Alaska earthquake: 7.3-magnitude quake strikes off Alaska, tsunami warning withdrawn

A 7.3-magnitude earthquake has struck off the coast of the US state of Alaska.

A 7.3-magnitude earthquake has struck off the coast of the US state of Alaska, triggering a tsunami warning that was later withdrawn, the US Geological Survey said.

The earthquake happened at 12.37pm (local time), with its epicentre about 87km south of the island town of Sand Point, the US Geological Survey (USGS) said. The epicentre had a relatively shallow depth of 20.1km.

Authorities initially issued a tsunami warning for South Alaska and the Alaska peninsula after the quake, but later downgraded it to a tsunami advisory, then withdrew it entirely.

“The Tsunami Advisory is cancelled for the coastal areas of South Alaska and the Alaska Peninsula,” said the National Tsunami Warning Centre (NTWC) in a message issued about two hours after the earthquake.

The initial quake was followed by a cluster of more than a dozen aftershocks, the largest of which was measured at 5.2 magnitude, according to the USGS.

The tsunami warning and advisory had only been issued for areas along the Alaskan coast, with areas further afield unaffected, the NTWC said.

A tsunami with a maximum height of 6.1cm was observed at Sand Point, it said.

Nevertheless, the centre advised residents in the affected zone to be aware of hazards.

“Do not reoccupy hazard zones until local emergency officials indicate it is safe to do so,” the NTWC said.

Alaska is situated along the seismically active Pacific Ring of Fire.

The remote US state was hit by a 9.2-magnitude earthquake in March 1964, the strongest recorded in North America.

It unleashed a tsunami that devastated the city of Anchorage and slammed the Gulf of Alaska, the US west coast, and Hawaii, killing scores and causing more than US$400 million ($673m) in property loss.

A 7.2-magnitude quake hit off the Alaska peninsula in July 2023, with no major damage reported.

– Agence France-Presse