The earthquake, which was initially reported as a magnitude 7.5 on the Richter Scale, struck at a depth of 164.7km and was later downgraded to a magnitude 7.1.
Nearby affected places include the Argentine territory of Tierra del Fuego and mainland Chile.
The quake struck close to the British-owned Sandwich Islands, which are home to several active volcanoes.
Its epicentre was 61km northeast of Bristol Island, a small island comprising several active volcanoes.
The last known eruption on Bristol Island was in 2016.
The quake, which struck at 2.26am, was in a remote area and fairly deep underground, meaning aftershocks are less likely, according to Britannica.
No tsunami threat was issued by the US Pacific Tsunami Warning Center.
Bristol Island, close to where the earthquake hit, is an 8km-long island nestled midway between Montagu Island and Thule Island in the South Sandwich Islands close to South Georgia.
Bristol Island, a highly volcanic zone with regular eruptions occurring, is 2,082km (1,294 miles) southeast of the Falkland Islands.
The island’s notable features include Havfruen Peak, which is a huge 365m-high volcano.
Turmoil point in the island’s west is another imposing and distinctive landmark, rising to 400m and culminating in a snow-covered summit.
Bristol Island is close to the British overseas territory of South Georgia - a remote and inhospitable collection of islands.
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