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Authors: Yuan, Yanhua O.
Advisors: Simons, Frederik J.
Contributors: Geosciences Department
Keywords: double-difference
Full waveform inversion
seismic tomography
surface waves
Subjects: Geophysics
Issue Date: 2016
Publisher: Princeton, NJ : Princeton University
Abstract: Convergence and stability of seismic full-waveform adjoint schemes are greatly improved when data and synthetics are progressively presented to the inversion algorithms in a constructive multiscale approximation using a wavelet transform. Surface waves, when properly accounted for, can and do preserve a wealth of near-surface features that would be lost in conventional body-wave tomography. To incorporate surface waves in full-waveform inversion, I use seismic envelopes in the context of wavelet-based multiscale analysis, which lessens the nonlinearity and prevents cycle-skipping problems. Seismic tomography is at risk of mapping source and other systematic uncertainties into estimates of wavespeed variations. To alleviate the corresponding nonuniqueness in the inverse problem, I developed a double-difference method for elastic adjoint tomography that pairs up measurements from the same source recorded at distinct stations. In double-difference tomography even one earthquake is able to resolve significant details of the wavespeed structure, while the computational cost of the necessary adjoint simulations is largely unaffected.
Alternate format: The Mudd Manuscript Library retains one bound copy of each dissertation. Search for these copies in the library's main catalog:
Type of Material: Academic dissertations (Ph.D.)
Language: en
Appears in Collections:Geosciences

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