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首页> 外文会议>Conference of PhD Students and Young Scientists Interdisciplinary Topics in Mining and Geology >Ground Surface Deformation Monitoring of an Active Volcano Using the DInSAR Technique in Comparison with GPS Data: Case Study of Okmok Volcano, Alaska
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Ground Surface Deformation Monitoring of an Active Volcano Using the DInSAR Technique in Comparison with GPS Data: Case Study of Okmok Volcano, Alaska

机译：与GPS数据相比，使用DINSAR技术的活性火山的地表变形监测：Okmok Volcano，阿拉斯加的案例研究

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Mount Okmok is an active volcano, located on the northeastern end of Umnak Island in the Aleutian Islands of Alaska. It is a shield volcano with an approximately 10 km wide caldera, and has undergone several eruptions over the last decades, with the most recent one taking place in 2008. Presence of an underground magma reservoir is manifesting on the surface in form of terrain deformations, e.g. subsidence and uplift. Because of that, Okmok is one of the most thoroughly studied volcanoes in the Aleutian Islands. Its deformations have been examined in the past using field geodetic techniques, like GPS. Work has also been done to determine Okmok's surface displacements using SAR Interferometry. The article presents an approach of calculating terrain deformations with the differential SAR interferometry method, as well as a quality assessment of obtained results by a comparison with GPS data received from various stations located over the study area. The DInSAR calculations have been conducted on a set of radar images taken by the Sentinel-1A and Sentinel-1B satellites from tracks 44, 95 and 117, covering a period of time between years 2015 and 2018. Calculated LOS deformations show that there is a significant uplift in the area of volcano's caldera, in contrast to the rest of Mount Okmok's surface. The comparison with GPS time series shows that both methods bring similar results, meaning that Sentinel-1 imagery processed with the DInSAR method can successfully be used to determine ground surface deformations over large areas.
机译：Mount Okmok是一座活跃的火山，位于阿拉斯加的阿雷迪亚群岛乌纳克岛东北部。它是一个盾牌火山，大约10公里的火山口，在过去几十年中经历了几个爆发，最近在2008年进行。地下岩浆水库的存在表现在地形变形形式的表面上，例如沉降和隆起。因此，Okmok是阿雷迪迪群岛最彻底研究的火山之一。过去使用现场大地测量技术（如GPS）在过去检查了其变形。还已经完成了使用SAR干涉测量法确定Okmok的表面位移。该物品提出了一种用差分SAR干涉测量方法计算地形变形的方法，以及通过与位于研究区域的各种电台接收的GPS数据的比较来实现结果的质量评估。已经在由轨道44,95和117的Sentinel-1a和Sentinel-1b卫星拍摄的一组雷达图像上进行了Dinsar计算，覆盖了2015年和2018年之间的一段时间。计算的LOS变形表明存在一个与火山的地表的其余部分相比，火山的火山口面积显着提升。与GPS时间序列的比较表明，两种方法都带来了类似的结果，这意味着用DINSAR方法处理的Sentinel-1图像可以成功地用于确定大面积的地面变形。

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