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首页> 外文期刊>Pure and Applied Geophysics >Time Evolution of Deformation Using Time Series of Differential Interferograms: Application to La Palma Island (Canary Islands)
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Time Evolution of Deformation Using Time Series of Differential Interferograms: Application to La Palma Island (Canary Islands)

机译：使用微分干涉图的时间序列进行变形的时间演化：在拉帕尔玛岛（加那利群岛）上的应用

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Differential interferometry is a very powerful tool for detecting changes in the Earth’s crust where coherence conditions are good, but is difficult to employ in some volcanic areas due to dense vegetation. We apply two differential InSAR methods using the time series associated with the interferograms to perform a phase analysis on a data set for La Palma island (Canary Islands) from the ERS-1 and ERS-2 European Space Agency (ESA) satellites for the time period 1992 to 2000. Both methods involve choosing a master image from the database and creating a series of interferograms with respect to this image. The “Coherent Pixel Time Series” (CPTS) technique chooses pixels with good average coherence, aligns the unwrapped interferograms with a stable area and then performs an inversion to calculate the linear velocity to quantify the deformation. The Coherent Target Modeling (CTM) method calculates the temporal coherence of each pixel to identify stable targets and then determines the best velocity for each pixel by using a linear fit that maximizes the temporal coherence. Using these two methods we have been able to detect deformation on La Palma Island that has been previously undetectable by conventional InSAR methods. There is a roughly circular region on the Southern part of the island that is actively deforming at ~ −4 to −8 mm/yr. This region is located near the Teneguia valcano, the host of the last known eruption on La Palma in 1971. A thorough investigation of the possible sources for this deformation revealed that it was most likely created by a subsurface thermal source.
机译：差分干涉测量法是检测相干条件良好的地壳变化的强大工具，但由于植被茂密，在某些火山区很难使用。我们使用两种与干涉图相关的时间序列的差分InSAR方法，对欧洲航天局（ERS-1）和ERS-2欧洲航天局（ESA）卫星拉帕尔玛岛（加那利群岛）的数据集进行相位分析这两种方法都需要在1992年到2000年之间进行。这两种方法都涉及从数据库中选择主图像，并针对该图像创建一系列干涉图。 “相干像素时间序列”（CPTS）技术选择具有良好平均相干性的像素，将展开的干涉图与稳定的区域对齐，然后执行反演以计算线速度以量化变形。相干目标建模（CTM）方法计算每个像素的时间相干性以识别稳定的目标，然后通过使用使时间相干性最大化的线性拟合为每个像素确定最佳速度。使用这两种方法，我们已经能够检测到拉帕尔玛岛上的变形，而这以前是传统InSAR方法无法检测到的。岛的南部有一个大致呈圆形的区域，以约-4至-8 mm / yr的速度活跃变形。该区域位于Teneguia火山附近，Tenneguia火山是1971年拉帕尔马岛上最后一次已知的火山爆发的发源地。对这种变形的可能来源进行的彻底调查显示，该变形很可能是由地下热源造成的。

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