I wonder how they came up with this term 'aftershock'. What does that mean? I always envisioned it as some sort of reverberating energy, but that makes no sense. I've always thought of 'aftershocks' as some echo of the original event that somehow, coming out of nowhere, can topple buildings, when in fact what they are are just additional earthquakes.

So, yeah, I'd be worried that the big one has yet to hit.