Although ethnic Koreans make up only 0.5% of Japan’s population, 30% of Yakuza members are ethnically Korean. I suspect they are mostly underlings and thugs.
A fart is 59% nitrogen and 9% carbon dioxideMethane
There is no accurate way to predict an earthquake, the most reliable way seems to be if there is a unusually high number of people looking for their cats at animal shelters. It is difficult to track wild animals like coyotes and wolves in the wild.
Animals behaving strangely? Or deserting areas.