CRACKMETERS
•Twenty automatic crack gauge monitors were installed across several major South Peak fissures
•Measure submillimetre trends including thermal expansion of bedrock
•Installed in sets of three in order to resolve movement vectors
With a maximum range of 50 mm (2 inches), these are very sensitive to movements and have been impacted significantly by snow loading, which typically extends at least four of these instruments beyond their working range each season, leading to replacement.