Information for Strong-Motion Station
San Francisco - 4-story Office Bldg
CGS - CSMIP Station 58197
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 37.7885 N
Longitude 122.3900 W
Elevation (m) 5
Site Geology Shallow alluvium over rock
Vs30 (m/sec) 1530 (measured)
Site Class B
Remarks/Notes Site information sources
No. of Stories above/below ground4/1
Plan ShapeRectangular
Base Dimensions144 x 275 ft (63.4 x 89.9 m)
Typical Floor Dimensions144 x 275 ft (63.4 x 89.9 m)
Design Date1946 & 2000 (retrofit)
Instrumentation2002. 18 accelerometers, on 5 levels in the building.
Vertical Load Carrying SystemConcrete flat slabs and conrete columns supported on friction pednulum system isolators.
Lateral Force Resisting SystemNon-ductile concrete perimeter wall frames in both directions. In the seismic upgrade, concrete shear walls were added and 98 friction pendulum system isolators were inserted at each column below the Level 1 slab.
Foundation TypeConcrete spread footings.