Alexandria, VA – Global seismic hazard maps exist to help societies and decision-makers anticipate and prepare for earthquakes. These maps are supposed to depict the maximum level of ground shaking likely to be produced by an earthquake in a given area. In the past decade, however, ground motions and death tolls in areas struck by earthquakes have far exceeded these maps' projections. Thus, scientists are calling into question the standard methods used to estimate seismic risk, and accepted assumptions and calculations have come under fire.
Seismologists use two measurements to predict the potential danger from earthquakes: Seismic hazard and seismic risk. Seismic hazard is the likelihood an earthquake will occur in a specific region over a specific period and that ground shaking will exceed a specific strength. Seismic risk takes into account the harm or losses expected to result from the seismic hazard. Although scientists have specific ways to identify seismic hazard and seismic risk worldwide, the standard methods of classification are matters of vigorous debate. How can we better prepare ourselves for massive earthquakes to prevent damage and loss of life? Read the story at http://www.earthmagazine.org/article/better-warnings-consequences-earthquakes-bringing-seismic-hazard-and-risk-assessments-policy.
All shook up and ready to read more? Check out great stories in the June issue of EARTH Magazine, available now at http://www.earthmagazine.org/. Fill in the Middle Permian fossil gaps; travel to northeastern Australia's Atherton Tablelands; and find out if our arsenic supply is at risk, all in this month's issue of EARTH.
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The American Geosciences Institute is a nonprofit federation of 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.