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• W2321801701 abstract "We present a method for high-resolution imaging of lithospheric structures based on full waveform inversion of teleseismic waveforms. We model the propagation of seismic waves using our recently developed direct solution method/spectral-element method hybrid technique, which allows us to simulate the propagation of short-period teleseismic waves through a regional 3-D model. We implement an iterative quasi-Newton method based upon the L-BFGS algorithm, where the gradient of the misfit function is computed using the adjoint-state method. Compared to gradient or conjugate-gradient methods, the L-BFGS algorithm has a much faster convergence rate. We illustrate the potential of this method on a synthetic test case that consists of a crustal model with a crustal discontinuity at 25 km depth and a sharp Moho jump. This model contains short- and long-wavelength heterogeneities along the lateral and vertical directions. The iterative inversion starts from a smooth 1-D model derived from the IASP91 reference Earth model. We invert both radial and vertical component waveforms, starting from long-period signals filtered at 10 s and gradually decreasing the cut-off period down to 1.25 s. This multiscale algorithm quickly converges towards a model that is very close to the true model, in contrast to inversions involving short-period waveforms only, which always get trapped into a local minimum of the cost function." @default.
• W2321801701 created "2016-06-24" @default.
• W2321801701 creator A5001988181 @default.
• W2321801701 creator A5054389087 @default.
• W2321801701 creator A5069103273 @default.
• W2321801701 creator A5076579254 @default.
• W2321801701 date "2015-05-29" @default.
• W2321801701 modified "2023-10-04" @default.
• W2321801701 title "Three-dimensional full waveform inversion of short-period teleseismic wavefields based upon the SEM–DSM hybrid method" @default.
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• W2321801701 doi "https://doi.org/10.1093/gji/ggv189" @default.
• W2321801701 hasPublicationYear "2015" @default.
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