Today in Earthquake History

Earthquake History for October 28th

  •  M6.9 - Idaho, 1983

    The largest historical earthquake in Idaho.
    Two people killed, two injured, and considerable damage at Challis. One person injured and extensive damage at Mackay. Maximum intensity VII in the Challis-Mackay area. Total damage from the earthquake estimated at 15 million dollars. System of fault scarps extending for more than 35 kilometers with vertical displacement up to 2.7 meters observed between Mackay and Challis. Landslides, rockfalls and groundwater changes occurred throughout the region, including changes to geyser activity in Yellowstone National Park. The earthquake was felt in Idaho, Washington, Montana, Oregon, Nevada, Wyoming, Utah, and parts of Canada.

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