- Author: Robert J Keiffer
The UC Hopland Research & Extension Center is home of one of the many UC Berkeley "seismograph stations" that are scattered around the state. This one at HREC is referred to as HOPS - Hopland CA. Further information about this site can be found at the UC Berkeley Seismological Laboratory website
Associated with the site is a GPS (Global Positioning System) unit that is located about 200 feet above the seismograph. The GPS unit monitors any change in the location (movement) of that unit (North American Tectonic Plate) as compared to the GPS unit located on the Farallon Islands (Pacific Tectonic Plate).
Here you see UCB Seismological Laboratory techs Sarah Snyder and Joshua Miller repairing the worn antennae cable between the GPS unit and the antennae.