GPS monitoring of the Jiaju landslide in Danba, Sichuan

The GPS monitoring has been conducted on the Jiaju landslide in Danba, Sichuan. The Jiaju landslide may be separated into the northern and southern parts. In the northern part of the landslide, the horizontal displacement velocities range from 53 mm/a to 200 mm/a, and vertical displacement velocities range from-3 mm/a to-21 mm/a. In the southern part of the landslide, the horizontal displacement velocities range from 12 mm/a to 36 mm/a, and vertical displacement velocities range from-1 mm/a to-5 mm/a. By and large, the GPS measurements of horizontal displacement are better than those of vertical displacement. Furthermore, the mm-sized precision of GPS monitoring may be sufficient enough to be used in the landslide surveys.