Swarm of earthquakes in Alaska puzzles scientists
from The Associated Press via ABC News
A moderate earthquake shook northwest Alaska, the fifth temblor of the same magnitude since April in an area with otherwise little activity, seismologists said. Before the swarm that began April 18, the last known quake of similar size in the area was a magnitude-5.5 quake that occurred in 1981, earthquake center seismologist Natasha Ruppert said.
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