Information for Strong-Motion Station
San Francisco - 47-story Office Bldg
CGS - CSMIP Station 58532
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 37.7954 N
Longitude 122.3960 W
Elevation (m) 3
Site Geology Deep alluvium
Vs30 (m/sec) - -
Site Class E
Remarks/Notes Site information sources
No. of Stories above/below ground47/2
Plan ShapeRectangular
Base Dimensions180' x 122'
Typical Floor DimensionsSame as base dimensions
Design Date1978
Instrumentation1987. 18 accelerometers, on 7 levels in the building.
Vertical Load Carrying System2.5" concrete over metal deck supported by steel frames.
Lateral Force Resisting SystemMoment resisting steel frame in both directions and eccentrically braced in only the transverse direction (center two bays).
Foundation Type5' thick reinforced concrete mat supported by composite concrete and steel piles (about 200' long).
RemarksThere is a three-story RC building adjacent to the high-rise tower and both are separated by a 2" seismic joint.