Have a plan. This includes how to communicate with loved ones after the shaking stops.
Practice, Practice, Practice. Do earthquake drills with your family and coworkers. This will help identify safe locations for cover when the shaking starts.
Store supplies such as water, non-perishable food and a copy of important documents
Communicate with local authorities to find out what local plans and programs exist
Find out how safe your home workplace/school is. Older buildings may pose a greater hazard and newer buildings are built to different criteria depending on their usage.