NEHRP Clearinghouse

Assessment of Site Response Analysis Procedures.
Idriss, I. M.
National Inst. of Standards and Technology (BFRL), Gaithersburg, MD., July 1993, 156 p.
The Loma Prieta earthquake occured on October 17, 1989 at 5:04 pm Pacific daylight time along a 45-km long segment of the San Andreas fault in the Santa Cruz Mountains. The earthquake triggered by far the largest number of instruments ever triggered by an earthquake and recordings were obtained at well over 200 locations, including free-field stations, small buildings, high rise structures and dams. The records obtained from the free-field stations are summarized in Appendix A of this report. These include 31 stations at rock sites, nine stations at soft soil sites and 48 stations at other soils sites. The results of subsurface investigations at Treasure Island site and at the San Francisco Airport site were used in the study to calculate the horizontal components of site reponse at these two sites and to assess the procedures used for conducting such response calculations.
Seismic response; San Francisco (California); Soil-structure interactions; Yerba Buena Island; Site characterization; Soil dynamics; Seismic velocity; San Francisco Airport; Soil mechanics; Shear strain; Ground motion; Treasure Island Naval Station; Loma Prieta Earthquake; Seismic effects; Spectrum analysis; Shear waves; California; Subsurface investigations; Seismic waves; Seismographs; Shear stress; Accelerometers; Seismological station