Fig. 1From: Unified approach for evaluation of horizontal site amplification factors with special reference to history of studies on the effects of surface geology on seismic motionMap of the areas with heavily damaged buildings and houses in Tokyo with their surface geology (after Kitazawa 1926). Outcrop regions of the diluvium formation are colored yellow, buried regions with thin alluvium pink and red, and thick alluvium regions whiteBack to article page