Series of earthquakes continues off Oregon coast

A series of earthquakes rattled the sea floor west of Oregon Monday along a crustal plate boundary.

SALEM (AP) — A series of earthquakes struck off the Oregon coast Monday but officials say no tsunamis were triggered.

The fifth and strongest of the quakes registered magnitude 5.9 at about 1:11 p.m. Monday. The first magnitude 5.8 earthquake struck at 12:52 a.m., followed a few minutes later by a 4.3 aftershock. A 5.5 hit at 4:46 a.m. Monday morning. A fourth smaller quake measuring magnitude 4.4 hit at 7:46 a.m.

Paul Caruso with the U.S. Geological Survey says the quakes hit a fault west of the Oregon and Washington coast. They were about 288 miles from Coos Bay, Oregon.

Caruso says they were 6 miles deep, which is relatively shallow. He says the deeper the quake, the less likely people will feel it. The magnitude 7.8 quake that recently struck Japan did little damage because it was 420 miles deep.

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

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