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Rift plays an important role in ice shelf calving event, which forms theboundary of tabular detachments and the acts as precursor for ice shelfcalving. Rift m\'elange shows the resistance to deform during rift propagation,which plays the role as stabilizing the rift. However, the detailed 3Dpropagation process of the rift, including the dynamics motion of itsm\'elange, is not clearly investigated since then. In this paper, a long timeseries of 2D propagation rates are generated to provide an overview of allrifts throughout the FRIS, which reveals that the rift T1 and T2 were quiteactive and will dominate the next calving event. Then, the process of wideningof rift T1 is detailed investigated, which is representative for riftpropagation process. By utilizing REMA DEMs and ITS_LIVE ice velocity maps, theprocess of m\'elange widening and rift wall widening are estimated. Them\'elange widens linearly in space and rift wall widening is caused bycollapse. The processes of m\'elange height decreasing and m\'elange wideningboth reveal linear patterns during rift widening process. Rift widening processshows seasonal variant, which is attributed to the seasonal variant of riftwall widening. However, m\'elange widening reveals a stable trend, which provesits stability. The seasonal variant of rift wall widening is further explainedby the collapsing process during different seasons. The process of riftpropagation worth long-term monitoring both vertically and horizontally in thefuture, which is significant for ice shelf calving ice shelf instabilitystudies.

Widening process and seasonal dynamics of the large-scale rift and its m\'elange in the 2nd largest ice shelf in Antarctica