Solano-Rojas Darío, Wdowinski Shimon, Cabral-Cano Enrique, Osmanoğlu Batuhan
Marine Geology and Geophysics, School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL, 33149-1098, USA.
Department of Earth and Environment, Institute of Environment, Florida International University, Miami, FL, 33199, USA.
Sci Rep. 2020 Sep 22;10(1):15460. doi: 10.1038/s41598-020-72293-z.
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.
在全球许多城市地区，土壤条件变化引起的地面位移对土木结构的稳定性构成威胁。在快速沉降地区，区域沉降（波长约为1000米）可能占主导地位，从而掩盖了局部尺度（波长约为10 - 100米）的其他信号。尽管如此，工程和建筑应用仍需要全面了解局部尺度信号，这些信号可能威胁建筑物和基础设施的稳定性。在此，我们提出一种基于带通滤波器的新技术，用于揭示干涉合成孔径雷达（InSAR）测量所检测到的被区域沉降掩盖的局部尺度信号。我们将该技术应用于根据在墨西哥城获取的21个高分辨率COSMO - SkyMed场景计算出的速度场，得到了长（> 478米）、中（42 - 478米）和短（< 42米）空间波长的分量。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，中波长速度有助于检索诸如沿着地铁4号线和B号线高架桥的隆起信号，以及潘蒂特兰车站人行天桥系统中的差异位移信号，还有圣卡塔琳娜山脉山麓发生地表断层处跨越尖锐岩土边界的信号。
