Information for Strong-Motion Station
Seal Beach - 8-story Office Bldg
CGS - CSMIP Station 14578
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 33.7567 N
Longitude 118.0851 W
Elevation (m) 5
Site Geology Alluvium
Vs30 (m/sec) - -
Site Class D
Remarks Site information sources
No. of Stories above/below ground8/1
Plan ShapeRectangular
Base Dimensions244'-6" x 136'-6"
Typical Floor Dimensions244'-6" x 136'-6"
Design Date1966
Instrumentation1989. 22 accelerometers, on 5 levels in the building. 3 accelerometers at a reference free-field site and 6 accelerometers at a nearby ground and downhole site.
Vertical Load Carrying SystemReinforced concrete frames supporting concrete waffle slab floors and roof.
Lateral Force Resisting SystemDistributed moment-resisting non-ductile concrete frame.
Foundation TypeCast in place reinforced concrete piles; 3 feet diameter and about 50 feet long.
RemarksIn 1989 the building was seismically strengthened. Exterior ductile concrete moment frames were added and isolators were installed at the first story.