Magnitude 6.3 quake rumbles 150 miles off Oregon coast

(Update: Adding third, smaller quake)

COOS BAY, Ore. (AP) — An underwater earthquake with an initial 5.9 magnitude has struck off the southern Oregon coast, along with two smaller quakes before and after.

The U.S. Geological Survey said Thursday that no tsunami is expected from the quake, which happened about 180 miles from land at a depth of 7 miles (11 kilometers).

There were no reports of damage or injuries.

The larger quake happened around 8 a.m. in the same area where a 6.3-magnitude temblor struck on Aug. 29. The larger quake Thursday was preceded by one with a 3.7 magnitude. A 4.0 magnitude quake followed the larger one.

The earthquakes off the coast of Coos Bay are being caused by slipping along an offshore fault that has nothing to do with the more well-known Cascadia fault, which is believed to be overdue for a major Pacific Northwest earthquake.