Ground-surface Displacement & Temperature

Ground-surface displacement is monitored by cable extension transducers (displacement meters on the site map). These devices consist of an instrument mounted on a post and an anchor line extending from the instrument to an additional post. The devices measure extension of cable from the instrument. Changes in extension indicate potential ground-surface displacement. However, the anchor lines consist of very fine wire that is suspended about a few meters in the air. Therefore, these wires are susceptible to snow, ice, and wind loads, and damage from wildlife and treefall, which is particularly frequent at this site due to the many dead, standing trees that resulted from the 2002 Missionary Ridge wildfire.