Relationship between land use and slope of flexure zones in active faults throughout Japan

Abstract

We collected various data from the active fault map of the urban area (Geographical Survey Institute) and long-terme valuation for active faults (Headquarters for Earthquake Research Promotion), and investigated a survey of 334 land uses on flexure zones throughout Japan. Regarding to the slope of the flexure zone, residential and commercial buildings that occupied 28% at 0◦ ≦ slope < 5◦decreased to 9% at 20◦ ≦ slope < 25◦, also the forest that occupied 11 ％ at40◦ ≦ slope < 5◦increased to 68% at 20◦ ≦ slope < 25◦. The characteristics of land use changed in slope. Analyzing the trends in each region, Hokkaido, Tohoku, and Chubu regions are known that larger than other regions for agricultural production, and the same tendency appears in land use on flexible zones. 37%, 41%, and 43% were used as agricultural land in these areas. On the other hand, the Kanto and Kinki region that have cities with concentrated populations occupied 59%, 61% at residential and commercial buildings and public buildings. Focusing on the flexure zone located in the ordinance-designated city, 70% of the land on the flexure zone was used for buildings used by people.