7.0-Magnitude Earthquake Strikes Mid-Atlantic Ridge
(CBS SF) — The U.S. Geological Survey says a strong earthquake struck in the middle of the Atlantic Ocean Wednesday morning, but a tsunami is not expected.
The 7.0-magnitude quake, originally reported as a 6.1, struck at 5:51 a.m. with its epicenter about 308 miles northwest of Edinburgh of the Seven Seas, Saint Helena and 1708 miles southeast of Arraial do Cabo, Brazil.
The quake struck at a depth of 6 miles near the Tristan Da Cunha Fracture Zone.
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.
There is no tsunami danger for the U.S., Canada, U.S. Virgin Islands and the British Virgin Islands, according to NOAA.
No damage or injuries were immediately reported.
COMPLETE QUAKE COVERAGE: CBS Earthquake Resource Center
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DID YOU FEEL IT?: USGS Shake Map For Northern California
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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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