Comparing Adjoint Waveform Tomography Models of California Using Different Starting Models

• Published in: Journal of Geophysical Research: Solid Earth
• Main Authors: Doody, C, Rodgers, A, Afanasiev, M, Boehm, C, Krischer, L, Chiang, A, Simmons, N
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: eScholarship, University of California 2023
• Subjects: adjoint tomography; model comparison; California; full waveform inversion; seismic tomography; Geochemistry; Geology; Geophysics; North Atlantic
• Online Access: https://escholarship.org/uc/item/5cq446m8; https://doi.org/10.1029/2023jb026463

Adjoint waveform tomography (AWT) sits at the cutting edge of seismic tomography on local, regional, and global scales. However, the choice in starting model may have a significant impact on the final inversion results. In this paper, we present 3 AWT models of California that are based on different starting models. We chose three models that were inverted at different scales: SPiRaL, a global travel-time tomography model (Simmons etal., 2021, 10.1093/gji/ggab277), CSEM_NA, a regional adjoint tomography model of North America and the North Atlantic (Krischer etal., 2018, 10.1029/2017JB015289), and WUS256, a regional adjoint tomography model of the western US (Rodgers etal., 2022, https://doi.org/10.1029/2022JB024549). We then inverted three AWT models using the same source and receiver set. We ran each model over three period bands: 30–100s, 25–100s, and 20–80s. Once the iterations were finalized, we used five methods of testing model similarity in both the model and data space. We conclude that the choice of starting model has a minimal impact on long wavelength models if an appropriate multi-scale inversion approach is used.