A new isostatic model of the lithosphere and gravity field

Kaban, Mikhail K.; Schwintzer, P.; Reigber, Ch.

doi:10.1007/s00190-004-0401-6

Cited by 117 publications

(113 citation statements)

References 31 publications

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…Kaban et al (1999) demonstrated that the isostatic compensation does not take place only within the Earth crust but essentially also within the lithospheric mantle. This finding was later also confirmed by Kaban et al (2004) and Tenzer et al (2009Tenzer et al ( , 2012. These phenomena thus somehow limit a realistic estimation of the Moho parameters based on using only gravity data.…”

Section: Discussionmentioning

confidence: 55%

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

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: 55%

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

View full text Add to dashboard Cite

show abstract

“…Different estimates were given in earlier studies. Zhong (1997) reported on long wavelengths larger than 800 km, Sjöberg (1998) Kaban et al 2003Kaban et al , 2004. The tectonic plate collision in our study area could be the main reason for uncertainties in the gravimetrically determined Moho depths.…”

Section: Regional Moho Modelmentioning

confidence: 74%

“…Bagherbandi (2011) demonstrated that the isostatic equilibrium can be attained using a variable Moho geometry only at a long-wavelength spectrum approximately up to a spherical harmonic degree of 60 (which corresponds to a half-wavelength of 3 arc-deg, or about 330 km on the Equator). Similarly, Kaban et al (1999Kaban et al ( , 2004 concluded that the validity of isostatic models is limited mostly to spatial wavelengths not shorter than 500 km. Different estimates were given in earlier studies.…”

Section: Regional Moho Modelmentioning

confidence: 99%

The Sub-Crustal Stress Field in the Taiwan Region

Tenzer¹,

Eshagh²

2015

Terr. Atmos. Ocean. Sci.

View full text Add to dashboard Cite

We investigate the sub-crustal stress in the Taiwan region. A tectonic configuration in this region is dominated by a collision between the Philippine oceanic plate and the Eurasian continental margin. The horizontal components of the sub-crustal stress are computed based on the modified Runcorn's formulae in terms of the stress function with a subsequent numerical differentiation. This modification increases the (degree-dependent) convergence domain of the asymptotically-convergent series and consequently allows evaluating the stress components to a spectral resolution, which is compatible with currently available global crustal models. Moreover, the solution to the Vening Meinesz-Moritz's (VMM) inverse isostasy problem is explicitly incorporated in the stress function definition. The sub-crustal stress is then computed for a variable Moho geometry, instead of assuming only a constant Moho depth. The regional results reveal that the Philippine plate subduction underneath the Eurasian continental margin generates the shear sub-crustal stress along the Ryukyu Trench. Some stress anomalies associated with this subduction are also detected along both sides of the Okinawa Trough. A tensional stress along this divergent tectonic plate boundary is attributed to a back-arc rifting. The sub-crustal stress, which is generated by a (reverse) subduction of the Eurasian plate under the Philippine plate, propagates along both sides of the Luzon (volcanic) Arc. This stress field has a prevailing compressional pattern.

show abstract

“…There are several different geophysical phenomena (such as glacial isostatic adjustment, plate flexure, crustal rigidity, plate motion, mantle convection/thermal compensation) which can also be interpreted by means of gravity field analysis. For more information we refer readers to studies by Kaban et al (1999Kaban et al ( , 2003Kaban et al ( , 2004, Watts (2001, p. 114), Braitenberg et al (2006), Wienecke et al (2007), Tenzer et al (2009aTenzer et al ( , 2012b, Bagherbandi and Sjöberg (2012), Negretti et al (2012), and others.…”

Section: Introductionmentioning

confidence: 99%

Effect of Crustal Density Structures on GOCE Gravity Gradient Observables

Tenzer¹,

Novák²

2013

Terr. Atmos. Ocean. Sci.

View full text Add to dashboard Cite

We investigate the gravity gradient components corrected for major known anomalous density structures within the Earth's crust. Heterogeneous mantle density structures are disregarded. The gravimetric forward modeling technique is utilized to compute the gravity gradients based on methods for a spherical harmonic analysis and synthesis of a gravity field. The Earth's gravity gradient components are generated using the global geopotential model GOCO-03s. The topographic and stripping gravity corrections due to the density contrasts of the ocean and ice are computed from the global topographic/bathymetric model DTM2006.0 (which also includes the ice-thickness dataset). The discrete data of sediments and crust layers taken from the CRUST2.0 global crustal model are then used to apply the additional stripping corrections for sediments and remaining anomalous crustal density structures. All computations are realized globally on a one arc-deg geographical grid at a mean satellite elevation of 255 km. The global map of the consolidated crust-stripped gravity gradients reveals distinctive features which are attributed to global tectonics, lithospheric plate configuration, lithosphere structure and mantle dynamics (e.g., glacial isostatic adjustment, mantle convection). The Moho signature, which is the most pronounced signal in these refined gravity gradients, is superimposed over a weaker gravity signal of the lithospheric mantle. An interpretational quality of the computed (refined) gravity gradient components is mainly limited by a low accuracy and resolution of the CRUST2.0 sediment and crustal layer data and unmodeled mantle structures.

show abstract

A new isostatic model of the lithosphere and gravity field

Cited by 117 publications

References 31 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

The Sub-Crustal Stress Field in the Taiwan Region

Effect of Crustal Density Structures on GOCE Gravity Gradient Observables

Contact Info

Product

Resources

About