10:45 a.m. UPDATE: No tsunamis after five earthquakes off Oregon coast

8:45 a.m. UPDATE: A fourth earthquake hit in the same area as three earlier quakes Monday morning, according to the U.S. Geological Survey. The magnitude 4.4 earthquake struck off the Oregon coast at 7:46 a.m.

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SALEM -- Three earthquakes -- two large and one smaller -- struck off the coast of Oregon on Monday but officials say no tsunamis were triggered.

A magnitude 5.8 earthquake struck at 12:52 a.m. and a second quake measuring magnitude 5.5 hit at 4:46 a.m. Monday morning. A third smaller earthquake -- magnitude 4.3 -- struck at 1:07 a.m.

Paul Caruso, with the U.S. Geological Survey, says the quakes hit a fault that is west of the Oregon and Washington coast. They were about 330 miles west of Salem. (A USGS map offers more specifics on the three quakes).

Caruso says the two strongest earthquakes were each about 6 miles deep, which is relatively shallow.

He says the deeper the quake, the less likely people will feel it. For example, the magnitude 7.8 quake that recently struck Japan did little damage because it was 420 miles deep.

Caruso says the Oregon coast quakes were not big enough to trigger tsunamis. He says it usually takes a magnitude 7 for that to happen.

-- The Associated Press