Western U.S. Background Velocity Field
![map of California with arrows showing ground movement](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/EQ-processes.jpg?itok=gU95ysRt)
Detailed Description
Relief map of the western United States with the background velocity field (relative to a fixed North American plate) determined from two decades of GPS observations. Measurements have been made by numerous academic and government organizations, including the Plate Boundary Observatory and the USGS.
Sources/Usage
Public Domain.