There is a wealth of detailed info in this dream.

I have taken the liberty to represent the key dream info from the OP by reformatting it into bullet points with headlines for easy analysis and reference:

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In my dream last night,

EVENT & LOCATION:

- there was an earthquake on the northwest coast of Africa that occurred while a massive tropical storm was forming in the Atlantic.
- There was a big island that had land "sunsidence" (subsidence ? In the dream it was literally written as "sunsidence" lol) that triggered a tsunami,

AFTERMATH:

- the aftermath of which was quickly seen in regions east of the "island" collapse, like Africa, UK, islands, etc.
- This wave was smaller on the east though,
- and was warned about to the countries of the west.
- The most remarkable thing in the eastern areas was newly exposed lands in the UK and north Africa/Europe area that were said to be ancient cities.
- The map looked horrendous.
- Basically middle America was in red, down to Brazil, and up to Maine and beyond.
- This zone was the cataclysmic zone where entire coast lines were expected to be wiped out.
- The call was for any and everyone to head to their highest elevations.
- Florida, Georgia and the gulf looked absolutely fucked.

HURRICANE

The scariest thing was the hurricane.

- As the tsunami blew through it during formation,
- the thing roared to a huge cat 5,
- larger in size than anything I've ever seen.

MORE AFTERMATH:

I did not see the aftermath of the storm, but

- the wave created a brand new refugee situation in the western world and
- many, many people lose lives on coasts.
- Those who survived went to Appalachian mountains and Rockies.
- Even the plains were flooded and the Mississippi basin was stagnant, flooding surroundings.

Misc. FEELINGS & RECALLS

- It was really bad!
- I do recall the storm name was similar to the Guardians of the galaxy character "groot" and that was kinda funny to me,
- probably a silly dream manifestation.

SIZE OF WAVE:

- The wave took nearly a full day to hit and was half as tall as lady liberty!
- By this point, people were stuck in buildings and on mountain tops with no clean water or food.

DEATH TOLL:

- Millions died and millions more were likely to follow.
- It was an intense sadness, lands were literally breaking apart...