I got a notification (in Santa Cruz) that mentioned a magnitude (4.9), a distance (~30 miles), and that I should expect mild shaking. I saw the notification a few seconds after it arrived, because my phone was making a weird noise, and the shaking started immediately after I read the notification. It was probably the strongest earthquake I have experienced in the ~5 years here, but there were several similar earthquakes every year when I was living in Chile.

If you send notifications for minor earthquakes like this, an estimate of the intensity is mandatory. At least in countries like Chile (and Japan?) where earthquakes are common. Otherwise people will learn to ignore them as false alarms.