B777 first officer reported encountering wake turbulence during cruise flight.

Attributes
ACN	1567021
Time
Date	201808
Place
Locale Reference	ZOA.ARTCC
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 242 Flight Crew Type 12060
Events
Anomaly	Deviation - Track / Heading All Types Inflight Event / Encounter Wake Vortex Encounter

Narrative:

During entry into class ii we encountered wake turbulence from an aircraft 23NM ahead and 1000' above. We executed slop (strategic lateral offset procedure) left 1NM in the FMC route page to avoid any more wake [and] some possible turbulence from the weather ahead. We returned to the right side approximately 10 minutes later.

Original NASA ASRS Text

Title: B777 First Officer reported encountering wake turbulence during cruise flight.

Narrative: During entry into Class II we encountered wake turbulence from an aircraft 23NM ahead and 1000' above. We executed SLOP (Strategic Lateral Offset Procedure) left 1NM in the FMC route page to avoid any more wake [and] some possible turbulence from the weather ahead. We returned to the right side approximately 10 minutes later.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.