Interstitial,

I looked in Worldview which gives the speeds, but relative to 30/12/2011 and I find a maximum speed of 400 m/yr in the middle between Steele Island and Butler Island and 160 m/yr between Butler Island and Cape Mackintosh

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https://worldview.earthdata.nasa.gov/?v=-1795024.1235806216,913897.3490050219,-1598416.1235806216,1006313. 3490050219&p=antarctic&t=2011-12-30-T18%3A25%3A07Z&l=Coastlines,MEaSUREs_Ice_Velocity_Antarctica,MEaSUREs_Ice_Velocity_Greenland,Reference_Labels(hidden), Reference_Features(hidden),VIIRS_SNPP_CorrectedReflectance_TrueColor(hidden),MODIS_Aqua_CorrectedReflectance_TrueColor(hidden),MODIS_Terra_CorrectedReflectance_TrueColor(hidden)"

I checked the speed of a point between Steele Island and Butler Island, for which Worldview gives a speed of 280 m/yr in 2011, using the Sentinel2 images from 23/10/2019 and 17/10/2020 and I find, for the same point, a speed of 340 m/yr (± 12 m/yr taking 2 px as error).

Even if the oldest Sentinel1 image of the zone dates only from 09/07/2020 (120 days before the one of 06/11/2020), which makes a too narrow base to calculate speeds of a few hundred meters per year, I wanted to make a test anyway and, for this same point, I find a speed of 365 m/yr (happy coincidence, an error of only one pixel corresponds to an error of 60 m/yr!).

We can conclude that, at least for this point, there was a significant acceleration (25%).

For the moment no more detailed analysis, this sector does not fit, for the moment, in my schedule.