Earthquake?

I just got back into my office following our earthquake evacuation. It wasn't a drill, but no one felt anything to indicate that we were actually being hit by a magnitude 6 quake (it needs to be that big or bigger to activate the evacuation alarm). As of now, the assumption is that it was a false alarm triggered by a glitch in the system. Oddly enough, however, it turns out that the earthquake evacuation alarm is actually significantly quieter and far less obnoxious than the alarm set off by the in-building seismic stations every time they register anything. Really small stuff. Multiple times per day. Because it's apparently just too much work for the seismologists to just go check their machines every so often without announcing every earth-twitch to the entire building. Seems a little backward, personally.