A swarm that has now reached over 3,500 small earthquakesbegan last weekendoff the Oregon coast, but officials insist that they do notpose any tsunami threat, even though part of the affectedocean floor is similar to the area in the Indian Ocean areathat produced the magnitude 9 quake that caused lastDecember’s huge tsunami in southeast Asia. The small quakesoff the Oregon coast range from a magnitude of 2 to 4.
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