Iceberg D-15C Has Calved from Iceberg D-15B

By LTJG Jared Doris, USN
NIC.PAO@noaa.gov
301-943-6977
February 13, 2026

Suitland, MD — The U.S. National Ice Center (USNIC) has confirmed that iceberg D-15C calved from D-15B in the southern Amery Sea along the West Ice Shelf. As of February 13th, D-15B was centered at 67° 02' South and 81° 34' East and measured 21 nautical miles on its longest axis and 12 nautical miles on its widest axis. D-15C was centered at 66° 50' South and 81° 03' East and measured 14 nautical miles on its longest axis and 7 nautical miles on its widest axis. D-15 originally calved form the West Ice Shelf and once held the title of world’s largest iceberg.

The new iceberg was first spotted by Dr. Jan Lieser of Australia’s Bureau of Meteorology and confirmed by USNIC Master Ice Forecaster Isabelle Marcus using the Sentinel-1 image below.

Iceberg names are derived from the Antarctic quadrant in which they were originally calved. The quadrants are divided counter-clockwise in the following manner:

A = 0-90W (Bellingshausen/Weddell Sea)
B = 90W-180 (Amundsen/Eastern Ross Sea)
C = 180-90E (Western Ross Sea/Wilkesland)
D = 90E-0 (Amery/Eastern Weddell Sea)

When first sighted, an iceberg’s point of origin is documented by the USNIC. The letter of the quadrant, along with a sequential number, is assigned to the iceberg. For example, C-19 is sequentially the 19th iceberg tracked by the USNIC in Antarctica between 180-90E (Quadrant C). Icebergs with letter suffixes have calved from already named icebergs, where the letters are added in sequential order. For example, C-19D, is the 4th iceberg to calve off the original C-19 iceberg.

The National Ice Center is a tri-agency operational center represented by the United States Navy (Department of Defense), the National Oceanic and Atmospheric Administration (Department of Commerce), and the United States Coast Guard (Department of Homeland Security). The National Ice Center mission is to provide the highest quality strategic and tactical ice services tailored to meet the operational requirements of U.S. national interests and to provide specialized meteorological and oceanographic services to United States government agencies.

For more information, please contact:
National Ice Center
Command Duty Officer
Voice: (301) 943-6977
E-mail: nic.cdo@noaa.gov
Twitter: @usnatice
Facebook: @usnatice

The U.S. National Ice Center is a tri-agency center operated by the Navy, NOAA, and Coast Guard and provides global to tactical scale ice and snow products, ice forecasting, and related environmental intelligence services for the United States government.