I've been through more quakes than I can count, including being in the strongest zone of the 1994 Northridge, CA, quake.
Add to that many small ones in Puerto Rico, and many in Ecuador and Mexico City... including one where the hotel I was in could be heard hitting the next door building from the swaying; that hotel, the Regis, came down in the "big one" killing several hundred guests and employees.
In every case, as soon as possible (in a number of cases the shaking was so strong that I could not stand up and balance) I turned on a battery powered radio (always had several in convenient places when living in quake territory) to hear what was going on. At the same time, I called the stations I owned or worked for to see the effect on our facilities.
Today, my question is: what is the first reaction of different age groups?
Those over 45 or 50 will likely try to find information on radio or TV. If there is a power failure, TV would be impossible. Many will no longer have a radio, and most home routers will either be dead or only have a short battery-aided service life.
Many will turn to cellular phones, and find that lots of cells don't have backup. Others have battery backups that last short periods. A few, such as those on dedicated terrains, may have generators but with fuel for a limited period.
In Hurricane María in Puerto Rico in 2017, all but 2 of over 120 radio stations were off. All TV stations were gone, with the "big two" losing their 1000' towers. Wired connectivity with over half of all cellular sites was damaged. For a while, less than 10% of cell sites actually worked, and then only in their own immediate area. Some parts of the Island went months without electricity... almost nobody had power for a week to 10 days.
So what would younger adults do? How about people in their 30's and 40's? And those over 50?