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4.1 magnitude earthquake hits Cascadia Subduction Zone west of Coos Bay

(MGN Online image)

COOS BAY, Ore. -- Another earthquake hit the Cascadia Subduction Zone Tuesday night.

The small magnitude 4.1 quake hit offshore, about 250 miles west of Coos Bay and less than 300 miles west of Corvallis.

The quake was about six miles deep.

The Cascadia Subduction Zone is expected to one day release a massive earthquake and a resulting tsunami.

A geology professor we spoke with says small quakes like this are not unusual in the region.

"It's just a reminder that we live on a restless planet and need to be prepared,” said Southwestern Oregon Community College professor Ron Metzger, “so that we know that at some point, whether it's next year or in 50 years, that the subduction zone will end up breaking, but it's something that isn't necessarily directly associated with a small earthquake offshore now."

Metzger says these smaller quakes hit numerous times each year.

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