Time-exposure photograph of the electronic-laser, ground-motion measurement system in operation at Parkfield, California, to track movement along the San Andreas fault (see text). (Photograph by John Nakata, USGS.)

"Plate tectonics and people"

URL: http://pubs.usgs.gov/publications/text/ground_motion.html
Last updated: 05.05.99
Contact: jmwatson@usgs.gov