The JPL folks used UAVSAR mounted on their Gulfstream-III aircraft to take highly accurate radar measurements of the ground surface in Baja, California, near the site of the April 4, 2010 magnitude 7.2 Baja earthquake that rocked portions of Mexico and the US. This interferrogram imagery is on the U.S. side of the border, and stops about 10-km from the northernmost point of fault rupture. However it does show about 31-inches of downward and southerly ground movement associated with the event. The overall project is surveying the San Andreas fault system from North of San Francisco to the Mexican border every 6-months to allow for detailed measurements of displacements after earthquakes and to observe how different fault systems behave in relation to each other. For a picture of the aircraft, see a previous GeoPrac post. [Source: NASA Jet Propulsion Laboratory via Geoengineer.org. Image: NASA/JPL/USGS/Google]
Related Articles
Devil’s Slide Tunnel, Project Updates and Geotechnical Info
Devil’s Slide is an infamous landslide along California’s Highway 1 or Pacific Coast Highway near Pacifica, just south of the San Francisco Bay area. Caltrans’ Devil’s Slide Tunnel project is an effort to bypass that slide and make the heavily traveled roadway safe for drivers and to eliminate the maintenance and traffic hassles caused by slope failures blocking the road. We first covered the project back in September of 2007 when the tunnel portion of the project commenced. In that post, you can find a Google Earth KML File showing the location of the tunnels and the new bridges associated with the project. In this post, I’ll provide you with some updated progress information as well as some background on the geotechnical and other aspects of the project. More links and videos are at the end of the post. (Photo by Kim Komenich, San Francisco Chronicle). […]