A widening chasm in Antarctica‘s Brunt Ice Shelf, which forced Britain’s Halley Research Station to be moved to safety several years ago, has finally split in two and birthed a huge iceberg more than 20 miles (30 kilometers) across.
The British Antarctic Survey (BAS) reported on Monday (Jan. 23) that the giant iceberg had “calved” from the floating ice shelf on Sunday (Jan. 22), between about 2 p.m. and 3 p.m. EST (1900 GMT and 2000 GMT), during an exceptionally high tide at sea — known as a spring tide — when the moon and sun are opposite each other.
The BAS said that the massive cleft known as Chasm-1, which its scientists have been monitoring for a decade, had finally broken the 490-foot-thick (150 meter) ice shelf in two — thereby creating a massive iceberg, roughly 600 square miles (1,550 square kilometers) in area, or larger than Los Angeles.
BAS scientists will now monitor the new iceberg; it’s expected to float west into Antarctica’s Weddell Sea.
This is the second major iceberg to break off from the Brunt Ice Shelf in two years, but scientists think both events are the result of natural processes, and not anthropogenic climate change.
The first iceberg, designated A-74, was about 20 times the size of Manhattan when it calved in February 2021, and has since floated into the Weddell Sea.
The new iceberg is slightly larger, but hasn’t been named yet.
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