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The Influence of 3D Velocity Models on Seismic Moment Tensor Estimation in Alaska

Description: 

The EarthScope Transportable Array of seismic stations in Alaska and western Canada peaked in 2017 and has provided excellent data coverage in Alaska and western Canada, leading to a new generation of seismic velocity models, many of which are archived at the EarthScope IRIS EMC. We use five of these models to examine how 3D structures impact the estimation of moment tensors for a set of five representative Alaska earthquakes. We use the software package SPECFEM3D_Globe to generate Green’s function databases for each model, and then use the Python-based package MTUQ to perform moment tensor inversions. Using a set of goodness-of-fit metrics, we quantify the performance of each velocity model, as well as the differences among the estimated moment tensors. The testing will allow us to carefully choose the best starting model for a future adjoint tomography study in Alaska.

Session: Advances in Reliable Earthquake Source Parameter Estimation [Poster]

Type: Poster

Date: 4/16/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Amanda

Student Presenter: Yes

Invited Presentation: 

Poster Number: 31

Authors