Summary of Springhill Landslide Movement and Conditions in 2010
This section summarizes landslide conditions from January 20 through December 7, 2010. Precipitation for the water year is also discussed.
The landslide was active in 2010 and had been continuously moving at a very slow rate since at least January 2008. Measurements indicate that different parts of the landslide were moving at slightly different rates. In general, the landslide moved to the northwest, toward Valley View Drive. Ground deformation measurements were collected from survey markers using a steel measuring tape and a survey-grade GPS instrument, depending on location.
The UGS monitored ground deformation at several locations on the landslide with wooden stakes to estimate approximate movement. At the head or main scarp of the landslide (uppermost part), stretching (points on the ground get farther apart) occurred due to landslide movement. At the toe of the landslide (lowermost part), shortening (points on the ground get closer together) occurred.