The Tustin Unified School District will participate in the fourth annual California Great Shake Out at 10:20 a.m. Thursday, Oct. 20.

The statewide earthquake drill is the largest of its kind conducted worldwide, according to Student Services Coordinator Ray Chacon, who is coordinating the event.

All schools and the District Administration Center will participate in the drill.

For more information, call the TUSD Communications Office at (714) 730-7339.