CESMD

Information for Strong-Motion Station

Half Moon Bay - Hwy 1/Tunitas Cr. Bridge

CGS - CSMIP Station 58754

Earthquakes recorded by this station

 

(Station Photograph - click to enlarge)	(Sensor Layout - click to see PDF File)

   

Latitude	37.3574 N
Longitude	122.397 W
Elevation (m)	16
Site Geology	Alluvium over soft rock (siltstone)
Vs30 (m/sec)	--
Site Class	-

 

No. of Spans	6
Plan Shape	Curved with skew.
Total Length	34' (10.4m)
Width of Deck	34' (10.4m)
Construction Date	1962
Instrumentation	1997. 6 accelerometers on the bridge. 3 accelerometers at a free-field site.

 

Superstructure Type	Prestressed concrete I-girders. Diaphragm abutments.
Substructure Type	Rectangular concrete columns (retrofitted with steel jackets). 1 column per bent.
Foundation Type	The taller bents (Bents 3 and 4) are on spread footings. Other bents and abutments are on steel piles.
Remarks	This bridge was instrumented under the interagency agreement between Caltrans and DOC. The bridge was retrofitted in 1994.