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Complex finite faulting source processes have important consequences for near source ground motions. Using 3D kinematic numerical modeling codes we simulate an ensemble of planar and listric faults (curved faults in which dip decreases with depth) with a variety of source parametrisations and discover that listricity causes systematic changes in ground motions, making it an important factor when estimating seismic hazard in the near field region.
We develop methods to generate complete broadband ground-motions (i.e. time histories of seismic shaking at the Earth surface) for earthquake engineering applications. The term "broadband" here refers to the frequency range of interest for earthquake engineering, and covers frequencies from 0 Hz (static ground displacement) up to ~10 Hz (to which stiff structures are sensitive to).
While the Earth, to first order, can be described as a stratified layered medium, it does contain considerable lateral variations in seismic wave speeds. In particular the Earth' upper layers (crust and upper mantle) contain heterogeneities at all scales that lead to intricate wave propagation effects and seismic scattering. Our interests are focused on modeling the Earth crust as a random field to study seismic scattering, the generation and properties of coda waves, and how seismic scattering affects near-source ground motions and their variability.