GOLD BEACH, Oregon (CBS SF) -- An earthquake registering a preliminary magnitude of 4.2 struck off the coast Gold Beach, Oregon Friday at 9:58 a.m., according to the U.S. Geological Survey's automated seismograph alert network.
The quake struck at an estimated depth of just about 15 miles, below the earth's surface.
Deeper quakes are less noticeable while a shallow quake--in the 0 to 40 mile depth range--can feel much stronger than their actual reported magnitude. Quakes just below the earth's surface, in the 0 to 10 miles range, can cause even more damage at lower magnitudes.
COMPLETE QUAKE COVERAGE: CBS Earthquake Resource Center
Strong earthquakes with an epicenter off the coast can trigger tsunamis, depending on the size and type of the fault movement. The Pacific Tsunami Warning Center tracks earthquake data for the West Coast.
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