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Subject Seismic Risk in Eastern U.S. May Be Higher Than Previously Thought

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Original Message The surprise magnitude-5.8 earthquake that stuck central Virginia and rattled cities up and down the US East Coast last year was a record-breaker in more ways than one. Not only was it felt by more Americans than any previous tremor, it triggered landslides over a wider area than any other recorded quake anywhere in the world, scientists say. A detailed analysis of ground motions triggered by the event also indicates that Washington DC and other affected population centers could be at a higher risk of major ground movement than previously recognized.

read more: [link to www.scientificamerican.com]

The culprit behind the extensive shaking appears to be geologic structures within the Appalachian Mountains, whose gentle curves reflect the twisted remains of ancient continental collisions. The Appalachian bedrock seems to channel seismic energy parallel to the mountain's north-south orientation, according to several studies presented during the same GSA meeting session, while fractures, faults and other structures impede travel perpendicular to the range.

[link to www.ouramazingplanet.com]

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