PASADENA, Calif. — Earthquakes threaten roughly half the U.S. population, a new study finds.
More than 143 million Americans live in earthquake-prone regions in the Lower 48 states, according to research presented here Wednesday (April 22) at the annual meeting of the Seismological Society of America. If you include Alaska, Hawaii and Puerto Rico, that number rises to about 150 million U.S. citizens, said lead researcher Kishor Jaiswal, a U.S. Geological Survey (USGS) contractor.
In a previous estimate prepared in 1991, officials with the Federal Emergency Management Agency (FEMA) said 75 million people in 35 states were at risk of
earthquakes.
Now, more people are living in quake-prone areas than a quarter-century ago, Jaiswal said. The USGS has also learned more about earthquake hazards. The nation's most recent national seismic hazard maps are much more detailed than the 1996 version, Jaiswal said.
As many as 28 million people in the 48 contiguous states could feel strong shaking in their lifetimes, he added. The Modified Mercalli Intensity Scale defines "strong shaking" as being frightening to many people, with some heavy furniture moved across the floor and a few instances of fallen plaster.
Jaiswal and colleagues from the USGS, FEMA and the California Geological Survey analyzed the nation's earthquake risks by combining the 2014 National Seismic Hazard Maps with LandScan, a global population database. The 2014 map only covers the 48 contiguous states; Alaska, Hawaii and Puerto Rico will be updated in coming years.
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