There were hints before with the old images, but now the radial fractures in the crater are quite apparent. There is a nice example of fractures from the center to bottom of the scene. Another group exists between the center and the spots to the "northeast". To my eye, these look like the sorts of fractures that develop when material is being removed from below. Also, note well the hummocky terrain in the bottom of the crater. Material is moving down the slopes and from more than just landslides. In my opinion, the crater floor is collapsing. Strong evidence that there is either ice or salt tectonics at play. Or both.