scholarly journals Seismic Structure of the Antarctic Upper Mantle Imaged with Adjoint Tomography

2020 ◽  
Vol 125 (3) ◽  
Author(s):  
A. J. Lloyd ◽  
D. A. Wiens ◽  
H. Zhu ◽  
J. Tromp ◽  
A. A. Nyblade ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Seismic Structure ◽  
Adjoint Tomography ◽  
The Antarctic

scholarly journals Seismic structure of the European upper mantle based on adjoint tomography

2015 ◽  
Vol 201 (1) ◽  
pp. 18-52 ◽  
Author(s):  
Hejun Zhu ◽  
Ebru Bozdağ ◽  
Jeroen Tromp
Keyword(s):  
Upper Mantle ◽  
Seismic Structure ◽  
Adjoint Tomography

scholarly journals The Seismic Structure of the Antarctic Upper Mantle

2021 ◽  
pp. M56-2020-18
Author(s):  
Douglas A. Wiens ◽  
Weisen Shen ◽  
Andrew Lloyd
Keyword(s):  
Upper Mantle ◽  
Spreading Center ◽  
Seismic Velocities ◽  
Seismic Structure ◽  
Amundsen Sea ◽  
Slow Velocity ◽  
History Of ◽  
Dronning Maud Land ◽  
Transantarctic Mountains ◽  
The Antarctic

AbstractThe deployment of seismic stations and the development of ambient noise tomography and new analysis methods provide an opportunity for higher resolution imaging of Antarctica. Here we review recent seismic structure models and describe their implications for the dynamics and history of the Antarctic upper mantle. Results show that most of East Antarctica is underlain by continental lithosphere to depths of ∼ 200 km. The thickest lithosphere is found in a band 500-1000 km west of the Transantarctic Mountains, representing the continuation of cratonic lithosphere with Australian affinity beneath the ice. Dronning Maud Land and the Lambert Graben show much thinner lithosphere, consistent with Phanerozoic lithospheric disruption. The Transantarctic Mountains mark a sharp boundary between cratonic lithosphere and the warmer upper mantle of West Antarctica. In the Southern Transantarctic Mountains, cratonic lithosphere has been replaced by warm asthenosphere, giving rise to Cenozoic volcanism and an elevated mountainous region. The Marie Byrd Land volcanic dome is underlain by slow seismic velocities extending through the transition zone, consistent with a mantle plume. Slow velocity anomalies beneath the coast from the Amundsen Sea Embayment to the Antarctic Peninsula likely result from upwelling of warm asthenosphere during subduction of the Antarctic-Phoenix spreading center.

Shear velocity from differential travel times of short-period ScS-P in New Hebrides, Fiji-Tonga, and Banda Sea regions

1975 ◽  
Vol 65 (6) ◽  
pp. 1787-1796
Author(s):  
Mansur A. Choudhury ◽  
Georges Poupinet ◽  
Guy Perrier
Keyword(s):  
Upper Mantle ◽  
Focal Depth ◽  
Shear Velocity ◽  
Mean Value ◽  
Travel Times ◽  
Velocity Models ◽  
Depth Dependence ◽  
Short Period ◽  
New Hebrides ◽  
The Antarctic

abstract Behavior of P, S and ScS residuals as well as those of differential travel times of ScS-P from the Jeffreys-Bullen tables are analyzed. The phases have been read from short-period records of the Antarctic station, Dumont d'Urville (DRV); the earthquakes originating in New Hebrides, Fiji-Tonga, and Banda Sea regions. P residuals from all regions show a mean value of about −1 sec. On the contrary, S and ScS residuals, well correlated among themselves, show important regional as well as focal-depth dependence. ScS-P residuals from shallow and intermediate shocks are largely positive for New Hebrides and largely negative for Banda Sea; those from intermediate shocks are moderately positive for Fiji-Tonga. The anomalies disappear at depths greater than about 200 km. Upper mantle shear velocity models are presented for the three regions. The models are discussed in relation to a sinking lithosphere.

scholarly journals On the seismic structure of Indian upper-mantle regions

1982 ◽  
Vol 91 (1) ◽  
pp. 1-13
Author(s):  
Avadh Ram ◽  
Om Prakash Singh
Keyword(s):  
Upper Mantle ◽  
Seismic Structure

scholarly journals Crustal and upper mantle seismic structure and lithospheric flexure along the Society Island hotspot chain

2001 ◽  
Vol 147 (1) ◽  
pp. 123-140 ◽  
Author(s):  
Ingo Grevemeyer ◽  
Wilfried Weigel ◽  
Stefan Schüssler ◽  
Felix Avedik
Keyword(s):  
Upper Mantle ◽  
Seismic Structure ◽  
Lithospheric Flexure ◽  
Society Island
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