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首页> 外文期刊>Pure and Applied Geophysics >A Quantitative Assessment of DInSAR Measurements of Interseismic Deformation: The Southern San Andreas Fault Case Study
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A Quantitative Assessment of DInSAR Measurements of Interseismic Deformation: The Southern San Andreas Fault Case Study

机译：DInSAR地震间形变测量的定量评估：南部圣安德烈亚斯断层案例研究

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摘要

We investigate the capabilities and limitations of the Differential Interferometric Synthetic Aperture Radar (DInSAR) techniques, in particular of the Small BAseline Subset (SBAS) approach, to measure surface deformation in active seismogenetic areas. The DInSAR analysis of low-amplitude, long-wavelength deformation, such as that due to interseismic strain accumulation, is limited by intrinsic trade-offs between deformation signals and orbital uncertainties of SAR platforms in their contributions to the interferometric phases, the latter being typically well approximated by phase ramps. Such trade-offs can be substantially reduced by employing auxiliary measurements of the long-wavelength velocity field. We use continuous Global Positioning System (GPS) measurements from a properly distributed set of stations to perform a pre-filtering operation of the available DInSAR interferograms. In particular, the GPS measurements are used to estimate the secular velocity signal, approximated by a spatial ramp within the azimuth-range radar imaging plane; the phase ramps derived from the GPS data are then subtracted from the available set of DInSAR interferograms. This pre-filtering step allows us to compensate for the major component of the long-wavelength range change that, within the SBAS procedure, might be wrongly interpreted and filtered out as orbital phase ramps. With this correction, the final results are obtained by simply adding the pre-filtered long-wavelength deformation signal to the SBAS retrieved time series. The proposed approach has been applied to a set of ERS-1/2 SAR data acquired during the 1992-2006 time interval over a 200 × 200 km area around the Coachella Valley section of the San Andreas Fault in Southern California, USA. We present results of the comparison between the SBAS and the Line Of Sight (LOS)-projected GPS time series of the USGC/PBO network, as well as the mean LOS velocity fields derived using SBAS, GPS and stacking techniques. Our analysis demonstrates the effectiveness of the presented approach and provides a quantitative assessment of the accuracy of DInSAR measurements of interseismic deformation in a tectonically active area.
机译：我们研究了差分干涉合成孔径雷达（DInSAR）技术，特别是小型BAseline子集（SBAS）方法的功能和局限性，以测量活跃地震发生区的表面变形。低振幅，长波形变的DInSAR分析（例如因地震应变累积引起的分析）受到形变信号与SAR平台轨道不确定性在其对干涉相位的贡献之间的内在权衡的限制，后者通常是干涉相相位斜坡可以很好地近似。通过采用对长波长速度场的辅助测量，可以大大减少这种折衷。我们使用来自一组适当分布的站点的连续全球定位系统（GPS）测量，对可用的DInSAR干涉图执行预过滤操作。尤其是，GPS测量用于估计长期速度信号，该速度由方位角范围雷达成像平面内的空间坡度近似;然后从可用的DInSAR干涉图中减去从GPS数据得出的相位斜坡。这个预滤波步骤使我们能够补偿在SBAS程序中可能会误解并滤除为轨道相位斜坡的长波长范围变化的主要成分。通过此校正，只需将预滤波的长波长变形信号添加到SBAS检索的时间序列中，即可获得最终结果。所提出的方法已应用于在美国南部加利福尼亚州圣安德烈亚斯断层的科切拉谷地段周围200×200 km区域内1992-2006年时间间隔内获取的ERS-1 / 2 SAR数据集。我们介绍了SBAS与USGC / PBO网络的视线（LOS）投影的GPS时间序列之间的比较结果，以及使用SBAS，GPS和叠加技术得出的平均LOS速度场。我们的分析证明了所提出的方法的有效性，并提供了对DInSAR构造活动区间地震形变测量精度的定量评估。

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