Nearly half of U.S. population at risk from severe earthquake shaking, study finds

Washington D.C. – Nearly half of the United States population, approximately 159.2 million people, is now at risk from severe earthquake shaking, according to a new study by the U.S. Geological Survey (USGS). This figure marks a substantial rise from earlier assessments, underscoring a growing vulnerability across the nation.

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The latest assessment places approximately 47.3 million homes and building premises valued at US$25.6 trillion at potential risk.

The latest USGS hazard model reveals that the number of Americans exposed to strong, potentially damaging ground shaking has increased significantly. This heightened risk affects around 47.3 million homes and buildings valued at $25.6 trillion. Furthermore, the number of people exposed to shaking considered severe enough to damage structures has surged to about 234 million.

While California remains a well-known earthquake hotspot, the study indicates that the threat extends far beyond the West Coast. Areas like the New Madrid Seismic Zone in the central U.S. are reporting increased risk. Critically, densely populated regions with extensive bridge networks, including those around New York, Atlanta, and St. Louis, face unexpected risks of serious structural disruption.

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For the scale of strong shaking at a risk level of damage, the number of exposed U.S. residents has jumped to about 234 million people.

Researchers caution that damage to key transportation routes or bridges could sever connections between residential areas and hospitals, delay rescue efforts, and paralyze traffic for extended periods post-earthquake. Despite the alarming figures, the study clarifies that this does not indicate an increase in the frequency or suddenness of earthquakes. Instead, it reflects advancements in scientific modeling that reveal a greater number of people, homes, and critical infrastructure are exposed than previously estimated.

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Damage to routes or main bridges could cut off connections between residential areas and hospitals, delay rescue teams, and paralyze traffic for a long time after the shaking stops.