7.7 magnitude quake hits off Russia, tsunami threat: US scientists

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The largest event was magnitude 7.8 earthquake that occurred December 17, 1929.

A powerful quake of magnitude 7.4 struck in the northern Pacific Ocean between the tip of Alaska's Aleutian Islands and Russia's Kamchatka Peninsula, the U.S. Geological Survey said on Monday.

The quake was followed by several aftershocks, including a couple above magnitude 5.0.

On Twitter, the center confirmed that it was not expecting tsunami conditions to impact North American coasts.

However, the tsunami threat has now passed, and the previously issued tsunami advisory for the Aleutian Islands is no longer in effect.

"There is no threat for the settlement", he specified.

The quake was initially reported as a magnitude 7.7 before being revised down to 7.4 and finally upgraded to 7.8, a major quake normally capable of causing widespread and heavy damage when striking on or near land. We'll add more detail to it shortly.

This is currently the second strongest earthquake of 2017.