Ground displacements due to changes in soil conditions represent a threat to the stability of civil structures in many urban areas, worldwide. In fast-subsiding areas, regional subsidence (wavelength ~ 1,000’s m) can be dominantly high and, consequently, mask other signals at local scales (wavelength ~ 10–100’s m). Still, engineering and construction applications require a comprehensive knowledge of local-scale signals, which can threaten the stability of buildings and infrastructure. Here we present a new technique based on band-pass filters for uncovering local-scale signals hidden by regional subsidence as detected by interferometric SAR measurements. We apply our technique to a velocity field calculated from 21 high-resolution COSMO-SkyMed scenes acquired over Mexico City and obtain components of long (> 478 m), intermediate (42–478 m) and short (< 42 m) spatial wavelengths. Our results reveal that long-wavelength velocities exceed − 400 mm/year, whereas intermediate- and short-wavelength velocities are in the order of ± 15 mm/year. We show that intermediate-wavelength velocities are useful for retrieving signals such as uplift along elevated viaducts of Metro lines 4 and B, as well as differential displacements in Pantitlán station’s pedestrian overpass system and across sharp geotechnical boundaries in the piedmont of Sierra de Santa Catarina—where surface faulting occurs.

由于土壤条件变化引起的地面位移对全球许多城市地区的土木结构稳定性构成威胁。在快速下沉地区，区域下沉（波长 ~ 1,000'sm）可能主要是高的，因此会掩盖局部尺度（波长 ~ 10-100's m）的其他信号。尽管如此，工程和建筑应用需要对局部尺度信号有全面的了解，这可能会威胁到建筑物和基础设施的稳定性。在这里，我们提出了一种基于带通滤波器的新技术，用于揭示由干涉 SAR 测量检测到的区域沉降隐藏的局部尺度信号。我们将我们的技术应用于从墨西哥城上空获得的 21 个高分辨率 COSMO-SkyMed 场景计算的速度场，并获得长 (> 478 m)、中 (42–478 m) 和短 (< 42 m) 空间波长。我们的结果表明，长波长速度超过 - 400 毫米/年，而中波长和短波长速度约为 ± 15 毫米/年。我们表明，中波长速度可用于检索信号，例如沿地铁 4 号线和 B 号线高架桥的隆起，以及 Pantitlán 站的行人天桥系统中的差异位移以及在 Sierra de Santa Catarina 山麓的陡峭岩土边界上的位移——发生表面断层的地方。