This pair of false-color images (top) from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), flying aboard NASA’s Terra satellite, shows mountain Kazbek in Southern Russia before and after the collapse of the Kolka Glacier in 2002. On September 20, a collapse of a hanging glacier from the slope of mountain Dzhimarai-Khokh onto the Kolka Glacier triggered an avalanche of ice and debris that went over the Maili Glacier terminus then slid more than 15 miles (24 km). The top right scene was acquired on October 3, 2001, and the top left scene was acquired on September 27, 2002. The long, dark grey streak running upward through the center of the scene shows the gorge that was overrun by ice and debris from the avalanche. The deep reds show vegetated land surfaces, grey areas are bare rock, and white shows ice-covered lands.
The scene shows the location of the landslide relative to distinguishing features in the larger region. Data from the NASA/GSFC/MITI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team.