SEISMOLOS · Ground-motion modelling for seismic hazard assessment in regions with moderate to low seismic activity
FP7 — People (Marie Curie Actions)
- Duration
- 2009-10-31 → 2011-10-30
- EU contribution
- €30,000
- Participants
- 1
- Scheme
- MC-ERG
Lines connect the coordinator with its partners.
Results in brief
Ground-motion modelling for seismic hazard assessment in regions with moderate to low seismic activity
Ground-motion prediction in regions of low-to-moderate seismicity is a difficult task due to the lack of strong ground-motion recordings. Consequently, alternatives to the usual procedure which consists in establishing a ground-motion prediction equation based strong ground motion data have to be found. Such an alternative is stochastic ground-motion modelling. The inputs to stochastic ground-motion modelling are parameters which describe source, propagation and site effects for the region under study. Data from France metropolitan area and French West Indies are analysed in this project in order to provide inputs for future stochastic ground-motion modelling. Homogeneous moment magnitudes catalogues are determined as well as regional attenuation functions. One major finding during the project concerns the scaling of source properties with earthquake size observed for small earthquakes with moment magnitudes lower than 4.5. Additionally, strong-ground motion data from the USA and Japan are analysed in order to better characterise rock site effects, and more specifically the high-frequency attenuation. The results of this project consist of sets of parameters which can be used to model ground-motion using the stochastic simulation method.
Data: CORDIS, © European Union
Project objective
A unified seismic hazard assessment in the Euro-Mediterranean region is currently under progress (European FP7 SHARE project). One of the key step in the procedure of hazard assessment is the use of a Ground-Motion Prediction Equation (GMPE) which allow to estimate the level of shaking accordingly to some seismological parameters (earthquake magnitude, distance from source to site...). Typically these models are determined from the analysis of strong ground-motion records. In regions of low to moderate seismicity, as in Western Central Europe no such specific model exists due to the lack of data from strong events and usually models coming from other regions of the world are used (USA, Japan...). However, high-quality data from small earthquakes now exists for these regions, the analysis of which could provide usefull constraints on source processes, attenuation characteristics and site effects at a regional scale. There is a need of research to understand the non-linear behaviour of some parameters, for instance the classical scaling laws which predicts earthquakes stress drops might not be correct and site effects have been shown to depend on the level of shaking. This research will also help to understand where the large uncertainties in ground-motion modelling come from. The results will serve as input in a procedure know as the host-to-target adjustment in order to adapt existing GMPEs to the regional specificities.
Original text from CORDIS.
Participants
- UNIVERSITE JOSEPH FOURIER GRENOBLE 1 · GRENOBLECoordinatorFrance
Links
Data: CORDIS, © European Union