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The earthquake that struck China's Sichuan Province in May 2008 collapsed more than buildings. It also destroyed mountain ridges, sending avalanches of rock down their slopes. Besides directly claiming many lives, these landslides complicated rescue and cleanup efforts in the aftermath of the quake. Two images, acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA's Terra satellite, show changes in the landscape before and after the earthquake that struck on May 12, 2008, and the resulting aftershocks. The region shown is roughly 150 kilometers (90 miles) from the quake's epicenter. The river running through the image is Min Jiang. In these false-color images, red indicates vegetation; blue-gray indicates bare ground, buildings, and paved areas; and deep blue indicates water. Some differences between the images result from the seasons in which they were acquired. In the February 19, 2003, image (image #) the terrain seems more rugged because the...