According to the US National Tsunami Warning Center, the quake occured 175 miles (281.6 km) southeast of Kodiak City in Alaska at a depth of 12 miles (19.3 km), sparking the alert.
A tsunami watch is also in effect for the U.S. West Coast, as far south as California.
The Pacific Tsunami Warning Center said that based on all available data, the temblor may generate tsunami waves that could pose a threat to the islands.
The earliest a tsunami wave would hit Hawaii would be 4.26am local time.
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A tsunami warning has been issued in Alaska after a magnitude 8.0 natural disaster struck the area.
People in coastal Alaska were warned to flee inland or to high ground.
Earlier today a 6.0-magnitude quake has struck off Java in Indonesia. People reported on social media that the quake was felt hundreds of miles away, in Anchorage. According to their estimates, any tsunami would take at least three hours to strike the lower 49 states.