After a major earthquake, civil authorities will inspect your neighborhood to see whether damage has occurred, and they might determine that your house is dangerous to live in. This is due to fear that the structure might collapse with you inside. If your house is labeled with a red tag, you will not be permitted to live in it, and the house will have to be torn down. If your house is labeled with a yellow tag, you will be ordered to leave and will not be allowed to return until the necessary repairs are made, and your house is determined to be safe to live in. Accordingly, you should have ready those items you need if you are forced to leave your home for an extended period of time.
It’s nice to have a first-aid kit, but make sure that you and your family know how to use it. Take a first-aid course and a CPR class (there are lots of reasons to do this, not just earthquake preparedness). You might be called on to help your neighbor, and access to a hospital may be blocked.