At the request of Stanford University, URS Corporation has updated the seismic hazard evaluation of the campus and revised the campus-wide design ground motions. This study updates a previous study by URS in 2008. Stanford University is located in the... (more)

At the request of Stanford University, URS Corporation has updated the seismic hazard evaluation of the campus and revised the campus-wide design ground motions. This study updates a previous study by URS in 2008. Stanford University is located in the seismically active San Francisco Bay region within the San Andreas fault system. The west side of campus is located about 6 km from the San Andreas fault, which last ruptured in the 1906 moment magnitude (M) 7.9 "Great San Francisco" earthquake.

In the 2008 study, the seismic design ground motions were recognized as being conservative because it was intended to cover a wide range of soil conditions that were not well constrained due to the lack of any site-specific shear-wave velocity (VS) data for the campus. In this study, spectral-analysis-of-surface-waves (SASW) surveys were performed at 15 locations on campus by Professor Kenneth Stokoe and the University of Texas at Austin (UT) and the resulting VS data were used to microzone the campus based on site response analyses and the distance to the San Andreas fault.

An objective of this study was to estimate the levels of ground motions at a specified exceedance probability based upon a probabilistic seismic hazard analysis (PSHA). Deterministic scenario ground motions also were calculated to compare with the probabilistic ground motions. A site response analysis was performed to incorporate the effects of the near-surface geology beneath the campus into the design ground motions. Seismic design ground motions following the standards of ASCE 7-05 Minimum Design Loads for Building and other Structures and ASCE 41-06 Seismic Rehabilitation of Existing Buildings were developed. Specifically, site-specific Design Response Spectra (DRS) following ASCE 7-05 and the recently developed ASCE 7-10, e.g., use of the maximum component and Basic Safety Earthquake (BSE)-1 (10% in 50 years) and BSE-2 (2% in 50 years) spectra consistent with ASCE 41-06 were developed. (hide)

Equipment	Component	Equipment Class	Facility
Urban Shaker (Thumper)	Field Shaker - High Frequency (Thumper)	Field Shaker System	University of Texas at Austin

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