Moderate Earthquake Rattles Alaska Days After 6.9 Quake
YUNASKA ISLAND, Alaska (CBS SF) — The U.S. Geological Survey says a 5.4-magnitude earthquake struck in the central Aleutian Islands in Alaska Tuesday afternoon.
The shallow quake struck at 2:21 p.m. with its epicenter about 59 miles southeast of Yunaska Island, Alaska.
The quake struck at a depth of 6.2 miles.
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.
No damage or injuries were immediately reported.
A 6.9-magnitude earthquake Sunday night in the same region was definitely not strong enough to send a tsunami to the Bay Area, a tsunami program manager with the National Tsunami Warning Center said.
Tsunami program manager Cindi Preller said the threshold for the occurrence of a tsunami is a 7.0-magnitude earthquake, which might be enough to generate a tsunami near the quake's origin.
COMPLETE QUAKE COVERAGE: CBS Earthquake Resource Center
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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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