Whole mantle P-wave travel time tomography

Inoue, Hiroshi; Fukao, Yoshio; Tanabe, Kunio; Ogata, Yosihiko

doi:10.1016/0031-9201(90)90236-q

Cited by 357 publications

(197 citation statements)

References 39 publications

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“…The velocity model could explain the observed amplitude variation qualitatively, but the scatter in the observed amplitudes was large. Fukao et al (1992) used Inoue et al (1990)'s inversion scheme to study the fate of the subducted slabs in detail by discretizing the whole mantle into blocks with finer blocks in the northwestern Pacific subduction zones. They accounted for the effects of lateral heterogeneity outside the subduction zones by obtaining the deep slab structure and the lateral heterogeneity outside the region of interest simultaneously.…”

Section: Slab Penetration Into the Lower Mantlementioning

confidence: 99%

“…3 and 10) (Inoue et al, 1990;Fukao et al, 1992) and geological data, Maruyama et al (1993) proposed a hypothesis named "Plume Tectonics ," in which large-scale hot and cold plumes are mainly controlling mantle dynamics. In his hypothesis, cold slabs stagnant at the bottom of the upper mantle sink to the core-mantle boundary because of their cold temperature.…”

Section: Slab Penetration Into the Lower Mantlementioning

confidence: 99%

“…Cold remnant slabs disturb the temperature field at the core-mantle boundary and cause a thermal instability that produces upwelling hot plumes. He interpreted the high-velocity regions at depths of 700-1,700km surrounding the Pacific and beneath the Tethys Sea depicted by tomographic studies (e.g., Inoue et al, 1990) as cold plumes (sinking remnant slabs), since they are located where slabs have been presumably subducted in the past 180 m.y. Broad low-velocity regions in the southern Pacific and the southern Africa may be interpreted as upwelling hot plumes generated by temperature disturbances due to cold remnant slabs.…”

Section: Slab Penetration Into the Lower Mantlementioning

confidence: 99%

“…The high-frequency anomalies (equivalent to high-velocity anomalies) are located in the western Pacific and central Atlantic, which are consistent with previous studies (e.g., Masters et al, 1982) and the high-attenuation anomalies are located in the central Pacific and southern Africa. The high-attenuation anomalies located presumably in the transition zone correlate with regions of slow P-wave velocity in the lower mantle (e.g., Inoue et al, 1990) and with hotspots. Suda et al (1991) suggested that this correlation may represent a continuation of lower mantle upwelling into the transition zone.…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper we will review only global P-wave tomographic inversion. Inoue et al (1990) developed a method of tomographic inversion to obtain three-dimensional P-wave velocity perturbations in the whole mantle and applied it to more than two million ISC P-wave arrival time data. Their method was an iterative procedure and consisted of relocations of events, back projection of travel time residuals into the mantle, and refinement of the spherically symmetric earth model.…”

Section: Introductionmentioning

confidence: 99%

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Recent Seismological Studies on Upper Mantle Structure.

Suetsugu

1995

J,Phys,Earth

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Our understanding of three-dimensional upper mantle structure has been greatly advanced in the last decade. We review recent seismological studies on upper mantle structure conducted in Japanese universities and institutes. Studies reviewed in the present paper involve global and regional mantle heterogeneity, large-scale seismic anisotropy derived from surface wave dispersion, topography of the 410-km and the 660-km discontinuities, and the fate of deep slabs.

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Section: Slab Penetration Into the Lower Mantlementioning

confidence: 99%

Section: Slab Penetration Into the Lower Mantlementioning

confidence: 99%

Section: Slab Penetration Into the Lower Mantlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent Seismological Studies on Upper Mantle Structure.

Suetsugu

1995

J,Phys,Earth

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Anisotropic Rayleigh wave phase velocity maps of eastern China

et al. 2014

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We explore the variations of Rayleigh wave phase velocity beneath eastern China in a broad period range (20-200 s). Rayleigh wave dispersion curves are measured by the two-station technique for a total of 734 interstation paths using vertical component broadband waveforms at 39 seismic stations in eastern China from 466 global earthquakes. In addition, 599 waveform inversion interstation measurements were added to this data set. The interstation dispersion curves are then inverted for high-resolution isotropic and azimuthally anisotropic phase velocity maps at periods between 20 and 200 s. At shorter periods sampling the crustal depth range, phase velocities are higher in the southeastern part of the region, reflecting the thinner crust there. The Jiangnan Belt separates Cathaysia from the Yangtze Craton, the latter with thicker crust and a deep, high-velocity cratonic root. The eastern part of Yangtze Craton, however, east of 115-116• E, does not display a deep root and has a thin lithosphere. Azimuthal anisotropy at long periods (>120 s) shows fast propagation directions broadly similar to that of the absolute plate motion. Beneath Cathaysia and eastern Yangtze Craton, anisotropy in the asthenosphere is strong and suggests coast-perpendicular flow. Asthenospheric flow from beneath China's thick continental lithosphere toward the thinner lithosphere of the margin and the resulting decompression melting may be the fundamental causes of the intraplate basaltic volcanism along the eastern coast of China.

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Density and P‐wave velocity structure beneath the Paraná Magmatic Province: Refertilization of an ancient lithospheric mantle

Chaves

Ussami

Ritsema

2016

Geochem Geophys Geosyst

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We estimate density and P‐wave velocity perturbations in the mantle beneath the southeastern South America plate from geoid anomalies and P‐wave traveltime residuals to constrain the structure of the lithosphere underneath the Paraná Magmatic Province (PMP) and conterminous geological provinces. Our analysis shows a consistent correlation between density and velocity anomalies. The P‐wave speed and density are 1% and 15 kg/m3 lower, respectively, in the upper mantle under the Late Cretaceous to Cenozoic alkaline provinces, except beneath the Goiás Alkaline Province (GAP), where density (+20 kg/m3) and velocity (+0.5%) are relatively high. Underneath the PMP, the density is higher by about 50 kg/m3 in the north and 25 kg/m3 in the south, to a depth of 250 − 300 km. These values correlate with high‐velocity perturbations of +0.5% and +0.3%, respectively. Profiles of density perturbation versus depth in the upper mantle are different for the PMP and the adjacent Archean São Francisco (SFC) and Amazonian (AC) cratons. The Paleoproterozoic PMP basement has a high‐density root. The density is relatively low in the SFC and AC lithospheres. A reduction of density is a typical characteristic of chemically depleted Archean cratons. A more fertile Proterozoic and Phanerozoic subcontinental lithospheric mantle has a higher density, as deduced from density estimates of mantle xenoliths of different ages and composition. In conjunction with Re‐Os isotopic studies of the PMP basalts, chemical and isotopic analyses of peridodite xenoliths from the GAP in the northern PMP, and electromagnetic induction experiments of the PMP lithosphere, our density and P‐wave speed models suggest that the densification of the PMP lithosphere and flood basalt generation are related to mantle refertilization. Metasomatic refertilization resulted from the introduction of asthenospheric components from the mantle wedge above Proterozoic subduction zones, which surrounded the Paraná lithosphere. The high‐density PMP lithosphere is presently gravitationally unstable and prone to delamination.

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Whole mantle P-wave travel time tomography

Cited by 357 publications

References 39 publications

Recent Seismological Studies on Upper Mantle Structure.

Recent Seismological Studies on Upper Mantle Structure.

Anisotropic Rayleigh wave phase velocity maps of eastern China

Density and P‐wave velocity structure beneath the Paraná Magmatic Province: Refertilization of an ancient lithospheric mantle

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