Accelerated Sinking of U.S. East Coast Poses Increased Risk to Infrastructure and Population

A recent study published in the journal PNAS Nexus unveils alarming satellite imagery indicating that the Eastern coast of the United States is sinking more rapidly than previously reported, posing a significant threat to densely populated and infrastructurally vital areas.

The research, spearheaded by Virginia Tech’s Earth Observation and Innovation Lab, has painted a concerning picture, specifically for the New York City metropolitan area. Initial reports suggested the land was subsiding at a rate of 0.06 inches per year, but the latest findings have seen this number increase to an average sink rate of 0.08 inches. Some parts of the region are experiencing even more dramatic changes, descending at a rate that exceeds 0.2 inches annually.

According to Leonard Ohenhen, the lead author of the study and a graduate student at Virginia Tech, the gravity of the situation lies not only in the sinking land but also in its intersection with critical infrastructure hubs. JFK and LaGuardia airports, along with crucial railway systems in New York, are identified as hotspots sinking more than 2 millimeters per year. The implications of such land subsidence include heightened vulnerability to flooding and possible structural damage.

The study breaks new ground by providing detailed maps created from space-based radar satellite data, a first of their kind, showcasing the "vertical land motion rates" that assess the dangers of sinking landscapes for the population and infrastructural assets. With the Atlantic Coast's 74,000 square kilometers already losing ground, and pockets along the area shedding over 5 millimeters per year, the urgency for proactive measures has become apparent.

Ohenhen highlights that with the projected rise in sea levels, reaching 10 to 14 inches over the next 30 years, the East Coast is confronted with a seemingly inescapable predicament. Moreover, it's not only about the rising waters but also how the descending terrain can disrupt the region's topography, increasing the propensity for flooding during rainfalls and storm events.

Adapting to this phenomenon presents significant challenges. For instance, the uneven nature of the sinking makes solutions like raising levees less practical, as structures such as buildings and runways could experience distortion due to unequal settlement.

In addition to New York City, other regions are also spotlighted for their risk exposure. Virginia Beach, with over 450,000 people and 177,000 properties, and Baltimore, Maryland, where 826,000 residents and 335,000 properties are under threat, exemplify the widespread implications of this geological shift.

The study underscores the urgent need for a reconsideration of resilience strategies along the East Coast. As the geological survey's co-author Patrick Barnard suggests, such data is invaluable and necessary for planning and prevention in the face of tangible and escalating land subsidence impacts.