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Room: Tubughnenq’ 4

Date: 5/2/2024

Session Time: 10:30 AM to 11:45 AM (local time)

The engineering seismology community has made a major effort in recent years to develop advanced ground motion models (GMMs). These developments have been facilitated by the availability of very rich earthquake databases made possible by the expansion of seismological networks around the world and open data policies. However, uncertainties in GMMs remain significant and reducing the epistemic uncertainties is currently one of the main challenges in seismic hazard assessment. In empirical GMMs it is often assumed that the earthquakes are recorded at the free surface of the Earth, that the sensor installation conditions and the seasonal effects can be neglected, and that all instruments provide recordings with reliable amplitudes. In practice, many seismic stations are located at depth (e.g., in borehole, in tunnels) or in an urban environment, errors in the metadata can occur, and detailed site characterization and site-effect assessment are performed only on a limited subset of stations. 
 
With this background, this session welcomes contributions highlighting any effects (from station installation conditions to complex site-effects) that could affect the recorded ground motion, with consequent implications for GMMs, especially at high frequency. Topics of interest include data processing and data quality control, instrument coupling, soil-structure interaction, depth effect (down-going waves), seasonal variations, topography effect, site-effects, site characterization, regional and local attenuation, small-scale heterogeneity and scattering. Studies comparing several techniques at the same site and those integrating a variety of datasets are also encouraged. Studies on improving our current practices in earthquake databases and GMMs development, or on the enhanced understanding of the high-frequency content of seismic records are particularly welcome. 

Conveners:
Carlo Cauzzi, ORFEUS, Swiss Seismological Service, ETH Zürich (carlo.cauzzi@sed.ethz.ch)
Fabrice Hollender, CEA Cadarache (fabrice.hollender@cea.fr)
Vincent Perron, CEA Cadarache (vincent.perron@cea.fr)
Zafeiria Roumelioti, University of Patras (zroumelioti@upatras.gr)
Paola Traversa, Electricite de France (paola.traversa@edf.fr)

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