Depth of principal mass anomalies contributing to the earth's geoidal undulations and gravity anomalies∗

Bowin, Carl

doi:10.1080/15210608309379476

Cited by 109 publications

(86 citation statements)

References 31 publications

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“…The path I traversed to be able to document that plate tectonics conserves angular momentum was an uncommon one, and also provides significant details concerning the Earth's deep structure that led to that result. My initial principal research activities at the Woods Hole Oceanographic Institution (WHOI) were involved in developing and managing a real-time marine gravity program (Bernstein and Bowin, 1963), and using gravity observations to elucidate Earth structures (Bowin, 1983(Bowin, , 1986(Bowin, , 1991(Bowin, , 1997Bowin et al, 1978Bowin et al, , 1986. Figure 1 compares spherical harmonic power spectra for the planetary bodies Earth, Venus, and Mars.…”

Section: Figmentioning

confidence: 99%

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Plate tectonics conserves angular momentum

Bowin¹

2010

eEarth

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Abstract.A new combined understanding of plate tectonics, Earth internal structure, and the role of impulse in deformation of the Earth's crust is presented. Plate accelerations and decelerations have been revealed by iterative filtering of the quaternion history for the Euler poles that define absolute plate motion history for the past 68 million years, and provide an unprecedented precision for plate angular rotation variations with time at 2-million year intervals. Stage poles represent the angular rotation of a plate's motion between adjacent Euler poles, and from which the maximum velocity vector for a plate can be determined. The consistent maximum velocity variations, in turn, yield consistent estimates of plate accelerations and decelerations. The fact that the Pacific plate was shown to accelerate and decelerate, implied that conservation of plate tectonic angular momentum must be globally conserved, and that is confirmed by the results shown here (total angular momentum ∼1.4 +27 kg m 2 s −1 ).

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Section: Figmentioning

confidence: 99%

“…Note that the great increase in the range of gravity anomalies only occurs at very short wavelengths. Reprinted from Bowin (1983) (Harada and Hamano, 2000). Vector length is proportional to plate velocity.…”

Section: Figmentioning

confidence: 99%

Plate tectonics conserves angular momentum

Bowin¹

2010

eEarth

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“…When comparing predictions with real geoid data, it is crucial to properly filter the data to avoid undesirable deep convective effects. In most cases, this can be achieved to a good approximation by removing harmonic coefficients up to degree and order 9-10 from a complete undulation model (see Bowin [1983], Torne et al [1995], and Bowin [2000] for a more complete discussion).…”

Section: Appendix D: Gravity and Geoid Anomaliesmentioning

confidence: 99%

LitMod3D: An interactive 3‐D software to model the thermal, compositional, density, seismological, and rheological structure of the lithosphere and sublithospheric upper mantle

Fullea¹,

Afonso

Connolly

et al. 2009

Geochem Geophys Geosyst

122

166

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[1] We present an interactive 3-D computer program (LitMod3D) developed to perform combined geophysical-petrological modeling of the lithosphere and sublithospheric upper mantle. In contrast to other available modeling software, LitMod3D is built within an internally consistent thermodynamicgeophysical framework, where all relevant properties are functions of temperature, pressure, and composition. By simultaneously solving the heat transfer, thermodynamic, rheological, geopotential, and isostasy (local and flexural) equations, the program outputs temperature, pressure, surface heat flow, density (bulk and single phase), seismic wave velocities, geoid and gravity anomalies, elevation, and lithospheric strength for any given model. These outputs can be used to obtain thermal and compositional models of the lithosphere and sublithospheric upper mantle that simultaneously fit all available geophysical and petrological observables. We illustrate some of the advantages and limitations of LitMod3D using synthetic models and comparing our predictions with those from other modeling methods. In particular, we show that (1) temperature at midlithosphere depths may be overestimated by as much as 200 K when compositional heterogeneities in the mantle and T-P effects are not considered in lithospheric models and (2) the neglect of mantle phase transformations on gravity-based models in thin-crust settings can result in a significant overestimation and underestimation of the derived crustal thickness and its internal density distribution, respectively.

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“…As the geoid data include the effects of all distributed masses within the earth, the contribution of deeper mantle density sources must be removed from the observed geoid data using a reference geoid model in order to separate the anomalies contributed by lithospheric and sub-lithospheric mass variations (Bowin, 1983;Sandwell and Renkin, 1988). We, therefore, generated three residual geoid anomaly maps from the full spectrum geoid (Fig.…”

Section: Spectral Analysis Of the Geoidmentioning

confidence: 99%

“…In general, long wavelength components of geoid data (> 4000 km) are sensitive to the density variations in the lower mantle (Bowin, 1983), whereas, shorter wavelength components (< 330 km) reflect the crustal thickness variations and lithosphere flexural effects (Marks and Sandwell, 1991). Three residual geoid anomalies were generated ( Fig.…”

Section: Spectral Analysis Of the Geoidmentioning

confidence: 99%

Lithosphere structure and upper mantle characteristics below the Bay of Bengal

et al. 2016

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SUMMARY:The oceanic lithosphere in the Bay of Bengal (BOB) formed 80 -120 Ma following the breakup of eastern Gondwanaland. Since its formation, it has been affected by the emplacement of two long N-S trending linear aseismic ridges (85 o E and Ninetyeast) and by the loading of ca.20-km of sediments of the Bengal Fan. Here, we present the results of a combined spatial and spectral domain analysis of residual geoid, bathymetry and gravity data constrained by seismic reflection and refraction data. Self-consistent geoid and gravity modeling defined by temperature-dependent mantle densities along a N-S transect in the BOB region revealed that the depth to the Lithosphere-Asthenosphere boundary (LAB) deepens steeply from 77 km in the south to 127 km in north, with the greater thickness being anomalously thick compared to the lithosphere of similar-age beneath the Pacific Ocean. The Geoid-Topography Ratio (GTR) analysis of the 85°E and Ninetyeast ridges indicate that they are compensated at shallow depths.

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Depth of principal mass anomalies contributing to the earth's geoidal undulations and gravity anomalies∗

Cited by 109 publications

References 31 publications

Plate tectonics conserves angular momentum

Plate tectonics conserves angular momentum

LitMod3D: An interactive 3‐D software to model the thermal, compositional, density, seismological, and rheological structure of the lithosphere and sublithospheric upper mantle

Lithosphere structure and upper mantle characteristics below the Bay of Bengal

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