Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 11
Situational Awareness
Inflight Event / Encounter Weather / Turbulence; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Separated Traffic; Air Traffic Control Issued New Clearance; Flight Crew Returned To Clearance
Aircraft; Environment - Non Weather Related
Aircraft X reported descending for severe wake turbulence before entering my airspace. I observed the change in altitude during a transmission to another aircraft that had been blocked. As I went to talk to Aircraft X; he reported descending for severe wake turbulence. We discussed possible traffic in the area and I determined that it was probably wake turbulence from Aircraft Y which was approximately 10-12 miles in front at the time of the incident. I descended Aircraft X immediately to FL300 to get Aircraft X under control and keep them out of the wake turbulence and then immediately notified SLC sector 46 to advise them of the descent. SLC sector 46 released control. I then assigned a slower speed to Aircraft X to make more room since Aircraft X would be following Aircraft Y into LAS; the winds were about 50kts out of the NW at the time. It is not unusual to get bad rides in the area; but no other mod to severe turbulence was reported before the incident.Not sure of any recommendations because this is an unusual situation.
ZLA Controller reports a Hawker 125 reported severe turbulence; the aircraft was following a heavy B767-300 on the same route 10 to 12 miles ahead.  The Controller gave a further descent clearance to the aircraft to a suitable altitude.