ABSTRACT The city of Morelia has been affected by Structurally-Controlled Differential Subsidence (SCDS) since at least 1983, modifying civil structures and infrastructure through the appearance of ground failures and differential ground subsidence. The resulting damage to streets, homes, hydraulic lines, and government facilities has caused economic losses worth millions of dollars. An increase in population has led to the overexploitation of groundwater, which is the main trigger for SCDS, while the subsoil's geology and bedrock configuration are considered conditioning factors of this phenomenon. This paper offers an analysis of the SCDS evolution over the last fourteen years and its relationship with groundwater extraction and thickness of unconsolidated sediments. The former was carried out through SAR Interferometry techniques to detect and monitor land subsidence, using Small Baseline Subset (SBAS) from 2003 to 2010 and Persistent Scatterer Interferometry (PSI) from 2014 to 2017. Additionally, groundwater pumping well data and lithological information from boreholes enabled a spatial analysis to evaluate the role of these factors in the development and acceleration of SCDS. The SBAS results show maximum sinking rates of 2.2 cm/yr. with a spatial distribution that is clearly controlled by buried geological structures. In this period, the maximum sinking rates were induced by high groundwater extraction rates in focused areas, while intermediate rates were linked to notable depletion cones. The PSI results indicate a maximum sinking rate of 2.74 cm/yr. and an accelerated subsidence migration to the west, owing to the construction of new wells and persistent high groundwater extraction rates. For both periods, the larger compressible sediment package reveals a good correlation with high subsidence rates, mainly in the hanging wall blocks of the buried faults. The identification of differential subsidence accompanied by high sinking rates in novel areas of Morelia, as well as the detection of the subsidence migration, will provide scientific support to decision-makers for the proposal of engineering solutions and urban planning capable of reducing hydrogeological hazards associated with SCDS.

中文翻译：

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使用 SBAS 和 PS 干涉测量法在墨西哥中部的一个典型案例中对结构控制的差异沉降进行演化评估

摘要 至少自 1983 年以来，莫雷利亚市一直受到结构控制差异沉降 (SCDS) 的影响，通过出现地面故障和差异地面沉降改变了土木结构和基础设施。由此对街道、房屋、液压管线和政府设施造成的破坏造成了价值数百万美元的经济损失。人口增加导致过度开采地下水，这是 SCDS 的主要触发因素，而底土的地质和基岩构造被认为是这种现象的调节因素。本文分析了过去 14 年的 SCDS 演化及其与地下水提取和松散沉积物厚度的关系。前者是通过 2003 年至 2010 年使用小基线子集 (SBAS) 和 2014 年至 2017 年使用持续散射干涉测量法 (PSI) 的 SAR 干涉测量技术来检测和监测地面沉降。此外，来自钻孔的地下水抽水井数据和岩性信息使空间分析能够评估这些因素在 SCDS 的发展和加速中的作用。SBAS 结果显示最大下沉率为 2.2 厘米/年。具有明显受埋藏地质结构控制的空间分布。在此期间，最大下沉率是由重点区域的高地下水抽取率引起的，而中间率与显着的枯竭锥相关。PSI 结果表明最大下沉率为 2.74 厘米/年。以及向西加速的沉降迁移，由于新井的建设和持续的高地下水开采率。对于这两个时期，较大的可压缩沉积物包显示出与高沉降速率的良好相关性，主要是在埋藏断层的上盘块中。在莫雷利亚新地区识别伴随高下沉率的差异沉降，以及对沉降迁移的检测，将为决策者提供科学支持，以提出能够减少与水文地质灾害相关的水文地质灾害的工程解决方案和城市规划。 SCDS。