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If you're writing about real people and real events, that's
"non-fiction"/"journalism". If you write it in the style of a novel,
it's "creative non-fiction".
If you're writing about made-up people in real events, that's
"historical fiction."
If you're writing about made-up people in made-up events in the real world, ...
2
The problem with this approach is that it confuses the reader. The genre label is a signal to the reader that this story is one of those type of stories. A reader who is looking for a comfortable reading experience picks a story labeled as a mystery in the expectation that it contains all of the elements of a mystery. There may be some other elements but ...
1
If your story is in the USA in the past it will be historical fiction. No doubt there is evidence of a number of large tsunamis in the present USA in the past, but if your story happens after the USA was founded the number will be smaller.
If your story is supposed to happen more or less in the present it will be contemporary fiction. Obviously, a tsunami, ...
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