Cascadia Subduction Zone, Earthquake Swarm Near Medford Oregon, and Eugene

Cascadia Subduction Zone, Earthquake Swarm Near Medford Oregon, and Eugene

Sir Mark Frederick McKinney

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The last known megathrust earthquake in the northwest was in January, 1700, just over 300 years ago. Geological evidence indicates that such great earthquakes have occurred at least seven times in the last 3,500 years, a return interval of 400 to 600 years. To learn more about the history of the Cascadia Subduction Zone and the science that led to the discovery of it, delve into land level changes and turbidites created by the CSZ earthquakes. For more about the Cascadia Subduction Zone, visit the USGS webpage discussing this topic.

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