| Title |
Development of Korean Peninsula VS30 Map Based on Proxy Using Linear Regression Analysis |
| Authors |
최인혁(Choi, Inhyeok) ; 유병호(Yoo, Byeongho) ; 곽동엽(Kwak, Dongyoup) |
| DOI |
https://doi.org/10.12652/Ksce.2022.42.1.0035 |
| Keywords |
진도서비스; VS30; 프락시; 일반선형회귀분석; VS30지도 Seismic intensity service; VS30; Proxy; Linear regression analysis; VS30 map |
| Abstract |
The VS30 map is used as a key variable for site amplification in the ShakeMap, which predicts ground motion at any site. However, no VS30 map considering Korean geology and geomorphology has been developed yet. To develop a proxy-based VS30 map, we used 1,101 VS profiles obtained from a geophysical survey and collected proxy layers of geological and topographical information for the Korean Peninsula. Then, VS30 prediction models were developed using linear regression analysis for each geological age considering the distribution of VS30. As a result, models depending on geomorphology were suggested per each geologic group, including Quaternary, Fill, Ocean, Mesozoic group and Precambrian. Resolution of map is doubled from that of VS30 map by U.S. Geological Survey (USGS).
Standard deviation of residual in natural log of proxy-based VS30 map is 0.233, whereas standard deviation of slope-based USGS VS30 map is 0.387. Therefore, the proxy-based VS30 map developed in this study is expected to have less uncertainty and to contribute to predicting more accurately the ground motion amplitude. |