2017
DOI: 10.1093/gji/ggx415
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Resolving the fine-scale velocity structure of continental hyperextension at the Deep Galicia Margin using full-waveform inversion

Abstract: SummaryContinental hyperextension during magma-poor rifting at the Deep Galicia Margin is characterised by a complex pattern of faulting, thin continental fault blocks, and the serpentinisation, with local exhumation, of mantle peridotites along the S-reflector, interpreted as a detachment surface. In order to understand fully the evolution of these features, it is important to image seismically the structure and to model the velocity structure to the greatest resolution possible. Travel-time tomography models… Show more

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Cited by 26 publications
(21 citation statements)
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“…The improved spatial resolution provided by the 3D volume ( Supplementary Figure S1) reveals the internal structure of the fault blocks, showing that S developed late in the rifting evolution and slipped at low-angle ( Figure 7). Crystalline basement, sampled by submersible and identified more widely from seismic velocities (Bayrakci et al, 2016;Davy et al, 2018), is overlain by a thin internally poorly reflective package (A), that we interpret as predating the current fault blocks (Figures 5 and 7). Overlying A is a thicker, more ubiquitous and reflective series of sediments (B); small offsets in the fine layering of package B show that this unit is intensely fractured and faulted.…”
Section: Timing and Angle Of Slip On Smentioning
confidence: 91%
“…The improved spatial resolution provided by the 3D volume ( Supplementary Figure S1) reveals the internal structure of the fault blocks, showing that S developed late in the rifting evolution and slipped at low-angle ( Figure 7). Crystalline basement, sampled by submersible and identified more widely from seismic velocities (Bayrakci et al, 2016;Davy et al, 2018), is overlain by a thin internally poorly reflective package (A), that we interpret as predating the current fault blocks (Figures 5 and 7). Overlying A is a thicker, more ubiquitous and reflective series of sediments (B); small offsets in the fine layering of package B show that this unit is intensely fractured and faulted.…”
Section: Timing and Angle Of Slip On Smentioning
confidence: 91%
“…Recently, by using full waveform information of seismic data, full waveform inversion (FWI) is now one of S. Li, B. Liu, Y. Ren, S. yang, Y. Wang the most appealing methods to reconstruct the velocity model with high accuracy and resolution [1]- [3]. FWI was firstly proposed in the early 1980s.…”
Section: Introductionmentioning
confidence: 99%
“…The northeastern Nova Scotia continental offshore is widely classified as a magma-poor rifted margin (e.g., Funck et al, 2004;Keen & Cordsen, 1981;Keen et al, 1991;Lau et al, 2018;Sibuet et al, 2012;Wu et al, 2006) with crustal structures similar to the extensively investigated Newfoundland-Grand Banks margin (e.g., Funck et al, 2003;Lau et al, 2006;Shillington et al, 2006;van Avendonk et al, 2006) to the north and its Iberia conjugate margin (e.g., Clark et al, 2007;Davy et al, 2016;Davy et al, 2018;Dean et al, 2015). Along all these margins, a continent-ocean transition (COT) is commonly characterized by a layer of transitional crust that overlies a serpentinized mantle layer, as interpreted based on modeled seismic velocities that are lower (<8.0 km/s) than for unaltered peridotites, with some areas having exhumed serpentinized mantle (ESM) overlain directly by sediments.…”
Section: Introductionmentioning
confidence: 99%