Mexico City is built on a unique ground containing the clay-rich sediments of the ancient lake Texcoco. Continuous imperceptible shaking of these deposits by city traffic and other sources allows us to monitor changes in the subsurface seismic wave speed. Wave speed varies seasonally, likely due to temperature and rain effects; it temporarily drops after large earthquakes then starts to recover. Throughout the studied period, it increased on average, which may be related to soil compaction.

Over the past decade, several coastal communities in southeast Florida have experienced a significant increase in flooding frequency. In a recent project, funded by the state of Florida, we monitor coastal subsidence in southeast Florida using GPS and InSAR observations, in order to evaluate the contribution of local subsidence to the increased coastal flooding hazard.

Sinkhole activity in west-central Florida is a major hazard for people and property. In this work, we use radar interferometry acquired over a selected region in Hernando County in west-central Florida to observe small localized deformation possibly caused by sinkhole activity. Results reveal several areas of localized subsidence at rates ranging from −3.7 to −4.9 mm/yr.

Land subsidence in Mexico City results from a combination of groundwater resources' overexploitation and the local stratigraphic nature. A Sentinel-1 based subsidence analysis velocity map was used as the basis for a population density weighted land subsidence correlation analysis. Our Land Subsidence Risk assessment indicates that 15.43 % of the population of Mexico City live in intermediate, high and very-high risk zones which corresponds to 1 358 873 inhabitants.

Differential subsidence produces damage to infrastructure and geological media. However, detecting and mapping differential subsidence at a regional scale using satellite date becomes challenging when considering the large amount of displacement products that can be produced. Here we show some examples of our work with products at different scale and focused on different aspects of differential subsidence.