How do i keep my children safe in a major earthquake?! help!?

i live in california. quake zone. i have 2 very small children. ages 2 months and 3 years. i am scared to death every day because i am at home alone alot since my husband works outside the home 40+ hours a week. my question is what do i do if a major earthquake hits us while i am at home alone with the children? how can i keep my children safe and alive if something like this happens? ever since ive been hearing about the quakes in chili and haiti i am scared out of my wits. i dont want my children to die. please help!