I currently own a Nexus 6 that I purchased from the Google Play Store about a month a ago. One of the features of Android 5.0+ is that when you insert a carrier SIM card it will install carrier specific apps to your phone. I was pleasantly surprised that it installed the NTT Docomo Area Mail app for emergency alerts. I was quickly disappointed when it said that it didn't support my phone so I uninstalled the app.
With the strong earthquake that we had today I was surprised that I got an Area Mail alert even with the application not installed. I did find that the "Cell Broadcast Alert Service" was running and had started at the exact time the earthquake started.