Anyone who has worked in mining or agriculture for any length of time is familiar with subsidence and understands that careful natural resource management can minimize its effects. Subsidence is a downward vertical movement that happens due to the removal or displacement of subsurface earth materials. It can be caused by either natural processes or human activities. Generally, the topic has been limited to specific sites or areas, such as California’s San Joaquin Valley, but has not been a widely discussed public subject.
However, that may be changing. A recent study in Nature posits that subsidence is threatening inland urban areas and that there is a high likelihood of infrastructure damage. In 28 of the most populous US cities, it’s estimated that 20% of the urban area is sinking and that more than 29,000 buildings are located in high damage risk areas.
More importantly, I believe there is an increasing narrative that subsidence accelerates the impacts of climate change and that will affect local communities whether they are coastal or inland.
While low-lying and waterfront neighborhoods may be the most vocal, it is my view that subsidence (in tandem with climate change) is going to move up the ladder of issues that will be raised whenever a regulation, inspection, or permit is under consideration. It bears watching.