European Center for Geodynamics and Seismology (ECGS) | Centre Européen de Géodynamique et de Séismologie (CEGS)

98th JLG: European ground motion models from the past to the future

Last updated: 18 November 2016

Thanks to all participants for a highly productive meeting!

The 98th “Journées Luxembourgeoises de Géodynamique” (JLG) took place on 14-16 November 2016 at the Alvisse Parc Hotel in Luxembourg City. The 98th edition focused on the subject of European ground motion models from the past to the future: Lessons learned and new trends and was held as a strongly discussion-based workshop. The 98th JLG were organised by ECGS and Section 2.6 of the German Research Center for Geosciences (GFZ) in Potsdam, Germany.

JLG98 Group Photo

Journées Luxembourgeoises de Géodynamique

Workshop Description

Ground-motion prediction in Europe is a difficult challenge. Indeed, Europe is a complex tectonic puzzle. To image the tectonic map of Europe, we first of all need to match the subduction pieces for the Calabrian and Hellenic arc with those for the oceanic crust in the Mediterranean Sea and for shallow crustal active regions all around the Mediterranean Sea. Moving north towards continental Europe, the map develops matching the pieces for stable continental regions with those for the Baltic shield. In Europe we also have active volcanos and intermediate-depth earthquakes occurring far from plate boundaries. Such a complex tectonic pattern poses several challenges for the seismic hazard assessment that require suitable models for describing the seismic sources and the attenuation effects. From the ground motion point of view, the large spatial variability of the deformation processes reflects in a large variability of the seismic activity rates, making the capturing of ground motion variability in low seismicity areas particularly challenging.

Most existing ground-motion models do not take into account such regional specificities of earthquake or wave-propagation properties. For example, ground-motion models used in engineering seismology are calibrated on global databases that are usually created by mixing data from different regions. Seismological data recorded by local networks show, however, that regional variations of faults, earthquakes and crustal properties are significant. These observations pose significant problems as they show that regionalization of ground-motion models is required. There is little guidance in the literature on how this should be done.

The aim of the 2016 edition of the Journées Luxembourgeoises de Géodynamique is therefore to bring together the experiences on seismic hazard assessment recently gained in the framework of regional and national projects across Europe. The meeting will be laid out as a discussion-driven workshop framed in two sections:


Monday morning

12:30 – 14:00 Lunch

Monday afternoon: Lessons learned & needs

Tuesday morning: Selection, epistemic uncertainties and regionalisation

12:30 – 13:30 Lunch

Tuesday afternoon: Physics based ground motion prediction

18:00 Social evening & meeting dinner

Wednesday morning: Site specific ground motion prediction

12:30 – 13:30 Lunch

Wednesday afternoon: Final discussion, 13:30 – 15:00

For More Information

Please contact:
Ms Corine GALASSI, ECGS secretary
19 rue Josy Welter
L-7256 Walferdange
Grand Duchy of Luxembourg
Tel: +352 33.14.87-1
Fax: +352 33.14.87-88