Updates to the National Seismic Hazard Model have elevated the average ground shaking hazard across the country.
Some 230 million people in the United States face the potential of damaging earthquakes in 100 years, according to the latest U.S. National Seismic Hazard Model, or NSHM. That’s about 40 million more people than the NHSM previously suggested.
The NSHM draws from data on some 130,000 quakes recorded in seismic catalogs and the geologic record, as well as nearly 500 new active faults. It also incorporates new ground motion models that estimate the shaking at a site during a quake. These updates contributed to anDamaging quakes One key difference in this update is the improved characterization of shaking in sedimentary basins, Petersen says. Basins with deep soil can amplify some of the waves generated by an earthquake. That boost can be significant for a quake’s longer and slower waves, causing more damage to tall buildings and long bridges. Accounting for the amplification elevated the ground shaking hazard for such structures in some major cities, like Seattle, Los Angeles, Salt Lake City and Portland, Ore.
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