The earthquake struck near the Rat Islands
The earthquake struck near the Rat Islands archipelago at around 8:40am on Wednesday Hawaii-Aleutian Standard Time (HAST). The epicenter was about 324 km (201 miles) west of Adak, Alaska. The tremor occurred at a depth of about 83 km (51 miles)
A massive earthquake with a magnitude of 6.3 struck offshore near Alaska's Amchitka Island and officials have warned aftershocks are likely.

The earthquake struck near the Rat Islands archipelago around 1:40pm (EST) Eastern Standard Time.

The epicenter was about 324 km (201 miles) west of Adak, Alaska and the tremor was recorded at a depth of about 83 km (51 miles).

Moderate to strong shaking was felt near the epicenter while lighter shaking was felt elsewhere in the Rat Islands, according to Crisis 24.

Officials said aftershocks are likely to follow and it could take several hours until authorities can check for damage, especially in the more remote areas.

There were no immediate reports of any casualties and there were no threats of a tsunami.

Officials said the transportation infrastructure in the tremor zone may be temporarily shut down in order for them to assess the damage.

Some utility outages where shaking occurred may also be expected.

An earthquake with a preliminary magnitude of 6.9 struck off the coast of Alaska on October 11, 2021, two months after America's biggest earthquake in 50 years struck the same region.

The epicenter was about 71 miles (114 kilometers) east of the city of Chinik, the U.S. Geological Survey reported. The depth was reported at 29 miles (46.3 km) deep.

The tremor was confirmed by the Alaska Earthquake Center as an aftershock of the 8.2 earthquake, which struck on July 28 and was the strongest felt in the US since an 8.7 quake ripped through the western Aleutian Islands in 1965.

According to the US Geological Survey's Earthquake Hazards Program, aftershocks can continue over a period of weeks, months, or years.

The earthquake was felt by residents along the Alaska Peninsula and Kodiak Island but there was no tsunami threat, according to the U.S. Tsunami Warning Center

While Monday's tremor hit 71 miles east of Chignik, the July earthquake hit 56 miles southeast of the town of Perryville, meaning the quakes were around 38 miles apart.

Alaska's Amchitka Island is an uninhabited island is located in the Rat Island group in the Aleutian Islands, located more than 1,300 miles west-southwest of Anchorage.

The island chain is bound by the Bering Sea to the north and east and the Pacific Ocean to the south and west.

The site, was used as an airfield by US forces in the Aleutian Islands Campaign, during World War II, and has been part of the United States since the Alaska Purchase of 1867.

The island was once occupied by the Aleut people approximately 2,500 years ago, and today is part of the Alaska Maritime National Wildlife Refuge and access is restricted.

The mountainous area is surrounded by a rugged coastline, isolated ponds, rolling hills, and is known to be a volcanic region.

The maritime climate, dominated by overcast skies and and frequent storms.

In May, a team of experts sent to Alaska by the U.S. Department of Energy Office of Legacy Management traveled to the island to conduct maintenance and repair work.

During the late 1960s and 1970s, the US government conducted three underground nuclear tests on the island, officials said.