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Reconstruction of the Volcanic Lake in Hanon Volcano Using the Spatial Statistical Techniques  

Choi Kwang-Hee (Landscape and Ecology Division, National Institute of Environmental Research)
Yoon Kwang-Sung (Landscape and Ecology Division, National Institute of Environmental Research)
Kim Jong-Wook (Department of Geography Education, Seoul National University)
Publication Information
Journal of the Korean Geographical Society / v.41, no.4, 2006 , pp. 391-403 More about this Journal
Abstract
The Hanon volcano located in the southern pan of Cheju Island, Korea has a wetland in its crater being used as a farmland. Previous researchers presumed this wetland was a maar lake in the past. Based on the seismic refraction method, the wetland sediment layer was estimated between 5 to 14 m deep, which is mostly in accordance with previous researches. However, this shows only the depths at some sites, not representing the whole spatial distribution. This study is an attempt to reconstruct the volcanic lake in Hanon crater by applying the spatial statistical techniques based on the depth information from the seismic survey and known data. The procedure of reconstruction is as follows: First, the depth information from the seismic survey and known data were collected and it was interpolated by IDW and Ordinary Kriging method. Next, with the interpolation map and the present DEM the paleo DEM was constructed. Finally, using the paleo lake level on core data, the boundary of volcanic lake was extracted from the paleo DEM. The reconstructed lake resembles a half-moon in the north of the central scoria cone. It is estimated that the lake was 5 m deep on average and 13 m deep at the deepest point. Although there are slight differences according to the interpolation techniques, it is calculated that the area of the lake was between 184,000 and $190000m^2,$ and its volume approximately $869,760m^3$. Because of the continuous deposition processes after the crater formation, the reconstructed volcanic lake would not indicate an actual lake at a specific time. Nevertheless, it offers a significant clue regarding the inner morphology and evolution of the crater.
Keywords
Hanon crater; tuff ring; maar; refraction seismics; IDW; kriging;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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