scholarly journals Crustal and uppermost mantle structure in the Middle East: assessing constraints provided by jointly modelling Ps and Sp receiver functions and Rayleigh wave group velocity dispersion curves

2015 ◽  
Vol 201 (2) ◽  
pp. 783-810 ◽  
Author(s):  
Mohit Agrawal ◽  
Jay Pulliam ◽  
Mrinal K. Sen ◽  
Utpal Dutta ◽  
Michael E. Pasyanos ◽  
...  
Keyword(s):  
Middle East ◽  
Rayleigh Wave ◽  
Group Velocity ◽  
Velocity Dispersion ◽  
Group Velocity Dispersion ◽  
Receiver Functions ◽  
Dispersion Curves ◽  
Wave Group ◽  
Mantle Structure ◽  
Uppermost Mantle

3D mantle structure of Central Asia from Rayleigh wave group velocity dispersion

2014 ◽  
Vol 55 (10) ◽  
pp. 1239-1247 ◽  
Author(s):  
V.M. Kozhevnikov ◽  
A.I. Seredkina ◽  
O.A. Solovei
Keyword(s):  
Rayleigh Wave ◽  
Central Asia ◽  
Group Velocity ◽  
Velocity Dispersion ◽  
Group Velocity Dispersion ◽  
Wave Group ◽  
Mantle Structure

One-dimensional Shear Velocity Structure of Northern Africa from Rayleigh Wave Group Velocity Dispersion

2001 ◽  
Vol 158 (8) ◽  
pp. 1475-1493 ◽  
Author(s):  
S. E. Hazler ◽  
A. F. Sheehan ◽  
D. E. McNamara ◽  
W. R. Walter
Keyword(s):  
Rayleigh Wave ◽  
Group Velocity ◽  
Velocity Dispersion ◽  
Velocity Structure ◽  
Group Velocity Dispersion ◽  
Shear Velocity ◽  
Northern Africa ◽  
Wave Group ◽  
One Dimensional

Crustal architecture of Amsterdam-St. Paul Island from an integrated geophysical approach

2021 ◽  
Author(s):  
Pankaj Kumar ◽  
Pratyush Anand ◽  
Dibakar Ghosal ◽  
Pabitra Singha
Keyword(s):  
Magnetic Material ◽  
Rayleigh Wave ◽  
Dispersion Curve ◽  
Group Velocity ◽  
Velocity Dispersion ◽  
Receiver Function ◽  
Group Velocity Dispersion ◽  
Joint Inversion ◽  
Wave Group ◽  
Magnetic Model

<p>The Amsterdam-St. Paul (ASP) island complex is a manifestation of interaction between the South-East Indian Ridge (SEIR) and the ASP mantle plume, which was formed ~10 Ma. Very few geophysical studies have been conducted over the ASP island complex and therefore we have limited information about the island so far. We performed an integrated geophysical approach using gravity, magnetic study along with the joint inversion of Ps receiver function and Rayleigh wave group velocity dispersion curve to determine the crustal architecture and Moho variation in the region. The result of integrated gravity-magnetic modeling revealed that the island complex is associated with three crustal layers beneath the sedimentary strata. Inversion of Rayleigh wave group velocity dispersion curve accounts for vertical shear wave velocity average which supported the layered velocity profile. The results revealed that magnetic material (Mid oceanic ridge basalt/Flood basalt) has carpeted the entire island causing high magnetic anomaly of -1000 to 1500 nT, which is generated by gradual accumulation of a thick pile of magnetic material of normal as well as reverse polarity. The results by integrated Gravity-magnetic model suggest that crust beneath the island is suggested to be highly affected by volcanic activity (Mantle Plume/Ridge) and is underlain by high-density underplated material. The results further suggest that SEIR has less role for the outpoured magmatic activity. Integrated Gravity-magnetic model show that Moho is variable beneath the island complex and lies in the range of ~12-17 km. Further results by joint inversion of Ps receiver function and Rayleigh wave group velocity dispersion curve for the station (AIS : Nouvelle Amsterdam - TAAF, France) suggest Moho depth of ~14 km beneath the Amsterdam island and is well in agreement with the gravity-magnetic studies. The result clearly indicates that ASP island complex is highly affected by the ASP plume activity and was evolved during the ridge-plume interaction.</p>

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