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The Cascadia subduction zone, stretching from Northern California to Vancouver Island, is infamous in the world of geoscience for its seismic potential. It hasn’t produced a “great earthquake ...

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Science & Environment Cascadia earthquake tsunami threat may not be quite as bad as we thought (but it’s still bad) By Jes Burns (OPB) July 3, 2025 6 a.m.

By 2100, there is a 30% chance of a large earthquake happening," Dura said. The Cascadia Subduction Zone earthquake Scientists have a clear picture of what will happen when the earthquake strikes.

A “great earthquake,” with a magnitude higher than 8.0, has not happened along the Cascadia subduction zone since January 26, 1700, when a magnitude 9 quake struck the region.

While a 9.0 magnitude earthquake and the tsunamis that follow would devastate parts of the region, it’s the lasting change to the land level itself the scientists considered in their work.

Be the first to comment. However, the study authors noted that an earthquake with a seismic magnitude over 8.0 has not occurred in the region since Jan. 26, 1700. “Cascadia is a unique place.