← Back to Sessions

Validating Tomographic Models of Alaska Using 3D Wavefield Simulations

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, inspiring a wave of interest in the seismic structure of Alaska. Seismologists have utilized ambient noise waveforms as well as body waves, surface waves, and arrival time data from local earthquakes to produce several tomographic models that characterize the elastic structure (Vp, Vs) of the region, and several of these models have been archived at the EarthScope IRIS EMC for others to utilize. We have chosen five of these models of Alaska to compare and contrast their utility for wavefield simulations and for generating Green’s functions for moment tensor inversions. We present synthetic waveforms made in the software package SPECFEM3D_Globe in comparison with recorded waveforms for a selected earthquake in Alaska. We then use the Python-based package MTUQ to perform moment tensor inversions using Green’s functions generated in each of the five models. This testing will allow us 1) to investigate the effects of 3D structure on moment tensor inversions and 2) to carefully choose the best starting model for a future adjoint tomography study in Alaska.

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: Amanda

Student Presenter: Yes

Invited Presentation: 

Authors