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A Sparse Fault Parametrization for Large-scale Ruptures Based on Moment Tensor Interpolation

Description: 

Modeling and characterizing earthquake sources can be challenging when they fall outside the point-source approximation. Typical finite fault models assume that the rupture surface can be represented as a discretized planar fault or a combination of planes, segmented into discrete patches. This assumption requires committing to a specific fault plane geometry and discretization before performing inversion. To address this limitation, we propose a sparse yet robust fault representation that leverages the geometrical properties of the moment tensor, based on tensor interpolants and procedural surfaces. This approach enables the representation of slip surfaces with a few key point sources rather than an entire discrete surface and dynamically adjusts the discretization density for numerical modeling. We show that spherical linear interpolation is a natural interpolant function for moment tensors and showcase a preliminary application: the interpolant function is used to redistribute point sources from a pre-existing sparse rupture model to obtain a denser fault discretization, which we then use as a smooth source for waveform modeling, demonstrating interest for both the forward and inverse problem.

Session: 3D Wavefield Simulations: From Seismic Imaging to Ground Motion Modelling [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Julien

Student Presenter: No

Invited Presentation: 

Authors