We report the progress of our research on buildings and their surroundings for disaster prevention in Chuo-3, Ota City, one of the areas in Tokyo, Japan that is Densely Built-up Wooden House Areas in Tokyo, Japan. We conducted an exhaustive survey of 383 buildings and roads in the northwest area of Chuo-3. The buildings and their surroundings were considered. Next, we conducted microtremor measurements on the ground in the area. The major findings of the investigation are summarized as follows. (a) Over 80% of the buildings are detached houses, and some have billboard architectures. Slate and pantile are used as the roofing material for all the buildings. (b) The buildings are densely packed. Some adjoin the frontal road with a separation of 2 m or less. (c) According to the mictotremor measurement of the ground, the H/V spectrum changed gradually from the west to the east.
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