Photo of Erik Ronald with NA-3000. Frank Spada and bar code rod.
Undergraduate geology major Erik Ronald with the Leitz NA-3000 digital level on Ventura Avenue.  The instrument emits an infrared beam that scans two bar-coded, 3 m-long, strut-supported invar leveling rods and determines the height difference between them to plus/minus 0.1 mm.  The bar-coded leveling rods are shown in an accompanying photograph.  Use of a a brand name here does not imply a product endorsement by the University of California or the National Earthquake Hazard Reduction Program. Copyright © Arthur G. Sylvester, 1997. UCSB Seismotectonic Prognostications, Ltd., crewman, Frank Spada, with strut-supported 3 meter-long, invar, bar-coded leveling rod. Copyright © Arthur G. Sylvester 1997.
One of our three Ashtech Z-12 GPS antennae with black receiver box on the ground beneath the tripod. Attached whip antenna is for radio communcation to a similar base station set up several kilometers away. Photograph taken by Peter Morris, 1997.

Return to the Title Page.

Arthur G. Sylvester
Department of Geological Sciences
University of California
Santa Barbara, CA 93106