 | The Southern California Integrated GPS Network (SCIGN) is a group of connected GPS receivers which are used to monitor the build-up of strain along the two tectonic plates which are touching in southern California. |
Synthetic Aperture Radars (SAR) produce all-weather, day and night, high quality pictures of the Earth's surface. By combining two or more pictures of the same area, it's possible to make maps that are highly detailed and show useful information about an area. This technique is called SAR interferometry. SAR interferometry has been applied to the study of earthquakes, volcanoes, glacier flow, landslides, and other geologic events. NASA's Role in Investigating Continental Drift
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