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2 edition of Lower mantle heterogeneity, dynamic topography and the geoid found in the catalog.

Lower mantle heterogeneity, dynamic topography and the geoid

Lower mantle heterogeneity, dynamic topography and the geoid

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  • 39 Currently reading

Published by National Aeronautics and Space Administration in [Washington, D.C.? .
Written in English

    Subjects:
  • Earth -- Figure.,
  • Earth -- Mantle.

  • Edition Notes

    StatementBradford H. Hager ... [et al.].
    SeriesNASA-CR -- 173621., NASA contractor report -- NASA CR-173621.
    ContributionsHager, Bradford H., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17831625M


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Lower mantle heterogeneity, dynamic topography and the geoid Download PDF EPUB FB2

Density contrasts in the lower mantle, inferred using seismic tomography, drive viscous flow; this results in kilometres Lower mantle heterogeneity dynamically maintained topography at the core–mantle boundary and at Lower Lower mantle heterogeneity heterogeneity, dynamic topography and the geoid: Authors: Hager, B.

H Density contrasts in the lower mantle, recently imaged using seismic tomography, drive convective flow which results in kilometers of dynamically maintained topography at the core-mantle boundary and at the earth's surface.

field due to interior density This finding led Hager et al. () to propose the idea of dynamic topography as a major cause of this unique geoid pattern: assuming these lower mantle slowvelocity structures are hot and Lower mantle heterogeneity, dynamic topography and the geoid. By Bradford H.

Hager, Robert W. Clayton, Mark A. Richards, Robert P. Comer and Adam M. Dziewonski. Abstract. Density contrasts in the lower mantle, inferred using seismic tomography, drive viscous flow; this results in kilometres of dynamically maintained topography at the core Get this from a library.

Lower mantle heterogeneity, dynamic topography and the geoid. [Bradford H Hager; United States. National Aeronautics and Space Administration.;] Density contrasts in the lower mantle, inferred using seismic tomography, drive viscous flow; this results in kilometres of dynamically maintained topography at the core-mantle boundary and at the Earth's surface.

The total gravity field due to interior density contrasts and dynamic boundary topography predicts the longest-wavelength components of the geoid remarkably ://   Neglecting dynamic surface deformation leads to geoid anomalies of opposite sign to those observed.

Lower mantle heterogeneity, dynamic topography and the geoid al. Lower mantle heterogeneity ?error=cookies_not_supported&code=ec01c-d. Lower mantle heterogeneity, dynamic topography and the geoid.

By A. M Density contrasts in the lower mantle, recently imaged using seismic tomography, drive convective flow which results in kilometers of dynamically maintained topography at the core-mantle boundary and at the Earth's surface.

field due to interior density contrasts and Erratum: Lower mantle heterogeneity, dynamic topography and the geoid Hager, B. Subducted slabs and the geoid: constraints on mantle rheology and flow.

Geophys. Res. 89, A mean dynamic topography computed over the world ocean from In fact, it serves like a barrier between the upper and lower mantle, which significantly reduces the dynamic topography induced by lower mantle heterogeneity and, as a result, affects the dynamic geoid. The calculated geoid better fits to the observed one than the obtained without considering the TZ ://   For a Venus-like planet, with a large outer radius and a relatively thin elastic lithosphere, the dynamic surface topography is only weakly modulated by the elastic shell and a purely viscous model with d e = 0 may provide a good first approximation of the dynamic surface topography and the geoid, at least at low degrees.

In contrast, even a   Inferring the viscosity and the 3-D density structure of the mantle from geoid, topography and plate velocities Yanick Ricard. Lower mantle heterogeneity, dynamic topography, and the geoid Dynamical influences on topography and geoid from recent high-pressure experiments: variations of d ln V/d ln p with depth,   explain Cenozoic and Mesozoic plate motions fairly well, and they are also remarkably successful in modeling the present-day mantle density heterogeneity structure in- ferred from studies of seismic tomography and the geoid [Richards and Engebretson, ; Ricard et al., ] as well as dynamic topography and continental flooding [Gumis, ].~archer/deep_earth_readings/lithgow-bertelloniplates.

Earth’s interior—composition and state; KEYWORDS: subduction, geoid, dynamic topography, mantle convection 1. Introduction [2] The association between local maxima in the long-wave-length component of the Earth’s gravitational potential field (geoid) and subduction zones has been recognized by many   induced in the upper and lower mantle to the geoid, dynamic topography and surface velocities __ Chapter VIII.

Conclusions Appendix. Derivation of the U-transform and W-transform iterative methods Part U The geoid constraint in global geodynamics: viscosity structure, mantle heterogeneity models and boundary conditions New Theory of the Earth; New Theory of the Earth.

New Theory of the Earth Lower mantle heterogeneity, dynamic topography and the geoid. Nature,–5. Rapp, R. () The Earth's gravity field to degree and order using Seaset altimeter data, terrestrial gravity data, and other data.

Layered mantle convection: a model for   N 84 - 2 6 1 8 4 Lower Mantle Heterogeneity. Dynamic Topography and the Geoid by Bradford H. Hager Robert W.

Clayton Mark A. Richards Robert P. Comer* Adam M. Dziewonskft Seismological Laboratory California Institute of Technology Pasadena, California 1 now at: Department of Earth and Space Sciences State University of New York Stony These observations are compatible with whole mantle convection models which include a viscosity increase with depth.

Lower mantle strain (mixing) rates and horizontal motions at, e.g., the core-mantle boundary are sufficiently reduced if lower mantle viscosity is about 1–2 orders of magnitude greater than that of the upper :// Abstract.

Recent high pressure measurements of the phase diagram of mantle material (Ito and Takahashi, ) have demonstrated rather clearly that the phase-loop for the divariant Spinel-post Spinel transition is extremely narrow in pressure and that the Clapeyron slope of this transition is near M Pa/°ely high resolution calculations of the nature of convective mixing in a flow DYNAMICS OF THE CORE-MANTLE BOUNDARY AND THE DECADAL FLUCTUATION IN THE EARTH’S ROTATION FU Rongshan ①, LI Ligang ①, ZHENG Dawei ②,XUE Tingxiao ① ①University of Science and Technology of China,Hefei, China Implications of lower-mantle structural heterogeneity for the existence and nature of whole-mantle plumes Author(s) Edward J.

Garnero Edward J. Garnero 1. School of Earth and Space Exploration, Bateman Physical Sciences Building, F-Wing, Arizona State University, Tempe, ArizonaUSA Lower mantle heterogeneity, dynamic topography Dynamic Topography Revisited Dynamic topography is usually considered to be one of the trinity of contributing causes to the Earth's non-hydrostatic topography along with the long-term elastic strength of the lithosphere and isostatic responses to density anomalies within the lithosphere.

Dynamic topography, thought of this way, is what is left over when other sources of support have been Layered mantle convection, with a shallow origin for surface dynamic topography, is consistent with the spectrum, small amplitude and pattern of the topography.

Layered mantle convection, with a barrier about km deeper than the km phase boundary, provides a self-consistent geodynamic model for the amplitude and pattern of both the long About Cookies, including instructions on how to turn off cookies if you wish to do so.

By continuing to browse this site you agree to us using cookies as described in 参考文献 (References) [1 ] Dubuffet F, Rabinowicz M, Monnereau M. Multiple scales in mantle convection. Earth and Planetary Science Letters,~ [2 ] Hager B H, Clayton R W, Richards M A, et al. Lower mantle  › 百度文库 › 行业资料. This is a somewhat surprising result because the seismic structure at the bottom of lower mantle correlates well with long‐wavelength geoid, the observation that reinforced the high‐viscosity lower mantle model [Hager et al., ].

Liu and Zhong show that the middle to upper part of the lower mantle also correlates well with the observed The influence of deep mantle heterogeneity on the rhythms and scales of surface topography evolution is continuously reorganised.

A large part of Earth's topography is generated by mantle motions and lithospheric stresses [1], which impacts for instance the global sea-level, the dynamics of sedimentary basins and the geoid. GSA Today, 2 The lower correlation for lower degrees can be understood because of the very different sensitivities of geoid and topography to density anomalies at different depths: Dynamic topography is always most sensitive to density anomalies at shallowest depth, whereas the geoid is more sensitive to deeper structures, and a positive density anomaly may   The flow results in dynamic topography at the Earth's surface, the core-mantle boundary (CMB), and at any interior compositional boundaries that are included in the model (e.g., the D" layer above the CMB, the km discontinuity).

This dynamic topography, which is a strong function of the viscosity and compositional structure of the Lower mantle heterogeneity, dynamic topography and the geoid BH Hager, RW Clayton, MA Richards, RP Comer, AM Dziewonski Nature (),?user=K7AqyooAAAAJ&.

Abstract. Much effort is being made to extract the dynamic components of the Earth's topography driven by density heterogeneities in the mantle.

Seismically mapped density anomalies have been used as an input into mantle convection models to predict the present-day mantle flow and stresses applied on the Earth's surface, resulting in dynamic ://   computed topography on the surface of a viscous mantle with driving loads constrained via a tomographic inversion of mantle seismic heterogeneity.

In their isostatic topography dynamic topography and the Geoid, Nature, ;sequence=1. Conrad, C.P., and L. Husson, Influence of dynamic topography on sea level and its rate of change, Lithosphere, in press, A WORLD WITHOUT MANTLE DYNAMICS By removing dynamic deflections of Earth’s topography and geoid from the Earth’s present-day topography and sea surface, and by dropping sea level 92 m, we create an image of how the Snap-shot (instantaneous) dynamic model of the mantle /snap-shot-instantaneous-dynamic-model-of-the-mantle.

Steinberger, B.: Slabs in the lower mantle – results of dynamic modelling compared with tomographic images and the geoid, Phys.

Earth Planet. In.,–, b. In.,–, b. Steinberger, B.: Effects of latent heat release at phase boundaries on flow in the Earth's mantle, phase boundary topography and dynamic   Surface Observables 1. Recommended Reading: • Radial viscosity structure: Hager and Richards () and Forte and Mitrovica ().

• Lateral viscosity variations: Cadek and Fleitout () and Zhong and Davies () • Mantle structure, composition and seismology: Kellogg et al. () and Tackley (b). Other Reading: • Post Glacial Rebound: Mitrovica (), Simons and Hager ~becker/myres/myres1/lecture_slides/ the mantle dynamics [Cizkova et al., ; Nakagawa and Tackley, ].

Therefore, it is reasonable to use the observed geoid and dynamic topography to constrain the lateral viscosity variations (LVVs) in the D″ layer. Geoid variations have been used to infer radial viscosity [Kido and   The mass anomalies resulting from dynamic topography have a major effect on the geoid, which places strong constraints on mantle structure.

Almost 90% of the observed geoid can be explained by density anomalies inferred from tomography and a model of subducted slabs, along with the resulting dynamic topography   The geoid modeling studies predict ±1 km long-wavelength dynamic topography (i.e., using the first definition or the dynamic topography caused by sublithospheric mantle structure) with positive topography in the Pacific and Africa (Fig.

6b) [e.g., Hager et al., ; Hager and Richards, ], as discussed in section ://. Effect of lateral viscosity variations in the top km on the geoid and dynamic topography O. Cadekˇ 1 and L. Fleitout2 1Department of Geophysics, Faculty of Mathematics and Physics, Charles University, V Holeˇsoviˇck´ach 2, Prague, Czech Republic.

E-mail: [email protected]~oc/gjipdf.The dynamics of Cenozoic and Mesozoic plate motions The dynamics of Cenozoic and Mesozoic plate motions Lithgow‐Bertelloni, Carolina; Richards, Mark A. Our understanding of the dynamics of plate motions is based almost entirely upon modeling of present‐day plate motions.

A fuller understanding, however, can be derived from consideration of the history of plate ://This "Cited by" count includes citations to the following articles in Scholar.

Lower mantle heterogeneity, dynamic topography and the geoid. BH Hager, RW Clayton, MA Richards, RP Comer, AM Dziewonski PR Renne, MT Black, Z Zichao, MA Richards, AR Basu.

Science (),Geoid anomalies in a dynamic Earth. MA ?user=uCjZ69sAAAAJ&hl=en.