Methodology for validation of simulated ground motions for seismic response assessment: Application to cybershake source-based ground motions

Jawad Fayaz, Sarah Azar, Mayssa Dabaghi, Farzin Zareian

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A comprehensive methodology for the validation of simulated ground motions is presented. The suggested methodology can be geared toward any ground-motion simulation method and seismic response assessment, in a target engineering application. The methodology is founded on the comparison between conforming groups of ground-motion waveforms from recordings and simulations and their effect on a representative collection of structures that represent the engineering application. The comparison considers the statistics of earthquake scenarios at the level of the event and site parameters, the resulting waveform characteristics, and the subsequent structural responses. Regression models are developed at three levels (between structural responses and waveform characteristics, structural responses and event and site parameters, and waveform characteristics and event and site parameters). Similarities between the models from groups of recorded and simulated ground motions guide the validation process. The validation methodology is applied to CyberShake (v.15.12) simulations and for the estimation of the column drift ratio of a bridge structure. It is shown that CyberShake (v.15.12) can be used to assess the median seismic response of the used bridge. Some discrepancies between simulations and recordings are observed, which could be attributed to the basin and site-response models used for simulations. Further implementation and refinement of the suggested methodology are recommended to make broader conclusions.

Original languageEnglish
Pages (from-to)226-241
Number of pages16
JournalBulletin of the Seismological Society of America
Issue number1
Publication statusPublished - 28 Feb 2021
Externally publishedYes

Bibliographical note

Funding Information:
This study is based on work supported by the Pacific Earthquake Engineering Research Center (PEER) Transportation Research Program under Grant Number 6640-001-0042. This financial support is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this article are those of the authors and do not necessarily reflect the views of sponsors. The authors thankfully acknowledge the valuable technical support from the Southern California Earthquake Center throughout this study.

Publisher Copyright:
© Seismological Society of America.


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