Information for Strong-Motion Station
San Rafael - 3-story Office Bldg
CGS - CSMIP Station 68341
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 38.0197 N
Longitude 122.5413 W
Elevation (m) 2
Site Geology Thin fill over rock (sandstone/siltstone)
Vs30 (m/sec) - -
Site Class C
Remarks/Notes Site information sources
No. of Stories above/below ground 3/0
Plan ShapeNearly Rectangular (L-shaped)
Base Dimensions449 x 198 ft
Typical Floor Dimensions449 x 198 ft
Design Date1975, 2012 (retrofit)
Instrumentation1978: 16 accelerometers on 4 levels in the building. 2013: re-installed after retrofit.
Vertical Load Carrying SystemRC waffle slab supported by steel beams (encased in slab) and columns at each level.
Lateral Force Resisting SystemReinforced concrete shear walls and distributed steel moment frames. Retrofit (2013): Addition of new concrete shear walls and thickening of some of the existing concrete shear walls.
Foundation TypeConcrete caissons tied together with grade beams.
RemarksThe 1975 design was based on the 1970 UBC. The 2013 retrofit was designed in accordance with the 2010 CBC. There is a 3-story building adjacent with a 4" seismic joint.