The total trade volume today (Sat Mar/15 00:00-23:59 UTC), at the exchanges that I monitor, was just a little over 100 kBTC. That is 49% less than yesterday, and 67% less than last Saturday Mar/08.
Indeed, the last three times since the total daily volume has been this low or lower were
Jan/29--Feb/05 (volumes ranging from ~54 to ~91 kBTC): Chinese New Year holidays, banks closed in China.
Sunday Feb/19 (~95 kBTC): eve of MtGOX's second announcement.
Sunday Mar/02 (~94 kBTC): perhaps eve of Bloomberg TV "important announcement"?
Volume outside China dropped 63%, from 19 kBTC to a ridiculous 7 kBTC. All exchanges lost volume, the largest ones more in proportion. BTC-e (with 2.55 kBTC) returned to first place, followed by Bitstamp (2.20) and Bitfinex (1.74).
Volume in China dropped 48% (from 179 to 93 kBTC). OKCoin (59% of the Chinese total) increased its advantage over Huobi (39%). The dwarf exchange Bter was the only one that I monitor that had more trade than yesterday, from 0.19 to 0.35 kBTC.
China's slice of the total volume increased again, from 91% to 93%.