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

Beller, Stephen; Monteiller, Vadim; Operto, S.; Nolet, Guust; Ambert, Paul; Zhao, Liang

doi:10.1093/gji/ggx216

Cited by 66 publications

(80 citation statements)

References 103 publications

(157 reference statements)

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“…15mately 100 km depth. This agrees with the models ofBeller et al (2017) (full-waveform modeling) andLippitsch et al (2003, body-wave tomography), who locate the gap between 80 and 150 km depth. In contrast, other tomographic models image a continuous slab down to at least 250 km depth(Koulakov et al, 2009; Zhao et al, 2016;Hua et al, 2017;Lyu et al, 2017).Zhao et al (2016) use a synthetic test to argue that the thin (∼50 km thick) link between European lithosphere and subducting slab is a robust feature.…”

supporting

confidence: 90%

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Slab Break-offs in the Alpine Subduction Zone

Kästle¹,

Rosenberg

Boschi

et al. 2019

Preprint

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Abstract. After the onset of plate collision in the Alps, tectonic processes are inferred to have changed dramatically in the Alps: European plate break-offs in various places of the Alpine arc, as well as a subduction polarity reversal in the eastern Alps have been proposed. We review body-wave tomographic studies, compare them to our surface-wave-derived model, and interpret them in terms of slab geometries. We infer that the shallow subducting portion of the European plate is likely detached under both the western and eastern (but not the central) Alps. The Alps-Dinarides transition may be explained by a combination of European and Adriatic subduction. This implies that the deep high-velocity anomaly (> 200 km depth) mapped by tomographers under the eastern Alps is a detached segment of the European plate. The shallower fast anomaly (100–200 km depth) can be ascribed to European or Adriatic subduction, or both. These findings are compared to previously proposed models for the eastern Alps in terms of slab geometry, but also integrated in a a new, alternative geodynamic scenario that best fits both tomographic images and geological constraints.

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supporting

confidence: 90%

“…2A). Such a break-off is also proposed by the model of Beller et al (2017), using full-waveform inversion along a dense seismic profile.…”

Section: Body-wave Tomographymentioning

confidence: 98%

Slab Break-offs in the Alpine Subduction Zone

Kästle¹,

Rosenberg

Boschi

et al. 2019

Preprint

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“…A large number of detailed models based on body-wave travel times have become available in the last 15 years (Piromallo and Morelli 2003;Lippitsch et al 2003;Spakman and Wortel 2004;Koulakov et al 2009;Dando et al 2011;Mitterbauer et al 2011;Zhao et al 2016a;Hua et al 2017), and recently also models based on full-waveform inversions (i.e., including both body and surface waves, e.g., Zhu et al 2015;Fichtner and Villaseñor 2015;Beller et al 2017;Fichtner et al 2018). For the present study, we use a selection of those models and plot them along four section traces all perpendicular to the orogen, applying the same velocity color model (Figs.…”

Section: Body-wave Tomographymentioning

confidence: 99%

Slab break-offs in the Alpine subduction zone

Kästle

Rosenberg

Boschi

et al. 2020

Int J Earth Sci (Geol Rundsch)

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After the onset of plate collision in the Alps, at 32-34 Ma, the deep structure of the orogen is inferred to have changed dramatically: European plate break-offs in various places of the Alpine arc, as well as a possible reversal of subduction polarity in the eastern Alps have been proposed. We review different high-resolution tomographic studies of the upper mantle and combine shear-and body-wave models to assess the most reliable geometries of the slabs. Several hypotheses for the tectonic evolution are presented and tested against the tomographic model interpretations and constraints from geologic and geodetic observations. We favor the interpretation of a recent European slab break-off under the western Alps. In the eastern Alps, we review three published scenarios for the subduction structure and propose a fourth one to reconcile the results from tomography and geology. We suggest that the fast slab anomalies are mainly due to European subduction; Adriatic subduction plays no or only a minor role along the Tauern window sections, possibly increasing towards the Dinarides. The apparent northward dip of the slab under the eastern Alps may be caused by imaging a combination of Adriatic slab, from the Dinaric subduction system, and a deeper lying European one, as well as by an overturned, retreating European slab.

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“…Even though the Finite Difference (FD) Efficient high degree spectral element method still dominates in the seismic exploration community, the spectral element method (SEM) (Maday and Patera, 1989;Seriani and Priolo, 1994;Komatitsch and Vilotte, 1998;Komatitsch and Tromp, 1999;Chaljub et al, 2007) has been gaining more and more popularity, especially in the academic community. It is often the chosen method for global or regional Earth scale seismic imaging developments based on adjoint methods and full waveform inversion method (Capdeville et al, 2005;Tromp et al, 2005;Fichtner et al, 2009;Zhu et al, 2012;Monteiller et al, 2015;Wang et al, 2016;Beller et al, 2018;Trinh et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Efficiency of the spectral element method with very high polynomial degree to solve the elastic wave equation

2020

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The spectral element method (SEM) has gained tremendous popularity within the seismological community to solve the wave equation at all scales. Classic SEM applications mostly rely on degrees 4–8 elements in each tensorial direction. Higher degrees are usually not considered due to two main reasons. First, high degrees imply large elements, which make the meshing of mechanical discontinuities difficult. Second, the SEM’s collocation points cluster toward the edge of the elements with the degree, degrading the time-marching stability criteria and imposing a small time step and a high numerical cost. Recently, the homogenization method has been introduced in seismology. This method can be seen as a preprocessing step before solving the wave equation that smooths out the internal mechanical discontinuities of the elastic model. It releases the meshing constraint and makes use of very high degree elements more attractive. Thus, we address the question of memory and computing time efficiency of very high degree elements in SEM, up to degree 40. Numerical analyses reveal that, for a fixed accuracy, very high degree elements require less computer memory than low-degree elements. With minimum sampling points per minimum wavelength of 2.5, the memory needed for a degree 20 is about a quarter that of the one necessary for a degree 4 in two dimensions and about one-eighth in three dimensions. Moreover, for the SEM codes tested in this work, the computation time with degrees 12–24 can be up to twice faster than the classic degree 4. This makes SEM with very high degrees attractive and competitive for solving the wave equation in many situations.

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

Cited by 66 publications

References 103 publications

Slab Break-offs in the Alpine Subduction Zone

Slab Break-offs in the Alpine Subduction Zone

Slab break-offs in the Alpine subduction zone

Efficiency of the spectral element method with very high polynomial degree to solve the elastic wave equation

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