Proposition de projet d`initiation à la recherche

M2 : Génie Civil
Géo-mécanique : Ouvrages, Eau, Réservoirs (GEO2)
Année 2016-2017
Proposition de projet d’initiation à la recherche
Title : Influence of fault heterogeneity on the frequency content of seismic
waves
Description:
Understanding the wave shape and frequency content of seismic waves is important to design
appropriate earthquake-resistant buildings. The non-linear rupture process as well as the propagation
path both influence the frequency content but it is difficult to separate their effect on the resulting
seismic wave at the surface. Although it is well known that the high density of small fractures in the
rock surrounding the fault makes the area extremely heterogeneous, the influence of this
heterogeneity has been rather disregarded. In particular, it is expected that localization (in the sense
of Anderson) of high-frequency waves around the fault may influence to a large extent the frequency
content of seismic waves at the surface.
This projects aims at conducting a literature review on the influence on the frequency content of
seismic waves of these three phenomena: (I) non-linear rupture process, (ii) propagation path, and
(iii) heterogeneity in the vicinity of the fault. As it is the less studied, a particular emphasis will be put
on the last item.
Keywords : Geophysics, Wave propagation in heterogeneous media, Seismic faults
Some starting references:
G. Hillers, M. Campillo, Y. Ben-Zion, P. Roux (2014). Seismic fault zone trapped noise. Journal of
Geophysical Research: Solid Earth, 119 (7), 5786-5799.
H. Igel, G. Jahnke, Y. Ben-Zion (2002). Numerical simulation of fault zone guided waves: accuracy
and 3-D effects. Pure and Applied Geophysics, 159, 2067-2083.
E. Larose, L. Margerin, B. A. van Tiggelen, M. Campillo (2004). Weak localization of seismic waves.
Physical Review Letters, 93 (4), 048501.
H. Sato, M. C. Fehler, T. Maeda (2012). Seismic wave propagation and scattering in the
heterogeneous earth. Springer.
Laboratoire / entreprise : MSSMat, CentraleSupélec
Responsable, co-encadrant éventuel :
Régis Cottereau, [email protected]