Information for Strong-Motion Station
San Francisco - Golden Gate Bridge
CGS - CSMIP Station 58700
Earthquakes recorded by this station
Ambient Records for CE58700
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 37.8198 N
Longitude 122.4788 W
Elevation (m) --
Site Geology  
Vs30 (m/sec)  
Site Class  
No. of Spans14. (1 Main span, 2 side spans, 6 spans at the North Viaduct, 5 spans at the South Viaduct).
Plan ShapeMostly straight with a curve at the South Viaduct.
Total Length9151' (2789.2m). Main bridge spans are 1125' (342.9m), 4200' (1280.2m), and 1125' (342.9m). North viaduct spans are approx. 200' (61.0m) with a 347' (105.8m) anchorage housing. South viaduct spans range from 71' (21.6m) to 320' (97.5m).
Width of Deck87.1' (26.5m) to 90' (27.4m).
Construction Date1937 (several upgrades since 1937).
Instrumentation1995. 69 accelerometers and 4 relative displacement sensors on the bridge, and a free-field station on the south side of the bridge. As of 2008, 100 accelerometers and 12 relative displacement sensors on the bridge, and geotechnical arrays on the north side and south side of the bridge.
Superstructure TypeMain span and side spans: suspended steel truss spans supported by braced steel towers. North and South Viaducts are mainly steel truss spans, with a steel arch span at the South Viaduct, supported by steel towers.
Substructure TypeSuspension spans: braced steel cellular shaft towers. 2 columns per tower. North and South Viaducts: braced steel towers and concrete pylons.
Foundation TypeReinforced concrete piers support the main span towers.
RemarksThe bridge was instrumented under the agreement between the Golden Gate Bridge, Highway and Transportation District and DOC.