chinese folks built a bunch of equipment and put it into service prior to going on new year vacation.  during vacation they took orders for a shit load of gear.  once they came back to work they unplugged the miners, packed them in boxes and shipped them to their customers.  you will see all of the hash come back within a week when customers receive their miners and put them into service.  you will also see a lot more hash from the newly assembled miners chinese turn on