Here is a gif from Jan 5 (?) to Feb 1 of the rift in the SW Tributary glacier next to PIG from
Thanks for this nice gif sequence highlighting the opening of the rift in the SW Tributary ice shelf. The attached image shows a Sentinel 2 image from Feb 2 2017 of both the PIIS and the SW Tributary ice shelf, to which I have added a segmented yellow line indicating the approximate location of where I am concerned that the next upstream crack will occur in the PIIS as the rift in the SW Tributary ice shelf continues to open. If I am correct, the opening of such an upstream crack would cause a major calving event along the location of the current crack in the PIIS.