I live in Aomori (Northernmost prefecture of Honshu) and we got the warning before the earthquake arrived by all the cellphones in the office going crazy at the same time. It was kind of funny, because we have a lot of new guys here who have never been to Japan before and it was their first earthquake ever xD
How much warning did you get? I mean in minutes or seconds?
was reading in a park in suburban tokyo a few years ago, notifications arrived for the noto peninsula earthquake.
kids in the park stared doing wobbly knee dance :D
felt the quake about 30sec later.