Sam Johnson explaining details of a fault zone
![A man, standing at a table and talking, gestures to maps laying on the table.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/maps0611-sm-07.jpg?itok=lBZ_6H2V)
Detailed Description
Geophysicist Sam Johnson explaining details of the San Andreas fault zone at USGS offices in Santa Cruz.
Sources/Usage
Photo courtesy of Santiago Mejia, special to the San Francisco Chronicle.