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on 3/21/25 at 9:59 AM
The objective of this “Kappa Workshop on Earthquake Ground Motions on Rock Sites” (held remotely from 25-28 May 2021), organised by the NEA Working Group on Integrity and Ageing of Components and Structures (WGIAGE), was to gather international knowhow and experience on how to analyse high-frequency spectral decay (kappa) using earthquakes recorded preferably at <100 km at seismograph or strong-motion sites, as well as to provide guidance on selecting kappa values for rock sites and their relationship with site characteristics. The results of the current research programmes – namely, by the CNSC and Western University Ontario in Canada, as well as two other major international projects, the PEER/EPRI/UCLA/EDF Kappa project in the United States and the Seismic Ground Motion Assessment project (SIGMA2) led by France – were presented and discussed at the workshop.
The objectives of the workshop were:
• to share results from current research programmes on kappa and site characterisation;
• to discuss existing and new data sets and methodologies;
• to compare results across different regions, especially stable continental ones; and
• to reach a consensus through discussion and to provide conclusions and/or recommendations.
