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Ninth International Conference on Permafrost ... - IARC Research

Ninth International Conference on Permafrost ... - IARC Research

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<strong>Permafrost</strong> Delineati<strong>on</strong> Near Fairbanks, Alaska, Using Geophysical TechniquesBeth N. Astley, Allan J. DelaneyCold Regi<strong>on</strong>s <strong>Research</strong> and Engineering Laboratory, Fairbanks AlaskaIntroducti<strong>on</strong>Surface geophysical methods can be used to accuratelyand rapidly map permafrost extent over limited areas and tomeasure changes in permafrost extent and thickness throughtime. We investigated disc<strong>on</strong>tinuous permafrost sites nearFairbanks, Alaska, using electrical resistivity tomography(ERT), ground-penetrating radar (GPR), and electromagneticinducti<strong>on</strong> (EMI). Disc<strong>on</strong>tinuous permafrost in this regi<strong>on</strong>is present to depths as great as 60 m, and the active layerranges from

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