Earthquake alert falsely reports magnitude 9.9 and intensity 7 in Japan (twitter.com)

OP here, still a bit shaky from this.

I've been living in Japan for quite a while now, but never in my life have I looked at my phone and seen a magnitude 9.9 earthquake warning.

It was in fact a 6.9 magnitude near Kamchatka, so 1000 times less intensive than falsely warned.

Yes, that was a very scary for 5 minutes or so, and a visceral reminder that alerting is difficult.