| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 90 === Abstract
An earthquake of magnitude 7.3 on Richter scale occurred in middle region of Taiwan on 21, September, 1999. This earthquake caused more than two thousand people died, severe property loss, and a large number of landslides. A large number of landslide data and Chi-Chi earthquake strong motion records were obtained.
This research collects data of landslides triggered by Chi-Chi earthquake, and the Taiwan where a large number of landslides occurred in mid-region was selected for research region. This research consults the factors which considered by other scholars for the study of landslide. Ten factors for this research including elevation, aspect, slope, d-fault, d-epicenter, d-road, d-river, geology, PGA-V and Arias Intensity was used. With the powerful data-processing function and spatial analysis ability of Geographic Information System(GIS), date of the variation-point determined by ITRI, the basic data of research region, and Chi-Chi earthquake strong motion records, were processed to establish the landslide database.
For the analysis model, this research used dangerous value method to deal with each factor, divided each factor into several parts, and quantified each factor, and analyzed the relationship between factors with landslide ratio, established the weighting of the factors, finally the estimating model was established based on dangerous value method. Considering on the relationship among on factors, it was treated with multi-variable analysis for the influence on landslide triggered by earthquake.
With the analysis results, we use dangerous value of 3.0 and 4.5, the research region was divided into low, moderate, high for the suspenseful potential region. Verification of aerial photograph proofed, the result to be good. So the analysis method which mentioned by this research is suitable for the forecast of risk assessment of landslide hazard triggered by earthquake.
Keyword：Geographic Information System, dangerous value method, landslide ratio
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