Indeed, as shows the master of all us: Wipneus
, we must use both: Sentinel 1 and Sentinel 2 and sometimes you have to use Sentinel 2 by zooming in as much as possible.
As an example,
a little anecdotal, a fact that intrigues me: I thought that the rift R1 (the northern) would have quickly joined the rift R2 rift (the southern).
The image of 03/12, with the zoom that I usually use, did not give much, but, intrigued by the image Sentinel 2, I looked more carefully and currently, in place of an extension of R1, we are witnessing the opening of several parallel cracks shifted to northwest.
In other words, the tensions are still there, but the structure of the glacier being weaker downstream we see the opening of parallel crevasses in this area, crevasses that will finish to connect between them and R1.
And for now, R1 and R2 do not seem to have to meet.
Another anecdotal fact: there is a small current in R2