A one trillion tonne iceberg – one of the biggest ever recorded - has calved away from the Larsen C Ice Shelf in Antarctica. The calving occurred sometime between Monday 10th July and Wednesday 12th July 2017, when a 5,800 square km section of Larsen C finally broke away. The iceberg, which is likely to be named A68, weighs more than a trillion tonnes. Its volume is twice that of Lake Erie, one of the Great Lakes.
http://www.projectmidas.org/blog/calving/
Also at BBC, PBS, The Guardian, and The Verge.
Complete Calving Coverage:
Antarctic Larsen C Ice Shelf to Calve; Halley VI Research Station Plans Move
Antarctic Ice Rift Close to Calving, After Growing 17km in 6 Days
Delaware-Sized Iceberg Could Break Off of Antarctica at Any Moment
Larsen C Rift Branches as it Comes Within 5 km of Calving
(Score: 1) by khallow on Thursday July 13 2017, @01:13AM
When was it last not floating? My understanding is that while the ice of the shelf is relatively young (according to Wikipedia [wikipedia.org], about two centuries maximum age), the ice shelf itself has been floating for much longer than a couple of centuries and hence, has been around since before the industrial age.