The Waqf as Suwwan crater, Eastern Desert of Jordan: aspects of the deep structure of an oblique impact from reflection seismic and gravity data

2013 ◽  
Vol 103 (1) ◽  
pp. 233-252 ◽  
Author(s):  
Till Heinrichs ◽  
Elias Salameh ◽  
Hani Khouri
Keyword(s):  
Deep Structure ◽  
Gravity Data ◽  
Eastern Desert ◽  
Oblique Impact ◽  
Reflection Seismic

scholarly journals Current knowledge on the crustal properties of Italy

1994 ◽  
Vol 37 (5 Sup.) ◽  
Author(s):  
C. Morelli
Keyword(s):  
Adriatic Sea ◽  
Current Knowledge ◽  
Gravity Data ◽  
Maximum Depth ◽  
Gravity Models ◽  
Tyrrhenian Sea ◽  
Po Plain ◽  
Reflection Seismic ◽  
Adriatic Plate ◽  
The North

The recent advances in experimental petrography together with the information derived from the super-deep drilling projects have provided additional constraints for the interpretation of refraction and reflection seismic data. These constraints can also be used in the interpretation of magnetic and gravity data to resolve nonuniqueness. In this study, we re-interpret the magnetic and gravity data of the Italian peninsula and neighbouring areas. In view of the constraints mentioned above, it is now possible to find an agreement between the seismic and gravity models of the Central Alps. By taking into account the overall crustal thickness, we have recognized the existence of three types of Moho: 1) European which extends to the north and west of the peninsula and in the Corsican-Sardinian block. Its margin was the foreland in the Alpine Orogeny and it was the ramp on which European and Adriatic mantle and crustal slices were overthrusted. This additional load caused bending and deepening and the Moho which now lies beneath the Adriatic plate reaching a maximum depth of approximately 75 km. 2) Adriatic (or African) which lies beneath the Po plain, the Apennines and the Adriatic Sea. The average depth of the Moho is about 30-35 km below the Po plain and the Adriatic Sea and it increases toward the Alps and the Tyrrhenian Sea (acting as foreland along this margin). The maximum depth (50 km) is reached in Calabria. 3) Pery-Tyrrhenian. This is an oceanic or thinned continental crust type of Moho. It borders the oceanic Moho of the Tyrrhenian Sea and it acquires a transitional character in the Ligurian and Provençal basins (<15 km thickness) while further thickening occurs toward the East where the Adriatic plate is overthrusted. In addition, the interpretation of the heat flow data appears to confirm the origin of this Moho and its geodynamic allocation.

scholarly journals Deep structure of the Grenada Basin from wide‐angle seismic, bathymetric and gravity data

2020 ◽  
Author(s):  
Crelia Padron ◽  
Frauke Klingelhoefer ◽  
Boris Marcaillou ◽  
Jean‐Frédéric Lebrun ◽  
Serge Lallemand ◽  
...  
Keyword(s):  
Deep Structure ◽  
Gravity Data ◽  
Wide Angle

scholarly journals Deep Structure of the North Natal Valley (Mozambique) Using Combined Wide‐Angle and Reflection Seismic Data

2021 ◽  
Vol 126 (4) ◽  
Author(s):  
A. Leprêtre ◽  
P. Schnürle ◽  
M. Evain ◽  
F. Verrier ◽  
D. Moorcroft ◽  
...  
Keyword(s):  
Seismic Data ◽  
Deep Structure ◽  
Wide Angle ◽  
Reflection Seismic ◽  
The North

scholarly journals Bifurcation in the history of Uranus and Neptune: the role of giant impacts

2019 ◽  
Vol 492 (4) ◽  
pp. 5336-5353 ◽  
Author(s):  
Christian Reinhardt ◽  
Alice Chau ◽  
Joachim Stadel ◽  
Ravit Helled
Keyword(s):  
High Resolution ◽  
Heat Source ◽  
Gravity Data ◽  
Internal Heat ◽  
Internal Heat Source ◽  
Oblique Impact ◽  
Deep Interior ◽  
History Of ◽  
Giant Impacts

ABSTRACT Despite many similarities, there are significant observed differences between Uranus and Neptune: While Uranus is tilted and has a regular set of satellites, suggesting their accretion from a disc, Neptune’s moons are irregular and are captured objects. In addition, Neptune seems to have an internal heat source, while Uranus is in equilibrium with solar insulation. Finally, structure models based on gravity data suggest that Uranus is more centrally condensed than Neptune. We perform a large suite of high-resolution SPH simulations to investigate whether these differences can be explained by giant impacts. For Uranus, we find that an oblique impact can tilt its spin axis and eject enough material to create a disc where the regular satellites are formed. Some of the discs are massive and extended enough, and consist of enough rocky material to explain the formation of Uranus’ regular satellites. For Neptune, we investigate whether a head-on collision could mix the interior, and lead to an adiabatic temperature profile, which may explain its larger flux and higher moment of inertia value. We find that massive and dense projectiles can penetrate towards the centre and deposit mass and energy in the deep interior, leading to a less centrally concentrated interior for Neptune. We conclude that the dichotomy between the ice giants can be explained by violent impacts after their formation.

Deep structure and tectonics of the burmese arc: constraints from earthquake and gravity data

1988 ◽  
Vol 149 (3-4) ◽  
pp. 299-322 ◽  
Author(s):  
Manoj Mukhopadhyay ◽  
Sujit Dasgupta
Keyword(s):  
Deep Structure ◽  
Gravity Data

scholarly journals Deep structure of the West African continental margin (Congo, Zaïre, Angola), between 5°S and 8°S, from reflection/refraction seismics and gravity data

2004 ◽  
Vol 158 (2) ◽  
pp. 529-553 ◽  
Author(s):  
Isabelle Contrucci ◽  
Luis Matias ◽  
Maryline Moulin ◽  
Louis Géli ◽  
Frauke Klingelhofer ◽  
...  
Keyword(s):  
Continental Margin ◽  
Deep Structure ◽  
Gravity Data ◽  
West African ◽  
The West ◽  
Refraction Seismics

scholarly journals Localized foundering of Indian lower crust in the India–Tibet collision zone

2020 ◽  
Vol 117 (40) ◽  
pp. 24742-24747
Author(s):  
Danian Shi ◽  
Simon L. Klemperer ◽  
Jianyu Shi ◽  
Zhenhan Wu ◽  
Wenjin Zhao
Keyword(s):  
Lower Crust ◽  
Gravitational Instability ◽  
Deep Structure ◽  
Receiver Function ◽  
Gravity Data ◽  
Normal Faults ◽  
Satellite Gravity ◽  
Crust And Upper Mantle ◽  
Collision Zone ◽  
Dehydration Reactions

The deep structure of the continental collision between India and Asia and whether India’s lower crust is underplated beneath Tibet or subducted into the mantle remain controversial. It is also unknown whether the active normal faults that facilitate orogen-parallel extension of Tibetan upper crust continue into the lower crust and upper mantle. Our receiver-function images collected parallel to the India–Tibet collision zone show the 20-km-thick Indian lower crust that underplates Tibet at 88.5–92°E beneath the Yarlung-Zangbo suture is essentially absent in the vicinity of the Cona-Sangri and Pumqu-Xainza grabens, demonstrating a clear link between upper-crustal and lower-crustal thinning. Satellite gravity data that covary with the thickness of Indian lower crust are consistent with the lower crust being only ∼30% eclogitized so gravitationally stable. Deep earthquakes coincide with Moho offsets and with lateral thinning of the Indian lower crust near the bottom of the partially eclogitized Indian lower crust, suggesting the Indian lower crust is locally foundering or stoping into the mantle. Loss of Indian lower crust by these means implies gravitational instability that can result from localized rapid eclogitization enabled by dehydration reactions in weakly hydrous mafic granulites or by volatile-rich asthenospheric upwelling directly beneath the two grabens. We propose that two competing processes, plateau formation by underplating and continental loss by foundering or stoping, are simultaneously operating beneath the collision zone.

scholarly journals Combined Gravimetric-Seismic Moho Model of Tibet

Geosciences ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 461 ◽  
Author(s):  
Alexey Baranov ◽  
Mohammad Bagherbandi ◽  
Robert Tenzer
Keyword(s):  
Ocean Circulation ◽  
Seismic Data ◽  
Deep Structure ◽  
Gravity Data ◽  
Satellite Observation ◽  
Shuttle Radar Topography Mission ◽  
Moho Depth ◽  
The Tibetan Plateau ◽  
Local Maxima ◽  
Topographic Data

Substantial progress has been achieved over the last four decades to better understand a deep structure in the Himalayas and Tibet. Nevertheless, the remoteness of this part of the world still considerably limits the use of seismic data. A possible way to overcome this practical restriction partially is to use products from the Earth’s satellite observation systems. Global topographic data are provided by the Shuttle Radar Topography Mission (SRTM). Global gravitational models have been derived from observables delivered by the gravity-dedicated satellite missions, such as the Gravity Recovery and Climate Experiment (GRACE) and the Gravity field and steady-state Ocean Circulation Explorer (GOCE). Optimally, the topographic and gravity data should be combined with available results from tomographic surveys to interpret the lithospheric structure, including also a Moho relief. In this study, we use seismic, gravity, and topographic data to estimate the Moho depth under orogenic structures of the Himalayas and Tibet. The combined Moho model is computed based on solving the Vening Meinesz–Moritz (VMM) inverse problem of isostasy, while incorporating seismic data to constrain the gravimetric solution. The result of the combined gravimetric-seismic data analysis exhibits an anticipated more detailed structure of the Moho geometry when compared to the solution obtained merely from seismic data. This is especially evident over regions with sparse seismic data coverage. The newly-determined combined Moho model of Tibet shows a typical contrast between a thick crustal structure of orogenic formations compared to a thinner crust of continental basins. The Moho depth under most of the Himalayas and the Tibetan Plateau is typically within 60–70 km. The maximum Moho deepening of ~76 km occurs to the south of the Bangong-Nujiang suture under the Lhasa terrane. Local maxima of the Moho depth to ~74 km are also found beneath Taksha at the Karakoram fault. This Moho pattern generally agrees with the findings from existing gravimetric and seismic studies, but some inconsistencies are also identified and discussed in this study.

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