Earthquake Disaster Assessment from Space in Urban Area based on the Soil Database
- Paper number
IAC-05-B2.1.01
- Author
Dr. Shinkichi Kishi, Hiroshima Institute of Technology, Japan
- Coauthor
Dr. Yuzo Suga, Hiroshima Institute of Technology, Japan
- Year
2005
- Abstract
bf The authors have been conducting the studies on utilization of earth observation satellite data oriented to hazard mapping for natural disasters such as hazardous earthquake. Mapping of urban land use derived from satellite data is conducted through geographic information system. In general land use of urban area is classified to several categories from muti-spectral satellite data. In the case of using Landsat-7/ETM+ and Envisat-1/ASAR data the ground resolution is about 30 meters.
On the other hand, the author has developed the database of columnar sections of soil in the urban areas. The data of several tens of thousand bore-hole records around Tokyo bay are stored in the computer and now similar database centering around Hiroshima-city area is being developed. The data were produced at the fundamental survey for construction of various structures. The location of boring is given by latitude and longitude determined officially by Geographical Survey Institute of Japan, so that most of the retrieval in utilization of the database are easily conducted according to the location index. In middle Japan the length of 1 second of latitude or longitude is about 30 meters.
Combining these two different kinds of data of underground and of surface respectively through geographic information system, a new method of risk assessment of urban area at the time of hazardous earthquake has been originally developed. For example, it is possible to illustrate the regional distribution of ground condition such as the thickness of soft ground i.e. vibration characteristics and the existence of sand layer with potentiality for liquefaction, where various kinds of land use such as densely built-up area are located. These results of risk assessment are plotted onto the electronic topographic map opened to the public by Geographical Survey Institute according to the coordinates with latitude and longitude. As another way of presentation, the satellite image maps in background are used instead of the ready-made topographic map.
- Abstract document
- Manuscript document
IAC-05-B2.1.01.pdf (🔒 authorized access only).
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