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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >The 2006 lava dome eruption of Merapi Volcano (Indonesia): Detailed analysis using MODIS TIR
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The 2006 lava dome eruption of Merapi Volcano (Indonesia): Detailed analysis using MODIS TIR

机译：2006年印度尼西亚默拉皮火山的熔岩穹顶喷发：使用MODIS TIR的详细分析

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摘要

Merapi is one of Indonesia's most active and dangerous volcanoes. Prior to the 2010 VEI 4 eruption, activity at Merapi during the 20th century was characterized by the growth and collapse of a series of lava domes. Periods of very slow growth were punctuated by short episodes of increased eruption rates characterized by dome collapse-generated pyroclastic density currents (PDCs). An eruptive event of this type occurred in May-June, 2006. For effusive eruptions such as this, detailed extrusion rate records are important for understanding the processes driving the eruption and the hazards presented by the eruption. We use thermal infrared (TIR) images from the Moderate Resolution Imaging Spectrometer (MODIS) instrument on NASA's Aqua and Terra satellites to estimate extrusion rates at Merapi Volcano during the 2006 eruption using the method of Harris and Ripepe (2007). We compile a set of 75 nighttime MODIS images of the eruptive period to produce a detailed time series of thermal radiance and extrusion rate that reveal multiple phases of the 2006 eruption. These data closely correspond to the published ground-based observational record and improve observation density and detail during the eruption sequence. Furthermore, additional analysis of radiance values for thermal anomalies in Band 21 (lambda = 3.959 mu m) of MODIS images results in a new framework for detecting different styles of activity. We successfully discriminate among slow dome growth, rapid dome growth, and PDC-producing dome collapse. We also demonstrate a positive correlation between PDC frequency and extrusion rate, and provide evidence that extrusion rate can increase in response to external events such as dome collapses or tectonic earthquakes. This study represents a new method of documenting volcanic activity that can be applied to other similar volcanic systems. (C) 2015 Elsevier B.V. All rights reserved.
机译：默拉皮（Merapi）是印度尼西亚最活跃和危险的火山之一。在2010年VEI 4爆发之前，20世纪默拉皮火山的活动以一系列熔岩穹顶的生长和坍塌为特征。生长非常缓慢的时期被喷发率增加的短暂发作所打断，喷发速率的特征是圆顶塌陷产生的火山碎屑密度电流（PDC）。这种类型的喷发事件发生在2006年5月至6月。对于这种喷发性喷发，详细的挤出速率记录对于理解驱动喷发的过程和喷发所带来的危害非常重要。我们使用美国国家航空航天局（NASA）的Aqua和Terra卫星上的中等分辨率成像光谱仪（MODIS）仪器提供的热红外（TIR）图像，使用哈里斯和里珀（2007）的方法估算2006年喷发期间默拉皮火山的挤压速率。我们汇编了一组75张夜间喷发期的MODIS图像，以产生详细的时间序列的热辐射和挤压速率，揭示了2006年喷发的多个阶段。这些数据与已发布的地面观测记录紧密对应，并在喷发过程中提高了观测密度和细节。此外，对MODIS图像的波段21（λ= 3.959微米）中的热异常的辐射值进行附加分析，得出了一种用于检测不同类型活动的新框架。我们成功地区分了缓慢的球顶增长，快速的球顶增长和生产PDC的球顶倒塌。我们还展示了PDC频率与挤压速率之间的正相关关系，并提供了证据表明挤压速率可以响应诸如穹顶坍塌或构造地震之类的外部事件而增加。这项研究代表了一种记录火山活动的新方法，该方法可以应用于其他类似的火山系统。 （C）2015 Elsevier B.V.保留所有权利。

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