Thinking of the ocean it looks very much like a spouting out event took place though at that scale I guess it was rather subdued. Sometimes there's a kind of yinyang effect where there's an 'implosion'/dimple in the water before the spout, you can often see these [spouts] at the change of tide, at a very small scale they appear like satellite dishes with a water 'antenna' emanating from the center. So I suspect a change of direction, of ocean movement, caused a series of waves which caught up on one another leading first to a depression/compression event on the surface, then that pressure event 'lost ground' to the rotating frame and emerged to raise/expand the surface.
