Alexandria, VA - After the Aug. 24, 2014, Napa Valley earthquake, movement continued along the principal fault to the north of the epicenter, according to a report released by the U.S. Geological Survey. Such "afterslip" is known from previous quakes, but this is the first time that strong afterslip has been observed in a populated residential community. While the majority of shaking on the main strand of the West Napa Fault Zone occurred in rural fields, approximately 20 homes were immediately affected. The fault runs under Napa's Browns Valley neighborhood and is expected to slip between 5 and 15 centimeters in the next three years, followed by reduced slip until 2024.
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The American Geosciences Institute is a nonprofit federation of 50 geoscientific and professional associations that represents more than 250,000 geologists, geophysicists and other earth scientists. Founded in 1948, AGI provides information services to geoscientists, serves as a voice of shared interests in the profession, plays a major role in strengthening geoscience education, and strives to increase public awareness of the vital role the geosciences play in society's use of resources, resiliency to natural hazards, and interaction with the environment.