Ask HN: Google spike of direct traffic

over the past 2 weeks we've seen a very high spike in direct traffic to our site.

i've attached pictures below:

http://i40.tinypic.com/1zv3jn4.jpg

http://i39.tinypic.com/15qogop.jpg

we basically jumped from 5000 a day to 15000 a day with most of the increase being targetted towards only 2 of our pages with high bounce rates and small "avg time on site".

any one else experience this? i look at the logs and the traffic is not from one IP. the top 30 big hitters are all different IP and subnets.

any google experts willing to shed some light on this?

Thanks!