With authorities urging residents across a large swath of Japan, from Hokkaido to Chiba Prefecture, to review their disaster readiness following Monday's magnitude 7.7 earthquake, and with the issuance of a 'subsequent earthquake advisory,' households need to be ready for any potential large-scale quake.The following are tips and recommendations on how to prepare.Authorities are urging people to be ready to evacuate at any time, with the following checklist to keep in mind: