Impact of Ground Motion Modification on Seismic Geotechical and Structural Analyses

Brief description

Ground motion modification is used extensively in seismic engineering practice, especially in cases where recorded ground motions that are consistent with the seismic design scenario are not available. The modification process is typically performed in the time domain or the frequency domain and the frequency content and intensity of a ground motion of a “seed” ground motion is modified so that its response spectrum becomes consistent with a target spectrum. Our study explores the impact of this modification process on the ground motion characteristics of the developed modified ground motion, as well as on the results of geotechnical site response and displacement analyses, as well as structural analyses.



  • Carlson, C., Zekkos, D. (2017) “A Metric to Screen Acceptable Velocity and Displacement Time Histories of Modified Ground Motions”, Earthquake Spectra, (in press).
  • Carlson, C., Zekkos, D., Athanasopoulos-Zekkos, A. (2015) Predictive Equations to Quantify the Impact of Spectral Matching on Ground Motion Characteristics. Earthquake Spectra, 32 (1), 125-142.
  • Carlson, C. P., Zekkos, D. and McCormick, J. P. (2014). “Impact of time and frequency domain ground motion modification on the response of a SDOF system.” Earthquakes and Structures, 7(6), 1283-1301. DOI: 10.12989/eas.2014.7.6.1283
  • Carlson, C., Zekkos, D., Athanasopoulos-Zekkos, A. & Hubler, J. (2014). “Impact of modification on ground motion characteristics and geotechnical seismic analyses for a California site”, Journal or Earthquake Engineering DOI: 10.1080/13632469.2014.898602.
  • Zekkos, D., Carlson, C., Nisar, A. and Guisbert, S. (2012), “Effect of Ground Motion Modification Technique on Seismic Geotechnical Engineering Analyses”, Earthquake Spectra Journal, November 2012, 28 (4), pp. 1643-1662


  • Zekkos, D., Carlson, C. (2011) “Scaling vs. modification of ground motions and impact on seismic analyses of a MSW landfill”, 5th International Conference on Earthquake Geotechnical Engineering, January 10-13 2011, Chile (in cd rom).
  • Guisbert, S., Zekkos, D., and Nisar, A., (2010). “Time vs. Frequency domain ground motion modification: Effects on site response analyses and seismic displacements”, Ninth U.S. National and Tenth Canadian Conference on Earthquake Engineering, Toronto, Canada (paper #1115).

Students Involved


Clinton Carlson


Stephanie Guisbert


Kristina Vaclarek
SURE, Spring-Summer 2012
Jiacheng Li
Independent research and SURE program, Winter 2013 and Spring-Summer 2013.
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