Two images captured by the Landsat 8 satellite on July 31 and August 16, 2015 of Greenland's Jakobshawn Glacier may have revealed the largest glacial calving event ever recorded. Glacial calving is when large chunks of ice break off of a glacier.
Other satellite images helped narrowed down the time frame as to when this calving event took place to between August 14 and 16, 2015. Those that say that this was the biggest glacial calving event ever recorded are doing so off of preliminary data. Scientists still need to determine whether it may have been several large calving events that caused this huge ice loss.
The rate of retreat for the Jakobshawn Glacier is accelerating. In summer 2012, the glacier was retreating at a rate of 17 km/yr. This is an average rate 3 times faster than it retreated in the mid-1990s. The Jakobshawn Glacier is the largest single contributor to sea-level rise in the northern hemisphere.