Authors
Dirk‐Philip van Herwaarden, Solvi Thrastarson, Vaclav Hapla, Michael Afanasiev, Jeannot Trampert, Andreas Fichtner
Publication date
2023/6
Journal
Journal of Geophysical Research: Solid Earth
Volume
128
Issue
6
Pages
e2022JB026023
Description
We present a seismic model of the Africa Plate, constructed with the technique of full‐waveform inversion. The purpose of our model is to serve as a foundation for quantitative geodynamic and geochemical interpretation, earthquake‐induced ground motion predictions, and earthquake source inversion. Starting from the first‐generation Collaborative Seismic Earth Model, we invert seismograms filtered to a minimum period of 35 s and compute gradients of the misfit function with respect to the model parameters using the adjoint state method. We use dynamically changing mini‐batches of the complete data set to compute approximate gradients at each iteration. This approach has three significant advantages: (a) it reduces computational costs for model updates and the inversion, (b) it enables the use of larger datasets without increasing iteration costs, and (c) it makes it trivial to assimilate new data since we can …
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Scholar articles
DP van Herwaarden, S Thrastarson, V Hapla… - Journal of Geophysical Research: Solid Earth, 2023