Comparing Adjoint Waveform Tomography Models of California Using Different Starting Models

Doody, C.; Rodgers, A.; Afanasiev, M.; Boehm, C.; Krischer, L.; Chiang, A.; Simmons, N.

doi:10.1029/2023JB026463

Comparing Adjoint Waveform Tomography Models of California Using Different Starting Models

Journal Article · Sun May 14 00:00:00 EDT 2023 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1029/2023JB026463· OSTI ID:1973537

^[1]; ^[2]; Afanasiev, M. ^[3]; Boehm, C. ^[3]; ^[3]; ^[2]; Simmons, N. ^[2]

Berkeley Seismology Laboratory University of California Berkeley Berkeley CA USA, Lawrence Livermore National Laboratory Geophysical Monitoring Program Livermore CA USA
Lawrence Livermore National Laboratory Geophysical Monitoring Program Livermore CA USA
Mondaic Ltd. Zurich Switzerland

Abstract

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 et al., 2021, 10.1093/gji/ggab277 ), CSEM_NA, a regional adjoint tomography model of North America and the North Atlantic (Krischer et al., 2018, 10.1029/2017JB015289 ), and WUS256, a regional adjoint tomography model of the western US (Rodgers et al., 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: 30–100 s, 25–100 s, and 20–80 s. 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.

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Sponsoring Organization:: USDOE

OSTI ID:: 1973537

Alternate ID(s):: OSTI ID: 2008174
OSTI ID: 1975439

Journal Information:: Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 5 Vol. 128; ISSN 2169-9313

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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