Granted, this is probably common sense, but...
I've had one snake since the Northridge quake in 94. Both have always been in tanks, and they tanks have withstood a couple of good shakes - starting with Northridge quake.
I've always planned where to put the tanks based on earthquake safety, and I think I've done a pretty good job.
However, last night's little jolt actually sent one tank into the other - causing a crack. My best guess is the tanks got pushed a little too close together during the last major cleaning.
Fortunately, I have tubs set-up, I'm just working on temp adjustment right now.
But, what if the quake was worse? My female could have been seriously injured from that - especially if there was any shattering. (Okay, she was under her hide and mostly protected, but still...)
That's not going to happen with tubs - even if they do crash and knock together.