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  • These features have been studied since 1981, and since 1982 sorted circles at six patterned ground sites in High Valley have been monitored to determine their degree of activity.
  • zone (Seppälä 1988). This distinction is thought to be necessary because research activities in the high Arctic regions are continuously increasing and there is confusion if all frozen peat mounds are described as palsas.
  • Displacements were monitored at 132 points using plastic inclinometer tubes, wooden dowel pillars and painted stones. Most of the activity was confined to the upper 30 cm of soil, where the rate of surface movement ranged from zero to 1.1 cm/year