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Voluntary disaster preventionGeographic Characteristics of Tokyo　The capital Tokyo is located in a region that forms a characteristic and complex plate structure, with the Philippine Sea Plate subducting under the North American Plate from the south, and the Pacific Plate subducting under these plates from the east. 　In particular, earthquakes occurring within the Philippine Sea Plate can occur directly beneath any location. In the southern Kanto area, it is assumed that the direct hit of an M7 class earthquake occurs several times between the earthquakes of the Great Kanto Earthquake class which occur at intervals of 200 to 400 years.　In addition to the electricity that powers its urban functions, Tokyo also depends on other regions for many materials such as food and daily necessities, so even earthquakes outside of the metropolitan area can affect the city, such as cutting off the power supply or disrupting distribution.　Tokyo has historically been hit by natural disasters such as major earthquakes and volcanic eruptions. The impacts of climate change have led to more severe and frequent natural disasters such as floods and typhoons, as well as the risk of a major earthquake in the capital region, large-scale volcanic eruptions, and infectious diseases. The possibility of disasters occurring at any time is expected to continue, and there is also a risk of multiple disasters occurring simultaneously. This guide book has been published in order to inform you of the various efforts that the Tokyo Metropolitan Government (TMG) is making toward disaster prevention. 　Self-help, mutual assistance, and public assistance are important for improving the ability to respond and cooperate in the event of a disaster in order to minimize the disaster damage.Protect your own life.Self-helpSearch & rescue and other assistance from government Mutual assistanceResidents protect their own communities.Public assistanceagenciesImportance of self-help, mutual assistance, and public assistance31. Natural Disaster Risks(1) Earthquakes　Earthquakes that Could Foreseeably Strike Metropolitan Tokyo　Tokyo in the past has been much damaged by large earthquakes such as the Great Kanto Earthquake. Further, the Great East Japan Earthquake demonstrated that there are some earthquakes that even though remote can cause chain-reaction damage.Section 1　IntroductionSection 2 Preparation for Natural Disasters