This west pit time-lapse image was taken on February 19 at 6:20 am showing changes in the area since the previous image (taken on January 31). On February 10 at 8:21 am (exact time based on seismic data) a large portion of the northeastern rim of the west pit (right side of glowing pit), collapsed. Prior to and during the rim collapse, the adjacent ground also subsided. Photo taken Friday, February 23, 2018 courtesy of U.S. Geological Survey