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Theses in progress

# 3D rupture dynamics on complex fault geometries to investigate surface rupture hazard and near fault ground motions

Host laboratory: ​​Seismic Risk Assessment Section (BERSSIN)

Beginning of the thesis: October 2018

Student name: Rihab SASSI

Subject description

Surface rupture after major earthquakes is highly variable and complex. It represents a threat to infrastructures built in the immediate proximity of active faults. The evaluation of the seismic hazard for a site located near a fault must therefore include an assessment of the risk of surface rupture. The seismic hazard assessment is mainly based on empirical models that neglect the role of the seismic source. In this work, we propose to study the physical characteristics of the source for the evaluation of surface failure. The introduction of physics-based models in seismic hazard assessment methods could eventually reduce the uncertainties associated with the estimation of seismic risk in the vicinity of faults.

The complexity of the surface rupture after an earthquake is due to several parameters of the physics of the rupture, such as the geometry of the fault, the process of the rupture, the properties of the environment, etc. The complexity of the surface rupture after an earthquake is due to several parameters of the physics of the rupture, such as the geometry of the fault, the process of the rupture, the properties of the environment, etc. The complexity of the surface rupture after an earthquake is due to several parameters of the physics of the rupture, such as the geometry of the fault, the process of the rupture, the properties of the environment, etc. In this study, we propose to reproduce the surface fracture characteristics through numerical modeling of the dynamic rupture. The numerical tool is a half-space spontaneous fault rupture calculation code based on the boundary element method.

We use the deformations and surface fractures of the 2013 Baluchistan earthquake obtained by optical correlation of satellite images to compare our computational results with observations. In a first step, we have studied the propagation of the rupture on an inclined fault with dip change near the surface, with or without secondary faults, through a 2D modeling of the rupture. The next step will be the 3D modelling of the Baluchistan earthquake in order to study the impact of the fracture history and the variation of the dynamic stress on the surface fracture models.

Involved IRSN laboratory

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