Key points
- The earthquake took place at approximately 12:37 local time (2037 GMT)
- Initial quake was followed by a cluster of more than a dozen aftershocks: USGS
- Alaska was hit by a 9.2-magnitude earthquake in March 1964
LOS ANGELES, United States: A 7.3-magnitude earthquake struck off the coast of the US state of Alaska on Wednesday, triggering a tsunami warning that was later withdrawn, the US Geological Survey said.
The earthquake took place at approximately 12:37 local time (2037 GMT), with its epicentre located about 54 miles (87 kilometres) south of the island town of Sand Point, USGS said. The epicentre had a relatively shallow depth of 12.5 miles, according to AFP.
Authorities initially issued a tsunami warning for South Alaska and the Alaska peninsula after the quake, but later downgraded it to a tsunami advisory, and then withdrew it entirely.
“Tsunami Advisory”
“The Tsunami Advisory is canceled for the coastal areas of South Alaska and the Alaska Peninsula,” said the National Tsunami Warning Center (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 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 0.2 feet (6.1 centimeters) was observed at Sand Point, it said.
Nevertheless, the center advised residents in the affected zone to be aware of hazards.
“Do not re-occupy hazard zones until local emergency officials indicate it is safe to do so,” the NTWC said.
AP reported that there were 40 aftershocks detected within the first three hours. It added that the highest water level generated by the earthquake in Sand Point was not quite 2.5 inches (6.3 cm) above the tide. AP cited Sand Point Police Chief Benjamin Allen as saying “There’s no damage at the airport, doesn’t appear to be any damage at the harbor, no damage to speak of, really,”.
Pacific Ring of Fire
AFP reported that 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 ever 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 $400 million in property loss.
A 7.2-magnitude quake hit off the Alaska peninsula in July 2023, with no major damage reported following the tremor.
