On the sensitivity of teleseismic full-waveform inversion to earth parametrization, initial model and acquisition design

Beller, Stephen; Monteiller, Vadim; Combe, Laure; Operto, S.; Nolet, Guust

doi:10.1093/gji/ggx480

Cited by 19 publications

(21 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The resulting source and receiver wave paths are favourable to record both forward and backward scatterings and enrich the horizontal wavenumber coverage in all part of the lithospheric model accordingly. A more thorough sensitivity analysis of teleseismic FWI to the station geometry is presented in Beller et al (2018) and highlights the key contribution of off-line stations to improve both the vertical and horizontal resolution of the teleseismic imaging. To further assess how the resolution evolves with depth, we designed two additional resolution tests with only one 20 km wide fast (ρ, V p , V s ) inclusion located at 50 and 100 km depth, respectively (Figs 9a and b).…”

Section: Resolution and Parameter Cross-talk Appraisalmentioning

confidence: 99%

Lithospheric architecture of the South-Western Alps revealed by multiparameter teleseismic full-waveform inversion

Beller¹,

Monteiller²,

Operto³

et al. 2017

Geophysical Journal International

Self Cite

View full text Add to dashboard Cite

The Western Alps, although being intensively investigated, remains elusive whenit comes to determining its lithospheric structure. New inferences on the latter are important for the understanding of processes and mechanisms of orogeny needed to unravel the dynamic evolution of the Alps. This situation led to the deployment of the CIFALPS temporary experiment, conducted to address the lack of seismological data amenable to high-resolution seismic imaging of the crust and the upper mantle. We perform a 3-D isotropic full-waveform inversion (FWI) of nine teleseismic events recorded by the CIFALPS experiment to infer 3-D models of both density and P-and S-wave velocities of the Alpine lithosphere. Here, by FWI is meant the inversion of the full seismograms including phase and amplitude effects within a time window following the first arrival up to a frequency of 0.2 Hz. We show that the application of the FWI at the lithospheric scale is able to generate images of the lithosphere with unprecedented resolution and can furnish a reliable density model of the upper lithosphere. In the shallowest part of the crust, we retrieve the shape of the fast/dense Ivrea body anomaly and detect the low velocities of the Po and SE France sedimentary basins. The geometry of the Ivrea body as revealed by our density model is consistent with the Bouguer anomaly. A sharp Moho transition is followed from the external part (30 km depth) to the internal part of the Alps (70-80 km depth), giving clear evidence of a continental subduction event during the formation of the Alpine Belt. A low-velocity zone in the lower lithosphere of the S-wave velocity model supports the hypothesis of a slab detachment in the western part of the Alps that is followed by asthenospheric upwelling. The application of FWI to teleseismic data helps to fill the gap of resolution between traditional imaging techniques, and enables integrated interpretations of both upper and lower lithospheric structures.

show abstract

Section: Resolution and Parameter Cross-talk Appraisalmentioning

confidence: 99%

Lithospheric architecture of the South-Western Alps revealed by multiparameter teleseismic full-waveform inversion

Beller¹,

Monteiller²,

Operto³

et al. 2017

Geophysical Journal International

Self Cite

View full text Add to dashboard Cite

show abstract

“…4.f) is poorly retrieved. This is expected from the radiation patterns of a density perturbation, which radiates energy equally in the forward and backward directions (Tarantola 1986;Beller et al 2018a). However, the scattering coefficient is negative, because an increase of wave velocity can be achieved equally well by increasing elastic parameters or decreasing density.…”

Section: Isotropic Inclusion Modelmentioning

confidence: 99%

“…1d). This results from the choice of a velocity parameterization for which the reflections control the density reconstruction (Tarantola 1986;Beller et al 2018a). The overall convergence of FWI is fast: the misfit is reduced to 1 after 32 iterations (Fig.…”

Section: Isotropic Inclusion Modelmentioning

confidence: 99%

“…The choice of keeping the 21 coefficients of the elasticity tensor is appealing as it greatly simplifies the formulation of the inverse problem for arbitrary anisotropy, and leads to a quasi-linear linear inverse problem. However, this raises the question of our ability to resolve the whole 21 elasticity tensor components as in the general triclinic case (Köhn et al 2015), especially with a coarse teleseismic source-receiver acquisition (Beller et al 2018a). To check if our approach would recover a full triclinic tensor, we apply preconditioned anisotropic FWI to the triclinic tensor presented in section 3.3.…”

Section: On Resolution Of Elastic Modulimentioning

confidence: 99%

“…Virieux & Operto 2009). This improved resolution potential stems from the exploitation of the amplitude and phase of the main seismic phases, but also, in the case of lithosphere imaging, from the contribution of later arrivals that are reflected and/or converted on the main seismic interfaces, such as the Moho (Bostock et al 2001;Monteiller et al 2015;Beller et al 2018a). In the last few years, modelling of teleseismic wave propagation in 3D regional models has become tractable, thanks to the development of new hybrid numerical approaches (Roecker et al 2010;Monteiller et al 2013;Tong et al 2014a;Beller et al 2018b).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Probing depth and lateral variations of upper-mantle seismic anisotropy from full-waveform inversion of teleseismic body-waves

Beller

Chevrot

2020

Geophysical Journal International

Self Cite

View full text Add to dashboard Cite

SUMMARY While seismic anisotropy can potentially provide crucial insights into mantle dynamics, 3-D imaging of seismic anisotropy is still a challenging problem. Here, we present an extension of our regional full-waveform inversion method to image seismic anisotropy in the lithosphere and asthenosphere from teleseismic P and S waveforms. The models are parametrized in terms of density and the 21 elastic coefficients of the fourth-order elasticity tensor. The inversion method makes no a priori assumptions on the symmetry class or on the orientation of the symmetry axes. Instead, the elasticity tensors in the final models are decomposed with the projection method. This method allows us to determine the orientation of the symmetry axes and to extract the contributions of each symmetry class. From simple synthetic experiments, we demonstrate that our full-waveform inversion method is able to image complex 3-D anisotropic structures. In particular, the method is able to almost perfectly recover the general orientation of the symmetry axis or complex layered anisotropic models, which are both extremely challenging problems. We attribute this success to the joint exploitation of both P and S teleseismic waves, which constrain different parts of the elasticity tensor. Another key ingredient is the pre-conditioning of the gradient with an approximate inverse Hessian computed with scattering integrals. The inverse Hessian is crucial for mitigating the artefacts resulting from the uneven (mostly vertical) illumination of teleseismic acquisitions.

show abstract

Adjoint Tomography of Ambient Noise Data and Teleseismic P Waves: Methodology and Applications to Central California

et al. 2021

View full text Add to dashboard Cite

show abstract

On the sensitivity of teleseismic full-waveform inversion to earth parametrization, initial model and acquisition design

Cited by 19 publications

References 62 publications

Lithospheric architecture of the South-Western Alps revealed by multiparameter teleseismic full-waveform inversion

Lithospheric architecture of the South-Western Alps revealed by multiparameter teleseismic full-waveform inversion

Probing depth and lateral variations of upper-mantle seismic anisotropy from full-waveform inversion of teleseismic body-waves

Adjoint Tomography of Ambient Noise Data and Teleseismic P Waves: Methodology and Applications to Central California

Contact Info

Product

Resources

About