A comparison of recent Earth gravitational models with emphasis on their contribution in refining the gravity and geoid at continental or regional scale

Arabelos, D.; Tscherning, C. C.

doi:10.1007/s00190-010-0397-z

Cited by 24 publications

(18 citation statements)

References 11 publications

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“…EGM 2008 is one of the best datasets that cover the entire globe at a high-spatial resolution (Arabelos & Tscherning 2010;Pavlis et al 2012) and is complete up to degree and order 2190 of spherical harmonics of the gravity field. A recent comparison of geoid and gravity suggests that GOCE data have improved our knowledge of the gravity field particularly in two high mountain terrains: the Himalaya and the Andes.…”

Section: Bouguer Anomaly Mapmentioning

confidence: 99%

The lithospheric density structure below the western Himalayan syntaxis: tectonic implications

Tiwari

Mishra

Pandey

2015

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The differences in the tectonic regimes of the western part of the India -Asia collision zone (western Himalayan syntaxis), consisting of the Ladakh-Karakoram, Hindu Kush and Pamir terrains, are examined through the analyses and modelling of gravity anomalies, computed from global gravity model and terrestrial data. Long-wavelength (.450 km) anomalies are related to isostatic compensation and correspond to topographic variations. The short-wavelength gravity highs are primarily due to upthrust blocks and are mostly linked to crustal seismicity. The intermediate depth-focused earthquake region of Hindu Kush-Pamir is characterized by a gravity low probably caused by crustal underthrusting. The deep density structure of the crust and upper mantle constructed from the modelling of gravity anomalies with constraints from seismological information suggests crustal underthrusting of the Indian and the Asian plates in the Hindu Kush-Pamir section unlike that in the Ladakh-Karakoram region, where underthrust Indian lithosphere underplates beneath the Asian plate. The density model supports a hypothesis of slab breakoff of Indian and Eurasian plates in the Ladakh-Karakoram segment, and of the Indian plate in the Hindu Kush-Pamir region, whereas the Eurasian plate drastically underthrusts deeper (c. 200 km), causing deep seismicity in the Hindu Kush-Pamir section.

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Section: Bouguer Anomaly Mapmentioning

confidence: 99%

The lithospheric density structure below the western Himalayan syntaxis: tectonic implications

Tiwari

Mishra

Pandey

2015

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“…The quality and accuracy of EGM2008 was investigated in some regions, but mainly in comparison to GPS and leveling data only. Arabelos and Tscherning [2010] showed a comparison between different regional gravity data sets and global gravity models such as EGM2008. They found that EGM2008 is the best of the tested global gravity models, e. g. the maximum standard deviation between the regional gravity data set and EGM2008 has a value of 18.84 mGal (1 mGal = 1 · 10 −5 m/s 2 ) for Taiwan [ Arabelos and Tscherning , 2010], which is also a Fill‐in region like the Tien Shan.…”

Section: Calculation Of the Crust‐mantle Boundarymentioning

confidence: 99%

“… Arabelos and Tscherning [2010] showed a comparison between different regional gravity data sets and global gravity models such as EGM2008. They found that EGM2008 is the best of the tested global gravity models, e. g. the maximum standard deviation between the regional gravity data set and EGM2008 has a value of 18.84 mGal (1 mGal = 1 · 10 −5 m/s 2 ) for Taiwan [ Arabelos and Tscherning , 2010], which is also a Fill‐in region like the Tien Shan. In general, the standard deviation for most regions is half that of the older EGM96 [ Arabelos and Tscherning , 2010].…”

Section: Calculation Of the Crust‐mantle Boundarymentioning

confidence: 99%

A three‐dimensional Moho depth model for the Tien Shan from EGM2008 gravity data

Steffen

Jentzsch

2011

Tectonics

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[1] The Tien Shan in Central Asia is the largest intracontinental mountain range in the world, but it is 1500 km away from the collision zone between the Indian and Eurasian plates. This region has been and still is the focus of numerous geoscientific studies, mainly because of its evolutionary history and its unique position in the Eurasian lithosphere plate. So far, mainly seismological data have been used to explore the origin of and ongoing seismic activity in this region, but only one study has investigated terrestrial gravity data. In this study, a new gravity data set, EGM2008, is used to determine the crust-mantle boundary (Mohorovičić discontinuity, Moho) of the Tien Shan using inversion of gravity data. In addition, an isostatic Moho is calculated from topographic data, which by comparison to the results of the gravity inversion illuminates the effects of isostatic compensation. The results of the gravity inversion generally agree with results of previous seismic studies and indicate that the Tien Shan has a mountain root with a thickness of about 75 km. Furthermore, the Moho is shallow under the basins, e.g., in the Tarim and Ili basins. The comparison with the isostatic Moho indicates an over-compensation of the orogen and an under-compensation of the basins. The over-compensation results from the former subduction of the Tarim Basin terrane in the south. The under-compensation of the Tarim Basin is generated by support of the terrane between the Tien Shan in the north and the Pamir mountains, Tibet and Himalayas in the south.Citation: Steffen, R., H. Steffen, and G. Jentzsch (2011), A three-dimensional Moho depth model for the Tien Shan from EGM2008 gravity data, Tectonics, 30, TC5019,

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“…The NGA merged the 15′-resolution data set with the data set obtained from topographic estimations to derive a high-resolution gravity map for the fill-in regions [Pavlis et al, 2012]. The quality and accuracy of EGM2008 have been verified in some regions: the maximum standard deviations between EGM2008 and the terrestrial gravity field for Taiwan and China have values of about 19 × 10 À5 and 18 × 10 À5 m/s 2 , respectively, and Taiwan and China are both fill-in regions, as is our study area [Li et al, 2009;Arabelos and Tscherning, 2010]. The accuracy of EGM2008 and the maximum standard deviation between EGM2008 and the terrestrial gravity field for the Korean Peninsula and northeast Asia have not been determined until now.…”

Section: Egm2008 Gravity Fieldmentioning

confidence: 99%

Three‐dimensional density modeling of the EGM2008 gravity field over the Mount Paekdu volcanic area

Choi

Götze

2013

JGR Solid Earth

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[1] Here we use the global gravity field data set EGM2008 for 3-D crustal density modeling of the Mount Paekdu stratovolcano and surrounding area located on the border between North Korea and China. Curvature analysis and Euler deconvolution are used to assist interpretation, and the 3-D model is constrained by multiple geological and geophysical data sets. Mount Paekdu is characterized by a low Bouguer anomaly of À110 × 10 À5 m/s 2 , which is caused by the combined gravity effects of (1) a depth to the Moho of about 40 km, (2) a zone with lower P wave velocity and density than the surrounding, (3) low density volcanic rocks on the surface, and (4) the presence of a magma chamber that has not previously been identified. The modeled magma chamber has a mean thickness of 5 km and a density of about 2350 kg/m 3 and is located <10 km from the surface. Magma chambers are also modeled beneath Mount Wangtian and Mount Nampotae. However, the results of the 3-D density modeling do not confirm the existence of a previously proposed midcrustal low-velocity zone in the area 70 km to the north of Mount Paekdu. Since the Pliocene, volcanic activity in the Mount Paekdu region has migrated from the east coast of North Korea to the northwest, following the path of NW-SE trending faults.

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A comparison of recent Earth gravitational models with emphasis on their contribution in refining the gravity and geoid at continental or regional scale

Cited by 24 publications

References 11 publications

The lithospheric density structure below the western Himalayan syntaxis: tectonic implications

The lithospheric density structure below the western Himalayan syntaxis: tectonic implications

A three‐dimensional Moho depth model for the Tien Shan from EGM2008 gravity data

Three‐dimensional density modeling of the EGM2008 gravity field over the Mount Paekdu volcanic area

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