This time-lapse movie shows 2.5 years of movement of the Swift Creek landslide on Sumas Mountain in northwest Washington. Swift Creek landslide is a 0.5 x 1.5 km slump/earthflow. The view in the movie is the unvegetated bottom 300 m. The landslide is rooted in sheared serpentine. The main mass moves 4-5 m/year (notice the large blocks move slightly relative to the trees in the background). The very apparent shallow sliding on the unvegetated toe sheds a large volume of serpentine sediment into Swift Creek.
Having difficulty viewing the video? Download the video Swift Creek Full Res High Quality.mp4