Volume isn't just lower compared to post-crash, but also before that:
That's probably because of the recent incidents with regulations. Many people are waiting until that is cleared up before they can confidently trade again on Gox. Until then the volume will stay extremely low, with short increases in volume during price changes.
Don't you mean short increases in volume during
funding changes?
What are funding changes?
Re Frozenlock's comment
All this talk about low volume is a little parochial, the price has jumped an order of magnitude, so naturally new Bitcoin traders and speculaters, are trading within that new band. If you measure volume in USD, it is roughly trading an order of magnitude higher too, so volume isn't as big of a deterrent given all the profit taking (new Bitcoin registration number plates) I've seen.