Jianming Yin, RobertL.Nigbor, Qingjun Chen, Jamison Steidl (2016)
Characteristics of rotational earthquake ground motions and their effects on structural response are not yet well-defined. Recording rotational ground motions directly in free field is in its infancy, and simultaneous six-component earthquake measurements are being accumulated slowly. A six-degree-of-freedom (6DOF) ground motion observation system was installed in the Garner Valley Downhole Array (GVDA), a very well-characterized and well-instrumented geotechnical array in Southern California.... Measured rotational motions show differences from estimations using elastic plane wave theory when using simple local apparent wave velocities.Finally, preliminary empirical relationships for rotational response spectra are estimated for earthquake engineering applications.

Ratios of the peak rotational acceleration to peak horizontal acceleration as a function of hypocentral distance and fitted curves for observed earthquake events recorded at GVDA.

X. Wei, M. Miranda, M.E. Rosario, C.J. Costantino, J. Braverman
This report documents the results of a study to determine the depth-dependent V/H ratios of ground motion response spectra in the free field. The V/H ratios reported herein were developed from a worldwide database of surface and downhole acceleration recordings obtained from 45 vertical array stations.

Map of Vertical Array Stations.
OSTI link: http://www.osti.gov/scitech/biblio/1176998

Cox, Brady Ray (2006)
Dissertation presented to the Faculty of the Graduate School of The University of Texas.

Shearing strain and excess pore water pressure time histories obtained from a first-generation in-situ liquefaction test (fromChang, 2002).

Youd, T. L., J. H. Steidl, and R. A. Steller (2007)
Earthquake Geotechnical Engineering, Paper No. 1251, Springer

Photograph of packer (above measuring tape) used to seal pore-pressure transducer (not attached) and cable in piezometer casing;photograph also shows fixtures at top of casing, including concrete pad, stainless steel protective box, piezometer casing,and electrical conduit (small casing through bottom of box).

Steidl, J.H. (2007)
Proceedings of the 4th International Conference on Earthquake Geotechnical Engineering, June 25-28, 2007, Paper No. W1-1009,p.234-245, Aristotle University of Thessaloniki, Greece.

A schematic of the structure constructed at the GVDA site and the different input forces that can be used in response testing.

Ancheta, T., Stewart, J., Abrahamson, N., Nigbor, R. (2007)
eScholarship, University of California


Youd, T.L., H. W. Bartholomew, and J. H. Steidl (2008)
Journal of Geotechnical and Geoenvironmental Engineering, 134, p. 397-400. China, paper S16-01-014

Recorded force (FX) and velocity (VX) time histories from a single hammer drop during Standard Penetration Test (SPT) at 7.4m (24 ft) depth.

Steidl, J. H., R. L. Nigbor, T. L. Youd (2008)
Proceedings of the 14th World Conference on Earthquake Engineering, October 12-17, 2008 Beijing

The RDV tool displays a M4.9 event downloaded using the map-based search tool.These tools allow remote participants in researchexperiments the ability to watch the experiments as they happen.



This site funded by the United States Nuclear Regulatory Commission (NRC)  under Contract# NRC-HQ-60-15-C-0001
Project title: "Observations and Analysis of Geotechnical Array Data"

This site previously funded (2004 to 2014) by the Geoge E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Program of the National Earthquake Hazards Reduction Program (NEHRP) of the National Science Foundation (NSF) under Award Number CMMI-0927178.