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Landslides and Subsidence Assessment in the Crati Valley (Southern Italy) Using InSAR Data

机译：使用InSAR数据的Crati谷（意大利南部）的滑坡和塌陷评估

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In this work, we map surficial ground deformations that occurred during the years 2004–2010 in the Crati Valley (Southern Italy). The valley is in one of the most seismically active regions of the Italian peninsula, and presents slope instability and widespread landslide phenomena. We measured ground deformations by applying the small baseline subset (SBAS) technique, a multi-temporal synthetic aperture radar interferometry (InSAR) methodology that is used to process datasets of synthetic aperture radar (SAR) images. Ground displacements are only partially visible with the InSAR technique. Visibility depends on the geometry of the acquisition layout, such as the radar acquisition angle view, and the land use. These two factors determine the backscattering of the reflected signal. Most of the ground deformation detected by InSAR can be attributed to the gravitational mass movements of the hillslopes (i.e., landslides), and the subsidence of the quaternary deposits filling the valley. The movements observed along the valley slopes were compared with the available landslide catalog. We also identified another cause of movement in this area, i.e., ground subsidence due to the compaction of the quaternary deposits filling the valley. This compaction can be ascribed to various sources, such as urban population growth and sprawl, industrial water withdrawal, and tectonic activity.
机译：在这项工作中，我们绘制了2004-2010年间Crati山谷（意大利南部）发生的地面地面变形的地图。该山谷位于意大利半岛最活跃的地震区域之一，呈现出斜坡失稳和广泛的滑坡现象。我们通过应用小型基线子集（SBAS）技术（一种用于处理合成孔径雷达（SAR）图像数据集的多时间合成孔径雷达干涉测量（InSAR）方法）来测量地面变形。使用InSAR技术只能部分看到地面位移。可见性取决于采集布局的几何形状，例如雷达采集角度视图和土地用途。这两个因素决定了反射信号的反向散射。 InSAR探测到的大多数地面变形可归因于山坡的重力质量运动（即滑坡）以及填满山谷的第四纪沉积物的沉降。将沿山谷斜坡观察到的运动与可用的滑坡目录进行了比较。我们还确定了该区域运动的另一个原因，即由于填满山谷的第四纪沉积物的压实而引起的地面沉降。这种压实可归因于各种来源，例如城市人口的增长和蔓延，工业取水量以及构造活动。

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