Data from in-situ displacement monitoring, Slumgullion landslide, Hinsdale County, Colorado

We monitored displacement of the Slumgullion landslide located in Hinsdale County, Colorado. We measured displacement at the ground surface between 12 August 2011 and 10 October 2018, and in the subsurface between 4 September 2016 and 7 December 2016. Both types of data were acquired at irregular time intervals. Displacement at the ground surface was measured at locations within the upper, middle, and lower parts of the landslide using electronic cable extension transducers (extensometers) with stated ±0.7 mm accuracy (Extensometer_data.csv). Subsurface displacement was measured near the middle of the landslide using a 16-sensor array of 30.48-cm-long tilt sensors (inclinometer) installed within a PVC-cased borehole. Each tilt sensor has stated 0.003 mm displacement resolution and long-term displacement accuracy of ±0.23 mm. Tilt sensor readings are provided (Inclinometer_data.csv) in terms of horizontal position relative to the array bottom. Sensors were oriented so that position values increased in the general direction of landslide movement and decreased in the opposite direction; the tilt sensor array did not penetrate the landslide base so measurements indicate potential differential displacement within the landslide body. Sensors are numbered from 1 to 16 with 1 being the deepest sensor and 16 being the shallowest. The inclinometer was installed within a depth range of 4.93-9.81 m from 4 September 2016 to 17 October 2016 and within a depth range of 0-4.88 m from 19 October 2016 to 7 December 2016. Data from the deeper installation of 4 September 2016 to 17 October 2016 revealed that differential displacement occurred there, with material at shallower depths having moved farther downslope than deeper material. However, data from the shallower installation of 19 October 2016 to 7 December 2016 revealed a general lack of differential displacement with depth, other than relaxation of backfill around the array that permitted tilting of some sensors in the direction opposite the landslide movement direction. These data support a study described in Hu, X., Bürgmann, R., Schulz, W.H., and Fielding, E.J., 2020, Four-dimensional surface motions of the Slumgullion landslide and quantification of hydrometeorological forcing: Nature Communications, v. 11, 2792, doi:10.1038/s41467-020-16617-7.