My parents and I live in a rural area on the west coast. It's all about wildfire, baby. (Maybe earthquakes might be a problem but we're far enough inland that we don't usually see any.)

We've had to massively step up our fire break game, to the point of purchasing a larger brush cutter for our tractor to handle it all. Every fence line has a 50ft wide cut on either side and roughly 40 acres around the house itself is cut to bare dirt.

We've limbed all the pine trees near the house up to about 18-20ft off the ground, and taken out a lot of young trees that would provide ladder fuel. Any of the trees within a few hundred feet of our house get watered 3-4 times during the summer to keep their moisture content up.

We have a 250gal, 21hp wildland fire pump that lives on the back of our winter feed truck from May until October. It can spray about 80 feet...
We also maintain an 7500gal swimming pool with the filter pump plumbed up to act as a transfer pump into the fire rig for quick refilling.

Additionally, my dad added two large rain bird sprinklers to the roof of our house that can each dump about 8 gallons a minute of water out from our well, maintaining a wet zone about 20ft around all sides of the house, which has concrete fire-resistant hardiboard siding on it. The well itself is also set up to run from a propane backup generator if the power company cuts service during a fire.

There's really not much else we can do beyond having our critical documents in a briefcase and praying.