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Validity domain of the Born approximation for seismic waveform modelling in realistic 3-D Earth structure

Parisi, L; Ferreira, AMG; Capdeville, Y; (2015) Validity domain of the Born approximation for seismic waveform modelling in realistic 3-D Earth structure. Geophysical Journal International , 200 (2) pp. 910-916. 10.1093/gji/ggu446. Green open access

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Abstract

While the first-order Born approximation is increasingly being used in many seismic tomography efforts, its domain of validity to forward model seismic waveforms has not been quantified in the context of current 3-D earth models yet. We here address this issue by comparing teleseismic synthetic surface waveforms calculated using the Born approximation with spectral element method solutions for a variety of realistic global 3-D earth models. We find that the Born approximation has a very limited domain of validity when applied to seismic waveforms. Specifically, it can only accurately model the phase (amplitude) of surface waveforms for source–receiver paths leading to time shifts smaller than about 15 per cent (5 per cent) of the wave period considered. These conditions usually occur in earth models as S20RTS or S40RTS combined with a homogeneous crust for periods longer than T ∼ 80–90 s. For models with stronger heterogeneity and/or realistic 3-D crustal structure, only the phase of waveforms with periods longer than ∼120–130 s can be accurately modelled with the Born approximation.

Type: Article
Title: Validity domain of the Born approximation for seismic waveform modelling in realistic 3-D Earth structure
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/gji/ggu446
Publisher version: http://doi.org/10.1093/gji/ggu446
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Surface waves and free oscillations, Seismic tomography, Theoretical seismology, Wave scattering and diffraction, Wave propagation
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1461431
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