Seismic Evaluation Causative Fault Study, Missouri River, Oahe Dam - Lake Oahe, South Dakota.
CORPS OF ENGINEERS OMAHA NE
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The present study was conducted to determine if an earthquake producing fault causative fault, capable of generating a damaging earthquake in the vicinity of Oahe Dam, could be identified. Although South Dakota has exhibited a relatively low level of seismic activity, the proximity of the 31 December 1961 Pierre earthquake prompts a detailed study. This study consists of a A review of existing literature, b a remote sensing lineament study, and c field investigation. Existing literature includes published reports, geologic maps, lineament analyses and geophysical data. The present lineament study includes an examination of standard aerial photo index sheets, high altitude photography and Landsat imagery, and the preparation of a linear-feature map. A detailed study area having a 100-mile radius from Oahe Dam was selected. Much of the data studied extends beyond this area. Some detailed data, such as geologic maps and high altitude photography, did not completely cover the 100-mile radius about the dam.
- Geology, Geochemistry and Mineralogy