As noted earlier in the thread, do you have an Emergency Alerts app in your app drawer? In other words ... Apps > Emergency Alerts
That's where it's now located on some other Galaxy devices. If the app is there, tap it to open it, then click the Menu button (the three dots in the upper right-hand corner); that'll open to Settings. Tap that and you should have choices such as Alert Types. Tap that and you can uncheck Extreme Alerts, Severe Alerts, or AMBER alerts.
I have an S9+. There is no emergency app. I did find a setting for emergency alerts but the toggle is grayed and therefore won't let me turn it off. I tried clicking the setting to see if it would give me individual alert options but that didn't show anything useful.
We truly understand that unwanted alerts are never fun and we will assist you to the best of our abilities. Where exactly are you getting these alerts (via text message or just a phone notification). What messaging application are you using? Have you looked through the settings of the messaging application used to see if you have any alerts enabled there? EdwardL_VZW
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