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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Thermal evolution of the Crater Lake of Copahue Volcano with ASTER during the last quiescence period between 2000 and 2012 eruptions
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Thermal evolution of the Crater Lake of Copahue Volcano with ASTER during the last quiescence period between 2000 and 2012 eruptions

机译：2000年至2012年爆发期间，在最后一个静态期间与艾斯特的Cahaue火山火山口湖的热演变

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摘要

Active Crater Lakes are the surface expression of volcanic activity at the top of complex magmatic-hydrothermal systems. The Volcanic and Hydrothermal System Copahue is one of the most important active systems in Argentina. It lies at the border of Argentina and Chile and is very important, since the Copahue and Caviahue towns are very close and constitute important touristic resources including a ski center. The aim of this work is to improve the temperature register of the volcano and contribute towards a better understanding of the thermal behavior of the system during the quiescence period between the 2000 and 2012 eruptions. The surface temperature of the Crater Lake was estimated by using the Normalized Emissivity Method (NEM) on 70 images acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and we combined them with field measurements in order to capture the fundamental variations of the system. The analysis allowed the identification of two different thermal periods: (i) January 2001-August 2003 and (ii) December 2004-November 2011, characterized by temperature ranges of 43-50 degrees C and 30-45 degrees C, respectively. Beyond these ranges, temperature anomalies or moments of high temperature variability occurred, which corresponded to surface expressions of volcanic activity. In August 2004, the lake froze almost completely, whereas in March 2012, peak temperatures were recorded. However, a significant drop in temperature prior to the eruption of December 22, 2012, was observed, which might constitute a characteristic feature of the system. Furthermore, the Crater Lake of Copahue volcano is classified as a lake of high activity. The observations and interpretations presented constitute a useful baseline and a significant contribution towards a better understanding of the functioning of the volcano, the mitigation of volcanic hazards and the identification of volcanic unrest. (C) 2019 Elsevier B.V. All rights reserved.
机译：主动火山口湖泊是复杂岩浆水热系统顶部的火山活性的表面表达。 Volcanic和Hydroothermal System Copahue是阿根廷最重要的活性系统之一。它位于阿根廷和智利的边界，非常重要，因为科纳苏和野集城镇非常接近，构成了包括滑雪中心在内的重要旅游资源。这项工作的目的是改善火山的温度寄存器，并有助于在2000和2012次爆发之间的静态期间更好地了解系统的热行为。通过使用先进的星载热排放和反射辐射计（烧烤器）获得的70个图像上的标准化发射率法（NEM）估算了火山口湖的表面温度，并将它们与现场测量结合起来以捕获基本变化系统。分析允许鉴定两种不同的热周期：（i）2001年1月至2003年1月至2003年8月 - 2011年12月，以43-50℃和30-45摄氏度的温度范围为特征。超出这些范围，高温变异性的温度异常或矩发生，其对应于火山活性的表面表达。 2004年8月，湖泊几乎完全冻结，而2012年3月，记录了峰值温度。然而，观察到2012年12月22日爆发前的温度显着下降，这可能构成了系统的特征。此外，切割湖的火山口湖被归类为高活动湖。提出的观察和解释构成了有用的基线和对更好地了解火山的运作的重要贡献，对火山危害的减轻以及火山骚乱的识别。 （c）2019 Elsevier B.v.保留所有权利。

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