. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. Geophysical Exploration: How Firm a Foundation? On steep, unstable, granitic slopes in central Idaho, locating and designing roads to minimize erosion and sediment production is extremely important. One crucial but largely neglected fac- tor has been subsurface rock properties on these slopes. Underground rocks that have weathered or altered enough to contain sufficient clay can become "plastic" and collapse after a distur- bance such as roaaduilding. Researchers at the
. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. Geophysical Exploration: How Firm a Foundation? On steep, unstable, granitic slopes in central Idaho, locating and designing roads to minimize erosion and sediment production is extremely important. One crucial but largely neglected fac- tor has been subsurface rock properties on these slopes. Underground rocks that have weathered or altered enough to contain sufficient clay can become "plastic" and collapse after a distur- bance such as roaaduilding. Researchers at the Intermountain Station found that a combination of seismic and resistivity surveys can predict zones of weathered rock and provide information about its strength and the subsurface water content. Previously, geophysical surveys using only one tecbnique haa not proved particularly valuable for predicting the degree of rock weathering or zones of subsurface water flow requiring drain- age. By combining the two survey tech- niques, scientists allow the strengths of one to compensate for the weaknesses of the other and improve the interpre- tation of results. These researcn findings cut the cost of road repairs substantially, particularly in areas where engineers have little experience or prior knowledge about subsurface conditions. In addition, engineers can now predict accurately (without preconstruction data) where to locate underground Two geophysical survey techniques can predict the properties of subsurface rocks and cut the costs of road repair. 4. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Forest Service. [Washington, D. C. ?] : USDA, Forest Service
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