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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Frequency based satellite monitoring of small scale explosive activity at remote North Pacific volcanoes
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Frequency based satellite monitoring of small scale explosive activity at remote North Pacific volcanoes

机译：基于频率的卫星监测在北太平洋偏远火山的小规模爆炸活动

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Monitoring of volcanoes in the North Pacific can be an expensive and sometimes dangerous task, specifically for those located in Alaska (USA) and Kamchatka (Russia). An active frequency detection method previously used at Stromboli, Italy, uses the thermal- and mid-infrared wavelength bands from the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data to detect anomalies at a volcano. This method focuses on small scale explosive activity, often referred to as Strombolian activity which can produce small spatter fields near a volcano's active vent In the North Pacific, there are a number of volcanoes which exhibit small scale explosive activity and three are the focus of this study: Chuginadak (Mt. Cleveland) and Shishaldin in Alaska, and Karymsky Volcano in Kamchatka. Satellite images from the Advanced Very High Resolution Radiometer (AVHRR) were used to monitor the frequency of thermal features as well as the occurrence of ash plumes at each volcano. This data was then used to produce a time series spanning 2005-2010 for all three volcanoes. During this time period, each volcano underwent a series of eruptive cycles including background levels of activity, heightened frequency of small explosions (identified as precursory activity), and heightened activity typified by ash plume-producing eruptions. Each location has a unique precursory signal, both in timing and magnitude. The use of a previously developed method on a new sample set of volcanoes has proved the validity of this method as a monitoring tool for volcanoes with small scale explosive activity. This method should be applied to a larger set of volcanoes to continue the development and database production for its use as a volcano monitoring tool.
机译：监视北太平洋的火山可能是一项昂贵且有时是危险的任务，特别是对于位于阿拉斯加（美国）和堪察加半岛（俄罗斯）的火山而言。以前在意大利的斯特龙博利（Stromboli）使用的一种有源频率检测方法，是使用中分辨率成像光谱仪（MODIS）卫星数据中的红外波段和中红外波段检测火山中的异常情况。此方法着重于小规模的爆炸活动，通常被称为斯特龙爆发活动，可以在火山的活动喷口附近产生小的飞溅场。在北太平洋，有许多火山具有小规模的爆炸活动，而其中三项是重点研究：阿拉斯加的Chuginadak（克利夫兰山）和Shishaldin，堪察加的Karymsky火山。来自超高分辨率高分辨率辐射计（AVHRR）的卫星图像被用于监视热特征的频率以及每个火山的烟羽的出现。然后，该数据用于生成所有三座火山的2005-2010年时间序列。在此期间，每个火山都经历了一系列喷发循环，包括本底活动水平，小爆炸的频率增加（标识为前兆活动）以及以产生烟灰羽状喷发为特征的活动增加。每个位置在时间和幅度上都有一个独特的前驱信号。在新的火山样本集上使用先前开发的方法证明了该方法作为具有小规模爆炸活动的火山监测工具的有效性。该方法应应用于更多的火山，以继续开发和数据库生产，以用作火山监测工具。

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