Some of the more "mundane" natural disasters that occur could end up being pretty dangerous in the T2K setting. Without adequate command and control, as well as the manpower and air resources, forest fires/wild fires would be absolutely devastating. Think of the fire in California this last year where houses were burning. Imagine those fires without the people to fight against them, or the aircraft to help drop retardants on them. Whole cities would literally be burned down.
Other things like floods and/or mudslides would be seriously damaging. You'd lose roads, bridges, key transportation points! Beyond the property damage that they could cause, those things also bring in lots of disease. Sewage system back up, industrial chemicals and other things end up seeping all over, and clean water gets polluted. Plus, without equipment, or men, or someone to organize the rescue/clean up effort, you're going to have a lot of people dying.
Earthquakes can be damaging, but they're really only damaging to standing structures. Most earthquakes are pretty localized in the area of damage. They usually don't invite disease, and unless you've got people moving around unstable stuff, the aftershocks really aren't going to do too much more than what the main earthquake did. So, for places that get hit by earthquakes fairly frequently (Southern California), you could have some damage from earthquakes, but not as much as what you would suffer from a wild fire.
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