Someone on the last thread posted me about the collapse happening 100 years after the Red Year. Im not disputing this, I'd just like to see the source so I can get a better grip. I don't like being so wrong about something!

If it happened 100 years after Red Mountain then is very doubtful that Red Mountain had anything to do with it.

The crisis seems quite localised to the city of Winterhold concidering the scale of damage.

It is doubtful the Thalmor are capable of causing something on the scale (or else they'd use it on the battlefield and would be unbeatable)

It's nothing to do with Solstheim or else we'd have stumbled upon clues during the "Dragonborn" add-on.

It is doubtful to be the Eye of Magnus as it wasn't actually in the City of Winterhold at the time so why Winterhold?

... Anymore?

Yeah, sorry, it was a http://www.uesp.net/wiki/Skyrim:Loading_Screens#Winterhold:

The events of the Red Year took place in 4E 5. Mind, the events of Red Year did release a Tsunami, which hit the Summerset Isles, as the http://www.imperial-library.info/content/infernal-city-lore-notes.

The event of the Great Collapse didn't look like a tsunami either, given what we know of them in the real world.

http://www.imperial-library.info/content/great-collapse reads:

So the Great Collapse was not facilitated by a gigantic wave, but by a year-long assault of terrible storms.