Youd added the best things to do is to secure things from falling over. You need to tie things down like strapping water heaters and other objects. Bottles on shelves are also very vulnerable. Also with the amount of movement and the liquefaction likely with a large quake, basic services like electricity, water, gas, grocery stores and even emergency response may be disrupted. We have to be able to take care of ourselves.
Some preparation is needed even for an even relatively unlikely event like an earthquake.