Constraints on Mantle Convection From Seismic Tomography

Kárason, H.; Hilst, R. D. van der

doi:10.1029/gm121p0277

Cited by 145 publications

(147 citation statements)

References 68 publications

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“…We mitigate effects of uneven data coverage by means of an adaptive parameterization based on the sampling density of the high-frequency data (Abers and Roecker, 1991;Bijwaard et al, 1998;Kárason and van der Hilst, 2000). Each block in the grid used in the inversion consists of one or more base blocks of 45 km × 0.7 • × 0.7 • .…”

Section: Adaptive Gridmentioning

confidence: 99%

“…We account for sensitivity to structure away from the optical ray path with 3D Fréchet derivatives (sensitivity kernels) estimated from single forward scattering; for details see Kárason (2002) and van der Hilst et al (in preparation). For the spatial resolution sought here these low frequency data may seem superfluous, but the PP-P differential times constrain large wavelength variations in the region under investigation.…”

Section: Datamentioning

confidence: 99%

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Constraining P-wave velocity variations in the upper mantle beneath Southeast Asia

Hilst

Toksöz

2006

Physics of the Earth and Planetary Interiors

178

135

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We have produced a P-wave model of the upper mantle beneath Southeast (SE) Asia from reprocessed short period International Seismological Centre (ISC) P and pP data, short period P data of the Annual Bulletin of Chinese Earthquakes (ABCE), and long period PP-P data. We used 3D sensitivity kernels to combine the datasets, and mantle structure was parameterized with an irregular grid. In the best-sampled region our data resolve structure on scale lengths less than 150 km. The smearing of crustal anomalies to larger depths is reduced by a crustal correction using an a priori 3D model. Our tomographic inversions reveal high-velocity roots beneath the Archean Ordos Plateau, the Sichuan Basin, and other continental blocks in SE Asia. Beneath the Himalayan Block we detect high seismic velocities, which we associate with subduction of Indian lithospheric mantle. This structure is visible above the 410 km discontinuity and may not connect to the remnant of the Neo-Tethys oceanic slab in the lower mantle. Our images suggest that only the southwestern part of the Tibetan plateau is underlain by Indian lithosphere and, thus, that the upper mantle beneath northeastern Tibet is primarily of Asian origin. Our imaging also reveals a large-scale high-velocity structure in the transition zone beneath the Yangtze Craton, which could have been produced in multiple subduction episodes. The low P-wave velocities beneath the Hainan Island are most prominent in the upper mantle and transition zone; they may represent counter flow from the surrounding subduction zones, and may not be unrelated to processes beneath eastern Tibet.

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Section: Adaptive Gridmentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Constraining P-wave velocity variations in the upper mantle beneath Southeast Asia

Hilst

Toksöz

2006

Physics of the Earth and Planetary Interiors

178

135

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“…Cross-sections of a recent P-wave model [van der Hilst et al, in preparation] to illustrate the likely complexity of slab structures. This model was obtained by inversion of travel time data from P, PP, pP, and several core phases (PKP, Pdiff ), using an irregular grid parameterization, finite frequency sensitivity kernels [see also Kárason and van der Hilst, 2000], and corrections for crustal structure according to CRUST2.0 [http://mahi.ucsd.edu/Gabi/crust2.html]. The perturbations are shown in percent with respect to ak135 [Kennet et al, 1995].…”

Section: High-resolution Modelsmentioning

confidence: 99%

“…Among the success stories of global tomography are the delineation of long-wavelength variations in elastic properties in Earth's mantle, which started in the early 1980s, and the detailed delineation, over the last decade or so, of trajectories of mantle convection [see reviews by, e.g., Dziewonski and Woodhouse, 1987;Woodhouse and Dziewonski, 1989;Masters, 1989;Romanowicz, 1991;Montagner, 1994;Masters and Shearer, 1995;Ritzwoller and Lavely, 1995;Dziewonski, 1996;Masters et al, 2000;Kárason and van der Hilst, 2000;Fukao et al, 2001;Romanowicz, 2003]. It is encouraging to see that increasingly consistent information on the spatial patterns of wave speed variations is emerging from tomographic studies that use different data and/or techniques.…”

Section: Introductionmentioning

confidence: 99%

Towards a quantitative interpretation of global seismic tomography

Trampert

Hilst

2005

Geophysical Monograph Series

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We review the success of seismic tomography in delineating spatial variations in the propagation speed of seismic waves on length scales from several hundreds to many thousands of kilometers. In most interpretations these wave speed variations are thought to reflect variations in temperature. Careful consideration of shear wave, bulk sound, and, most recently, density variations is, however, producing increasingly compelling evidence for chemical heterogeneity (that is, spatial variations in bulk major element composition) having a first-order effect on the lateral variations in mass density and elasticity of the mantle. This has profound consequences for our understanding of mantle dynamics and the thermochemical evolution of our planet. We argue that the quantitative integration of constraints from seismology, mineral physics, and geodynamics, which underlies the inference of thermochemical parameters, requires careful uncertainty analyses and should move away from emphasizing visually pleasing images and single, nonunique solutions.

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“…Xu (2014) in this volume provides evidence for the involvement of recycled oceanic crust components in the source of intraplate basalts that were emplaced during 90-40 Ma in the north and northeast China. He argues that components derived from recycled oceanic crust may have been derived from stagnant Pacific slab within the mantle transition zone, which has been seismically detected (Kárason and van der Hilst, 2000;Wang and Chen, 2009;Li and Yuen, 2014). The results imply that the influence of Pacific plate subduction on the eastern Asian continent can be traced back at least to the Late Cretaceous.…”

mentioning

confidence: 72%