Here in So. Cal. It would be for the big one. An earthquake that would kill power for the entire area for days, damage transportation routes, bridges and roads, buildings toppled which will lead to chaos.
What have I done? My daily driver, 4x4 Tacoma has VHF, UHF and HF so that’s covered. I keep a tote filled with a semi survival kit with water, some food, flashlight, first aid, rope and a bunch of just stuff, shoes, pants and the all-important TP. At home, again VHF, UHF & HF covered. A cheapo 900-watt 2 cycle generator, the travel trailer with 2 RV batteries and a 3500-watt generator. The garage freezer has 3 2 ½ gallon waters frozen in the bottom for water supply and keep the freezer cold longer.
When it finally hits it’s gona be bad. Mostly because the common person does not prepare and within 2 to 3 days let alone a week desperation will set in and it will turn to protection what you have. But that’s another story for another thread and another site.
Erik N6NWW