The tsunami threat is over, but according to the USGS, since 1900 there have been six other earthquakes of magnitude 7.0 and higher within 155 miles (250 km) of Tuesday’s quake. The largest of those was a 8.2 quake in 1938.
The United States Geological Survey says powerful 7.8 quake struck off Alaska's southwest coast; initially issuing tsunami warnings.
This quake hit the Alaska Peninsula on Tuesday at about 11:12 p.m. PST. It had a depth of 6 miles 9.6 kilometers and was centered 60 miles (96 kilometers) south-southeast of Perryville, Alaska.
The 7.8-magnitude earthquake slammed the Alaskan peninsula, according to USGS It occurred at a depth of 10 km 6 miles some 75 miles south of the city of Chignik early Wednesday morning.
The US National Tsunami Warning Center had issued tsunami warning for southern and coastal Alaska, and the Aleutian Islands.
A tsunami warning was for South Alaska, the Alaska Peninsula and the Aleutian Islands. The Pacific Tsunami Warning Center said the warning for South Alaska and the Alaska Peninsula is from Kennedy Entrance to Unimak. Along the Aleutian Islands it is from Unimak Pas to Samalga Pas.
Aftershock tremors between 3.9 and 5.7-magnitude have now been recorded in the area, reports the USGS. An earlier alert from the GFZ German Research Centre reported it as a 7.4-magnitude tremor, which was revised
