People were freaking about the July megaquake prophecy and nothing happened. Trying to time it is silly, just chill and enjoy your stay, you'll probably be fine.
Was in a hotel in Sapporo, almost got thrown out of bed. Lot of people in the hotel lobby now.
Considering leaving Hokkaido by air if a Hokkaido and Sanriku Subsequent Earthquake Advisory is issued, don't really want to be in a potential megaquake.
https://finance.yahoo.com/quote/UBI.PA/