Information for Strong-Motion Station
Eureka - 4-story Hospital
CGS - CSMIP Station 89770
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 40.7840 N
Longitude 124.1423 W
Elevation (m) 34
Site Geology  
Vs30 (m/sec)  
Site Class  
No. of Stories above/below ground4/1
Plan ShapeRectangular
Base Dimensions73' x 138'
Typical Floor DimensionsRectangular 73' x 138'
Design Date1978 (OSHPD HO815)
Instrumentation11 accelerometers, on 4 levels in the building. 3 accelerometers at a reference free-field site.
Vertical Load Carrying System12" concrete flat slab supported on 20" square concrete columns and 10" thick shear walls. Columns have 8' square caps 6" thick. Edge beams 10" thick 18" deep support the slab betweeen the perimeter shear walls.
Lateral Force Resisting System10" thick concrete shear walls along the perimeter and inside the building. Shear walls terminate at various levels. 12" thick flat slab serves as the horizontal diaphragm.
Foundation TypeAll building columns (including those at the ends of shear walls) are supported by 4'6" diameter concrete caissons 10' to 46' in depth.
RemarksThis building was instrumented as part of the OSHPD/CSMIP Hospital Instrumentation Project.