Frankly, I don't think I've ever experienced anything quite like it. It is as though Tamriel itself is being torn asunder or sucked into a blackhole.
This happens when daedric tomb is cast on multiple targets that are bunched up in a cluster (I think it is when a mine happens to be cast on top of two+ targets). It's like the screen shakes once for each target hit by each mine, and all the shakes go off in a short period of time. This doesn't happen if it is cast on one target, or multiple targets that are not stacked on top of each other. But when it does happen.... I'm not sure if this is just happening on my screen or if it happens to the people that are being cast upon, but it's a little cray cray.
Joeshock- AD NA AB Thorn Chill Sorc New Eden Low Sec Roamer
Fight not with monsters lest ye become one