[rdl]

I’m in Niseko (Hokkaido) and had just driven 2.5h through a snowstorm to my hotel, opened door, and put down bags and phone. Weird alarm from my phone (new phone; forgot to disable, which I usually do because where I live abuses the system for a bunch of stupid alerts for chronic issues), looked at it, realized in Japan it is probably real, so I stood in a doorway. Pretty decent sized storm.

If a tsunami affects me on a mountain something would be seriously wrong, so I’m not going to worry.

[hamandcheese]

Do those alerts work for foreigners on data-only SIMs?

[jen729w]

Yes. My partner got one in Morioka about 6 weeks ago.

Edit: very, very quickly after the quake, which we felt, I might add. I got a notification via the 'Safety tips' app long after. I think I was on Airplane mode at the time.

[rdl]

Unclear. I have a t-mobile e-sim in the phone I was using and that worked for me.