Higher Geodesy Laboratory and Dionysos Satellite Observatory, School of Rural and Surveying Engineering, National Technical University of Athens, 9 Iroon Polytechniou str, Zographos 15780, Greece.
Institute for Astronomy, Astrophysics, Space Applications & Remote Sensing, National Observatory of Athens, Vas. Pavlou & I. Metaxa str, Penteli 15236, Greece.
Sensors (Basel). 2020 Jan 7;20(2):338. doi: 10.3390/s20020338.
Radar Interferometry is a widely used method for estimating ground deformation, as it provides precision to a few millimeters to centimeters, and at the same time, a wide spatial coverage of the study area. On July 9, 1956, one of the strongest earthquakes of the 20th century in the area of the South Aegean, occurred in Amorgos, with a magnitude of Mw = 7.7. The objective of this research is to map ground deformation in Amorgos island, using InSAR techniques. We conducted a multi-temporal analysis of all available data from 2003 to 2019 by exploiting historical ENVISAT SAR imagery, as well as the dense archive of Sentinel-1 SLC imagery. Persistent Scatterer Interferometry (PS) and Small Baseline Subset (SBAS) methods were implemented. Results of both data-sets indicate a small-scale deformation on the island. A multi-track analysis was implemented on Sentinel-1 data to decompose the line of sight velocities to vertical and horizontal. The central south coast is experiencing horizontal movement, while uplift of a maximum value of 5 mm/y is observed in the southeastern coast. The combination of the good spatial coverage achievable via InSAR, with GPS measurements, is suggested an important tool for the seamless monitoring of Amorgos island towards tectonic hazard estimation.
雷达干涉测量是一种广泛应用于估计地面变形的方法，因为它可以提供几毫米到几厘米的精度，同时还可以覆盖研究区域的大面积。1956 年 7 月 9 日，南爱琴海地区发生了 20 世纪以来最强的地震之一，震中位于阿莫尔戈斯岛，震级为 Mw=7.7。本研究的目的是利用干涉合成孔径雷达（InSAR）技术对阿莫尔戈斯岛的地面变形进行制图。我们通过利用历史上的 ENVISAT SAR 图像以及密集的 Sentinel-1 SLC 图像存档，对 2003 年至 2019 年所有可用数据进行了多时相分析。我们实施了永久散射体干涉测量（PS）和小基线子集（SBAS）方法。两个数据集的结果都表明该岛存在小规模的变形。我们对 Sentinel-1 数据进行了多轨迹分析，将视线速度分解为垂直和水平方向。该岛的中南部海岸正在经历水平运动，而东南海岸的隆起速度最大可达 5 毫米/年。InSAR 与 GPS 测量相结合，具有良好的空间覆盖范围，是对阿莫尔戈斯岛进行无缝监测、进行构造危险估计的重要工具。
