Cluster of quakes shake off Oregon Coast

EUGENE, Ore. - A cluster of five quakes ranging in strength from 4.3 to 5.9 shook off the coast of Oregon on Monday.

The quakes did not generate tsunamis.

The rumbling happend in what is known as the Blanco Fracture Zone.

It's a fault similar to California's San Andreas, where two sides rub against each other.

But it's different from the Cascadia Subduction Zone, where one plate moves under another.

State geologist Ian Madin said quakes along the Blanco Fracture Zone are pretty common, but are a good reminder of the bigger picture.

"So everything that we've told people about the Cascadia Subduction Zone producing great big earthquakes, magnitude 9, some time in the next decades, remains true," Madin said. "And so this is just a reminder that this is a live subduction zone and it's on it's way to having a big earthquake."

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