Project Objectives:  The PEER Lifelines program is sponsoring a series of integrated research projects to calibrate and further develop existing nonlinear geotechnical models for ground response analysis. The global project objectives are:

(1)   To identify the intensity measures and shaking conditions for which the inclusion of ground response calculations of any type in hazard analyses is beneficial,

(2)  To identify conditions where nonlinear analyses provide a tangible benefit relative to equivalent linear analyses, and

(3)  To provide specific recommendations for the implementation of nonlinear models in design practice.

This web site contains data for “calibration sites” that will be used in these projects. Included for each site is the following information: (1) geotechnical data such as stratigraphy, soil types, and small-strain shear wave velocity profiles; (2) strong motion recordings from the site; (3) a reference set of carefully chosen control motions for use as input in ground response analyses; and (4) Modulus reduction and damping curves used in SHAKE analysis for each site.

        *Format of data

Shallow Stiff Soil Sites (Soil Depth < 30 m)                                              Recorded Motions (PGA_rock)

Intermediate Depth Stiff Soil Sites (Soil Depth 45-90 m)

Deep Stiff Soil Sites (Soil Depth > 120 m)

Soft Soil Sites (Soft Soil with Vs < 150 m/s, Thickness > 3m)

    *Modulus reduction and damping curves used in SHAKE analysis for each site

References:

ROSRINE, Resolution Of Site Response Issues from the Northridge Earthquake

Gibbs, J.F., Fumal, T.E., Boore, D.M., and Powers, T.J. (1992). “Seismic velocities and geologic logs from borehole measurements at seven strong motion stations that recorded the 1989 Loma Prieta, California, earthquake,” OFR 92-287, U.S. Geological Survey, Menlo Park, CA.

Powers, T.J. and Fumal, T.E. (1993). “Geologic logs from 25 boreholes near strong motion accelerographs that recorded the 1989 Loma Prieta, California, earthquake,” OFR 93-502, U.S. Geological Survey, Menlo Park, CA.

Gibbs, J.F., Fumal, T.E., and Powers, T.J. (1994). "Seismic velocities and geologic logs from borehole measurements at eight strong motion stations that recorded the 1989 Loma Prieta, California, earthquake,” OFR 94-222, U.S. Geological Survey, Menlo Park, CA.

Nigbor, R.L. and Steller, R.A. (1993). “Borehole geophysical measurements at 24 rock and soil sites,” Report to EPRI, Rep#9225-6427 Agbabian Assoc., March.

Dickenson, S.E. (1994). “The dynamic response of soft and deep cohesive soils during the Loma Prieta earthquake of October 17, 1989,” Ph.D. Dissertation, Univ. of California, Berkeley.

Abrahamson, N.A. and Silva, W.L. (1997). "Empirical response spectral attenuation relations for shallow crustal earthquakes," Seism. Research Letters, 68(1), 94-127

Gibbs, J.F., Tinsley, J.C., Boore, D.M., and Joyner, W.B. (1999). "Seismic velocities and geological conditions at twelve sites subjected to strong ground motion in the 1994 Northridge, California, earthquake: A revision of OFR 96-740" OFR 99-446, U.S. Geological Survey, Menlo Park, CA.

Gibbs, J.F., Tinsley, J.C., Boore, D.M., and Joyner, W.B. (2000). "Borehole velocity measurements and geological conditions at thirteen sites in the Los Angeles, California region," OFR 00-470, U.S. Geological Survey, Menlo Park, CA.