Information for Strong-Motion Station
San Francisco - 13-story Office Bldg
CGS - CSMIP Station 58336
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 37.7911 N
Longitude 122.3933 W
Elevation (m) --
Site Geology Alluvium
Vs30 (m/sec) - -
Site Class E
Remarks/Notes Site information sources
No. of Stories above/below ground 13/0
Plan Shapesquare
Base Dimensions132 x 132 ft
Typical Floor Dimensions132 x 132 ft
Design Date1978, 2003 (Strengthened)
Instrumentation2008, 18 accelerometers on 7 levels.
Vertical Load Carrying SystemConcrete slabs supported by concrete beams, columns and shear walls.
Lateral Force Resisting SystemPerimeter concrete moment resisting frames and interior concrete shear walls. During seismic strengthening, steel buckling restrained braces were installed on perimeter moment frames of the first three stories.
Foundation TypePile foundation.
RemarksVoluntary seismic strengthening was completed in 2006.