差分干涉合成孔径雷达(DInSAR)对2018年12月22日喀拉喀托火山喷发后形态的分析

M. Iqbal, Anjar Dwi, A. Denhi, Kristianto, A. Prayoga
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引用次数: 0

摘要

喀拉喀托火山是一座活火山,位于印度尼西亚巽他海峡喀拉喀托火山群。2018年12月22日,该火山经历了一次大喷发,引发海啸,摧毁了爪哇岛和苏门答腊岛的海岸,造成多达437人死亡。火山的喷发还破坏了火山体,剧烈地改变了它的形状,在西南部形成了一个巨大的火山口。在那次喷发之后,火山继续长大。本文采用差分干涉SAR (differential interferometry SAR, DInSAR)方法分析了喀拉喀托火山2018年喷发后的变形情况。为了支持分析,我们还将DInSAR结果与构造-火山活动进行了比较。2019年6月5日至2020年1月7日哨兵1-A型SLC卫星图像数据;由19幅图像或18对图像作为主从组成变形图。DInSAR结果显示,火山在此期间普遍经历了通货紧缩,范围从-1.03到-4.81厘米(平均-3.01厘米)。然而,膨胀也发生在0至5.99厘米之间,与浅层和深层火山活动相关,随后在2019年10月爆发,当时观测到的火山活动最高。此外,在进行DInSAR处理时,应该高度考虑相干性值,本研究允许相干性是可接受的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Morphological Analysis of Anak Krakatau Volcano after 22 December 2018 Eruption using Differential Interferometry Synthetic Aperture Radar (DInSAR)
Anak Krakatau Volcano is an active volcano located in the Krakatau Complex, Sunda Strait, Indonesia. On 22 December 2018, the volcano experienced a major eruption that led to a tsunami that devastated the shores of the islands of Java and Sumatra and killed up to 437 people. The eruption also destroyed the volcano’s body and change its shape drastically and forming a large crater in the southwestern part. After that eruption, the volcano continues to grow up. This research aims to analyze the deformation of the Anak Krakatau Volcano post-2018 eruption by using the differential interferometry SAR method (DInSAR). In order to support the analysis, we additionally compare the DInSAR result with tectonic-volcanic activity. Sentinel 1-A type SLC satellite imagery data from 5 June 2019 to 7 January 2020; consisting of 19 images or 18 pairs as master and slave were used to producing a deformation map. DInSAR result shows the volcano was generally experiencing deflation during the period, ranging from -1.03 to -4.81 cm (-3.01 cm average). However, inflation also occurred ranging from 0 to 5.99 cm, correlating with shallow and deep volcanic activity and followed by eruptions in October 2019 when the highest activities were observed. Furthermore, coherence value should be highly considered along with DInSAR processing, and this research allows that coherence to be acceptable.
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