- Feb 10, 2010
Lots of burglar alarms are meant to detect people messing with windows. They do this with a foil on the edge of the glass that will break if the window is broken. Perhaps the explosion damaged the foil.
Windows will shake at even the slightest explosion-the foil or piezo based alarms will often be set off by, say, a gas oven failing to ignite and causing a small explosion.