Mexico quake damage
When an earthquake struck northern Baja California this spring, it made its place in history (it was the largest recorded earthquake in the area since 1892) and left its mark on the surrounding landscape.
The April 4 quake, which was centered about 40 miles south of the Mexico-U.S. border, measured a 7.2 magnitude. NASA on Wednesday released a few radar images that show some of the disruption the earthquake caused to the Earth's surface in the region.
Scientists at the space agency's Jet Propulsion Laboratory used a system they call Uninhabited Aerial Vehicle Synthetic Aperture Radar (or UAVSAR, for short) to evaluate surface deformation. The radar flies on an aircraft 41,000 feet above the earth and measures the slight differences in distance between the aircraft and the ground over multiple flights, NASA said. By comparing data from flights in 2009 with that from post-quake flights, the JPL team was able to get an idea of how the landscape changed.
This image shows some of the affected area, with NASA data laid over an image from Google Earth. The red lines show major fault lines, while the red, orange, and yellow dots show the locations of aftershocks. The smooth, contoured streaks of color show gradual changes in the landscape. The more jagged, pixelated sections indicate more sudden changes in those measured distances between land and aircraft (read: places that were ripped apart by the earthquake).
June 23, 2010 8:17 PM PDT
Photo by: NASA/JPL/USGS/Google
| Caption by: Jennifer Guevin
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