[Greenbuilding] Sure haz been quiet around here lately!

[molasses at q.com]

Three trusses?  I hope, then, that they are far beefier than trusses that are meant to go every 16" or 24" oc?  Made of, say, 4x8s, and then have purlins running perpendicular across or between the top chords?

If your house was built before 1970 or so you probably don't have any bolts tying the foundation to the house above.  That's a common retrofit (and then you can get earthquake insurance).

Floor joists are not normally held to posts with straps.  Actually, floor joists usually don't rest on posts - they rest on beams which rest on posts, which is probably what you meant.  And the beams aren't normally strapped to the posts.

Hurricane ties and straps and anchor bolts and so on - these are all very new things.  If your house is older it will be held together with nails.  These old homes hold together pretty well (partly, I believe, because they have a large wall-to-window ratio).  As you can see from other earthquake-prone areas (Seattle, San Francisco, Portland), this usually works.  There are a LOT of old homes still standing despite a lot of earthquakes over the years.

Sounds like you need to get someone out there to look at the cut beam and while they're out there you should have them give you an estimate for foundation bolts and look at the roof.  Any competent builder should do.  By the way, didn't you get the house inspected when you bought it?  The inspector should have noted any structural deficiencies.

-Kat