You can never be totally prepared for something like what happened in Mexico City. The Magnitude 7.1 was bad, the 8.2 from 32 years ago was worse. However, we live in a single story built to California EQ code and fortunately we don't live near the major faults (there's more than one) so it should remain standing. That said, while my humble dwelling probably won't be an issue; area wide infrastructure will be an issue and some of that by necessity, crosses fault lines.

Hikermor and I have had this discussion in a thread from way back. After counting fingers and toes, I'll put on my boots because you never know what broken glass is out there in search of a bare foot. Shutting off NG is next. After that, hopefully the garage door won't be bent and unable to open; assuming the door does open, the truck is a mobile kit so I want it out on the street where it's not subject to having a house fall on it. Remember there will be aftershocks and one of those may finish a job only started by the first EQ.

Then we assess the overall situation: electricity, water, major roads, bridges, et al. A lot of that info will come from the local news. If cable is still up we'll probably still have internet and if that's up it's just another day following a typical SOCAL EQ and no big deal. But we're talking about Mexico City's Mag-7.1 and if we have buildings and bridges doing what happened there, then I seriously doubt such niceties as electricity, water, cable TV and internet will be available. Hopefully a local radio station will still be functioning. It will be a really bad come-as-you-are disaster.