This webicorder out of Wyoming suggests there were two quakes. USGS just updated. Another 6.9 a few minutes after.
http://www.quake.utah.edu/helicorder/imw_webi.htm
Umm... check yer URL, FRiend. It's "utah.edu" :-)
Wow! This is awful when they’ve hardly begun to clean up from the big one.
Looking at that Webicorder... the whole land mass IS STILL MOVING. See that long wave form on the red line? Yea, thats movement, the plate was moving and in a relatively free manner. Thats actually good news if correct, it will let the pressure out with out the huge shock of sudden movement.
This one rung the earth like a bell again.