Sinking Cities: A Looming Threat to the US East Coast

The ground beneath our feet is not always as stable as we think. This is especially true for many cities along the US East Coast, which are sinking faster than previously thought. This phenomenon, known as subsidence, is posing a serious threat to buildings, roads, and other critical infrastructure.

A Problem Worse Than Sea Level Rise

Recent research published in the journal PNAS Nexus reveals that some areas in major cities like New York City, Long Island, Baltimore, Virginia Beach, and Norfolk are sinking by as much as 5 millimeters per year. This rate of subsidence is outpacing global sea level rise, which means that these cities are sinking even faster than the ocean is rising around them.

This is a major cause for concern because subsidence can have a number of negative consequences. It can damage buildings and roads, disrupt drainage systems, and increase the risk of flooding. In some cases, it can even lead to the complete collapse of infrastructure.

Hotspots of Sinking Land

The researchers who conducted the PNAS Nexus study identified several hotspots of sinking land along the US East Coast. These hotspots are often located in areas with a high concentration of population and infrastructure, which makes them particularly vulnerable to the impacts of subsidence.

One of the main causes of subsidence is the extraction of groundwater. When groundwater is pumped out of the ground, it can cause the land above to sink. This is a particular problem in coastal areas, where groundwater is often used for irrigation and other purposes.

Other factors that can contribute to subsidence include:

• Landfill weight: The weight of landfills can cause the ground beneath them to sink.
• Erosion: Erosion can cause the coastline to recede, which can destabilize the land and lead to subsidence.
• Seismic activity: Earthquakes and other seismic events can trigger subsidence.

What Can Be Done?

There are a number of things that can be done to mitigate the risks of subsidence. These include:

• Limiting groundwater extraction: This is the most important step that can be taken to reduce subsidence.
• Monitoring subsidence rates: By closely monitoring subsidence rates, we can identify areas that are at risk and take steps to protect them.
• Investing in infrastructure: We need to invest in infrastructure that is resistant to subsidence, such as seawalls and levees.
• Raising awareness: The public needs to be aware of the risks of subsidence so that they can take steps to protect their homes and businesses.

The problem of sinking cities is a complex one, but it is not insurmountable. By taking action to mitigate the risks of subsidence, we can protect our communities and ensure that they remain safe and livable for generations to come.

Call to Action

This is a critical issue that needs to be addressed immediately. We urge policymakers and government officials to take action to mitigate the risks of subsidence and protect our coastal communities. We also encourage individuals to learn more about subsidence and take steps to protect their own homes and businesses.

Together, we can ensure that our cities stand strong in the face of this growing threat.