G-GAP project : Seismic hazard in subduction zones

***New perspectives on seismic hazard in subduction zones : Episodic Tremors and Slip, passive monitoring, tectonics and strong motion scenarios

Duration : 2009 - 2013
_ Coordinator :
– M. Campillo, ANR RiskNat accepted in 2008
– A. Walpersdorf, PICS submitted in 2008
ISTerre Research teams involved :
- Seismic cycle and transient deformation
- Waves and Structures
- Risks and environmental geophysics
External collaboration :
- l’IPGP, Paris (F. Brenguier, M. Landes, N. Shapiro, J.-P. Vilotte)
- l’IPGS, Strasbourg (Z. Duputel, L. Rivera)
- l’UNAM, Mexico (D. Kostoglodov, S. Singh, J. Pacheco)

Abstract

Our proposal is centred on fundamental changes of perspective for seismology and seismic hazard evaluation. ETS (Episodic Tremors and slip) is certainly the most important discovery of new phenomenon of the last 50 years in seismology. It is a new and rapidly evolving subject. We propose to study the implications of ETS to the seismic hazard evaluation by putting together the most efficient techniques of analysis in seismology, geodesy and tectonics in a comprehensive study. In the same time we developed new approaches to image and monitor the Earth by using continuous recordings of ambient noise. We will apply these methods to the imaging of the basins responsible of huge site effects in Mexico City. We will evaluate the strong ground motion expected from subduction and shallow earthquake both from a numerical and empirical point of view. (...)

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