With a low crime rate, Japan is one of the safest places in the world, but it is also prone to natural disasters. A 2011 earthquake and tsunami left more than 18,000 people dead or missing in the northeast. The last major earthquake in Tokyo, in 1923, sparked fires that burned wide swaths of the city and killed 140,000 people in the area.The Tokyo disaster guide, with every page printed on bright yellow paper, is intended to help citizens prepare for and survive a major emergency in which power, water and heat may be lost for days. It opens with an ominous warning: "It is predicted that there is a 70 percent possibility of an earthquake directly hitting Tokyo within the next 30 years. Are you prepared?"