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Topographic image vividly displays California's famous San Andreas Fault along the southwestern edge of the Mojave Desert. The entire segment of the fault shown in this image last ruptured during the Fort Tejon earthquake of 1857. The San Gabriel Mountains fill the lower left half of the image. At the extreme lower left is Pasadena. High resolution topographic data such as these are used by geologists to study the role of active tectonics in shaping the landscape, and to produce earthquake hazard maps. This image combines two types of data from the SRTM. The image brightness corresponds to the strength of the radar signal reflected from the ground, while colors show the elevation as measured by SRTM. Each cycle of colors (from pink through blue back to pink) represents an equal amount of elevation difference (1300 feet) similar to contour lines on a standard topographic map. The SRTM, launched on February 11, 2000, uses the same radar instrument that comprised the SIR-C/X-SAR that flew twice on the Endeavour in 1994.
