Besides Japan, do other cultures have a tradition
I had sashimi just two months ago in South Korea. It's very common and certainly part of their food culture
In Europe, traditionally it's steak tartare, NOT tuna tartare. Tuna tartare was invented fairly recently, and I wouldn't classify it as part of any regional food culture.
Crudo is Italy's take on sashimi. I believe Italy also originated beef carpaccio.
Those ubiquitous, trendy poke bowls originate in Hawaii, but obviously are based on Japan's sashimi/sushi dishes. Personally, I think they are away of ruining perfectly good raw fish. I think it's deconstructed sushi - made by lazy people. I'll also predict the trend will be kaput in 5 or less years. Sort of like all those frozen yogurt shops that were on every street corner a few years ago.