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I received the earthquake alert about 45 minutes after it occurred.

The Apple alert came in at 12:05pm warning of aftershocks but not the primary event.

In the Bay Area, everyone gets an SMS message that says an earthquake is coming. I've felt/heard the shaking 10-20 seconds later.

Some industrial equipment shuts down to avoid damage.

We felt it at 10:26 am ET. And an alert was sent to everyone at 11:24 am that an earthquake is coming. And then another one alerting for possibility of aftershocks. No aftershocks felt.

Same experience -- felt a shaking; thought maybe a heavy truck had passed by for a second, then saw that all the monitors were swaying. Checked USGS and saw nothing, so figured it was nothing, because on the west coast they have the reports up lickety split. Half hour later everyone's phone started buzzing with the automated alert.