, subdivided in five eruptive phases from the earliest simple lava flows to the final compound lava field about 6 months later. Our results show that, in the first week of eruption, lava field formation was characterized by an increasing lava length that followed a power law growth and by a decreasing front velocity that followed a power law as well. Thereafter, the length increasing became almost constant until the developed lava tube system was able to drain the lava for long distances, with the area inundated by lava that grew linearly in the first 20 days. Finally, we demonstrate the crucial role that the syn‐eruptive DEMs acquisition could have to improve our understanding of the emplacement dynamics of complex lava fields.

中文翻译:

2004-2005年。Etna复合熔岩流场:结合远程和现场方法的回顾性分析

在喷发性喷发期间经常绘制熔岩流图可提供关键参数,以更好地了解其动态,进而提高我们对熔岩流行为进行建模的能力。最近开发了新的摄影测量方法,将摄影测量的范式从纯方法转变为多学科方法,从而可以降低火山监测的成本并扩大潜在的应用范围。在这项工作中,我们演示了如何有效地使用多视图和单视图摄影测量方法从活动熔岩流常规调查期间拍摄的照片中提取准确的定量信息。这些方法的一个吸引人的优点是,它们可以重新使用以前获取的图像,以从过去的火山喷发中提取新数据。尤其是,我们定量地重建了2004年至2005年在山上熔岩流场的演化。大约六个月后,埃特纳火山从最初的简单熔岩流到最终的复合熔岩流分为五个喷发阶段。我们的结果表明,在喷发的第一周,熔岩场形成的特征是熔岩长度随幂定律增长而增加,而前沿速度也随幂定律而降低。此后,长度的增加几乎保持恒定,直到发达的熔岩管系统能够将熔岩排出很长一段距离,而熔岩所淹没的区域在开始的20天内呈线性增长。最后,我们证明了协同式DEM的采集可能在提高我们对复杂熔岩田位动力学的理解中所起的关键作用。
更新日期:2021-03-24
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