The poor Mexicans are trying to fend off earthquake panic. They've had a few little earthquakes and people naturally associate 'momentum' with this, especially after the recent events.
I love this area, as it has some of the cleanest subduction zones in the world. This is one of the 'ripest' areas for M9's, but they are every 500 years, with an uncertainty of 500 years. So I wouldn't count my earthquake chickens. There are hundreds of places that are fighting to be the next 'Big Earthquake Loser'.