Geology Reference
In-Depth Information
Figure 5.1.
Permafrost. (A) Typical ground-thermal regime indicating maximum and minimum temperatures, the decrease in temperature with depth,
the geothermal gradient, the depth of zero-annual amplitude, and the depth of seasonal thaw (the active layer). From: ACGR (1988). (B) The relationship
between permafrost, the permafrost table, the active layer, and supra-, sub-, and intra-permafrost taliks. From Ferrians et al. (1969), courtesy of the
United States Geological Survey.
