US Western Assistant Tomography Reproduces Waveform Complexity

Editors’ Highlights are summaries of recent articles written by AGU’s journal editors.
Source: Journal of Geophysical Research: Solid Earth

Although its use is becoming increasingly common, the adjoint tomography method is difficult to implement due to complex workflows, large datasets, visualization difficulties, and computational costs.

Rogers et al. [2022] Effectively exploit the full USArray dataset in retrieving the velocity structure of the US western crust and upper mantle using adjunct tomography. The resulting 3D wavefield simulations of 72 regional earthquakes representing a total of more than 94,000 three-component broadband waveforms display remarkable fidelity to observed seismograms, testifying to the veracity of the recovered structure.

The 3D model of the western United States (WUS256) presented here will likely serve as an important reference in future studies.

Quote: Rodgers, A., Krischer, L., Afanasiev, M., Boehm, C., Doody, C., Chiang, A. & Simmons, N. (2022). WUS256: An adjunct waveform tomography model of the crust and upper mantle of the western United States for enhanced waveform simulations. Journal of Geophysical Research: Solid Earth127, e2022JB024549.

—Michael Bostock, editor, Journal of Geophysical Research: Solid Earth

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Sharon D. Cole