Global Crust-Mantle Density Contrast Estimated from EGM2008, DTM2008, CRUST2.0, and ICE-5G

Tenzer, Róbert; Hamayun,; Novák, Pavel; Gladkikh, Vladislav; Vajda, P.

doi:10.1007/s00024-011-0410-3

Cited by 61 publications

(27 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tenzer et al (2011), for instance, estimated that the average value of the global Moho density contrast is 485 kg/m 3 . This value very closely agrees with the value of 480 kg/m 3 adopted in the definition of the Preliminary Reference Earth Model (PREM; Dziewonski and Anderson 1981).…”

Section: Discussionmentioning

confidence: 99%

Comparative analysis of Vening-Meinesz Moritz isostatic models using the constant and variable crust-mantle density contrast – a case study of Zealandia

Bagherbandi

Tenzer

2013

J Earth Syst Sci

Self Cite

View full text Add to dashboard Cite

Comparative analysis of Vening-Meinesz Moritz isostatic models using the constant and variable crust-mantle density contrast -a case study of Zealandia. We compare three different numerical schemes of treating the Moho density contrast in gravimetric inverse problems for finding the Moho depths. The results are validated using the global crustal model CRUST2.0, which is determined based purely on seismic data. Firstly, the gravimetric recovery of the Moho depths is realized by solving Moritz's generalization of the Vening-Meinesz inverse problem of isostasy while the constant Moho density contrast is adopted. The Pratt-Hayford isostatic model is then facilitated to estimate the variable Moho density contrast. This variable Moho density contrast is subsequently used to determine the Moho depths. Finally, the combined least-squares approach is applied to estimate jointly the Moho depths and density contract based on a priori error model. The EGM2008 global gravity model and the DTM2006.0 global topographic/bathymetric model are used to generate the isostatic gravity anomalies. The comparison of numerical results reveals that the optimal isostatic inverse scheme should take into consideration both the variable depth and density of compensation. This is achieved by applying the combined least-squares approach for a simultaneous estimation of both Moho parameters. We demonstrate that the result obtained using this method has the best agreement with the CRUST2.0 Moho depths. The numerical experiments are conducted at the regional study area of New Zealand's continental shelf. Journal of Earth System

show abstract

Section: Discussionmentioning

confidence: 99%

Comparative analysis of Vening-Meinesz Moritz isostatic models using the constant and variable crust-mantle density contrast – a case study of Zealandia

Bagherbandi

Tenzer

2013

J Earth Syst Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…The 2 × 2 arc-deg CRUST2.0 sediment data were used to compute the corresponding stripping gravity correction up to degree 90 of spherical harmonics. The computational models and global numerical results investigating the gravitational contributions of the crustal density structures can be found in Tenzer et al, 2008;2009a;2009b;2010a;2010b;2011a;2011b).…”

Section: Data Acquisitionmentioning

confidence: 99%

Depth-dependent density change within the continental upper mantle

Tenzer

Bagherbandi

Vajda

2012

Contributions to Geophysics and Geodesy

Self Cite

View full text Add to dashboard Cite

Abstract:The empirical model of the depth-dependent density change within the upper continental mantle is derived in this study. The density of the upper(most) mantle underlying the continental crust is obtained from the estimated values of the crust-mantle (Moho) density contrast. Since the continental crustal thickness varies significantly, these upper mantle density values to a large extent reflect the density changes with depth. The estimation of the Moho density contrast is done through solving Moritz's generalization of the Vening-Meinesz inverse problem of isostasy. The solution combines gravity and seismic data in the least-squares estimation model. The estimated upper mantle density (beneath the continental crust) varies between 2770 and 3649 kg/m 3 . The upper mantle density increases almost proportionally with depth at a rate of 13 ± 2 kg/m 3 per 1 km at the investigated depth interval from 6 to 58 km.

show abstract

“…The range of the corresponding gravity anomalies is between -851 and 391 mGal. Tenzer et al [61] used these refined gravity and (CRUST2.0) crust-thickness data to estimate the global average value of the crust-mantle density contrast and the corresponding global average density of the upper-most mantle. They have shown that the average values of the global upper-most mantle and of the crust-mantle density contrast are about 3,155 kg/m 3 and 485 kg/m 3 , respectively.…”

Section: Numerical Examplesmentioning

confidence: 99%

Spectral harmonic analysis and synthesis of Earth’s crust gravity field

et al. 2011

Self Cite

View full text Add to dashboard Cite

We developed and applied a novel numerical scheme for a gravimetric forward modelling of the Earth's crustal density structures based entirely on methods for a spherical analysis and synthesis of the gravitational field. This numerical scheme utilises expressions for the gravitational potentials and their radial derivatives generated by the homogeneous or laterally varying mass density layers with a variable height/depth and thickness given in terms of spherical harmonics. We used these expressions to compute globally the complete crustcorrected Earth's gravity field and its contribution generated by the Earth's crust. The gravimetric forward modelling of large known mass density structures within the Earth's crust is realised by using global models of the Earth's gravity field (EGM2008), topography/bathymetry (DTM2006.0), continental icethickness (ICE-5G), and crustal density structures (CRUST2.0). The crust-corrected gravity field is obtained after modelling and subtracting the gravitational contribution of the Earth's crust from the EGM2008 gravity data. These refined gravity data mainly comprise information on the Moho interface and mantle lithosphere. Numerical results also reveal that the gravitational contribution of the Earth's crust varies globally from 1,843 to 12,010 mGal. This gravitational signal is strongly correlated with the crustal thickness with its maxima in mountainous regions (Himalayas, Tibetan Plateau and Andes) with the presence of large isostatic compensation. The corresponding minima over the open oceans are due to the thin and heavier oceanic crust.

show abstract

Global Crust-Mantle Density Contrast Estimated from EGM2008, DTM2008, CRUST2.0, and ICE-5G

Cited by 61 publications

References 27 publications

Comparative analysis of Vening-Meinesz Moritz isostatic models using the constant and variable crust-mantle density contrast – a case study of Zealandia

Comparative analysis of Vening-Meinesz Moritz isostatic models using the constant and variable crust-mantle density contrast – a case study of Zealandia

Depth-dependent density change within the continental upper mantle

Spectral harmonic analysis and synthesis of Earth’s crust gravity field

Contact Info

Product

Resources

About