scholarly journals Upper mantle hydration indicated by decreased shear velocity near the Southern Mariana Trench from Rayleigh wave tomography

2021 ◽  
Author(s):  
Gaohua Zhu ◽  
Douglas A. Wiens ◽  
Hongfeng Yang ◽  
Jian Lin ◽  
Min Xu ◽  
...  
Keyword(s):  
Rayleigh Wave ◽  
Upper Mantle ◽  
Shear Velocity ◽  
Mariana Trench ◽  
Wave Tomography ◽  
Rayleigh Wave Tomography

scholarly journals Deep structure of the Hellenic lithosphere from teleseismic Rayleigh-wave tomography

2020 ◽  
Vol 221 (1) ◽  
pp. 205-230 ◽  
Author(s):  
I Kassaras ◽  
V Kapetanidis ◽  
A Karakonstantis ◽  
P Papadimitriou
Keyword(s):  
Rayleigh Wave ◽  
Upper Mantle ◽  
Broad Band ◽  
Shear Velocity ◽  
Velocity Model ◽  
Benioff Zone ◽  
Correlation Technique ◽  
Phase Velocity Dispersion ◽  
Wave Tomography ◽  
Rayleigh Wave Tomography

SUMMARY This research provides new constraints on the intermediate depth upper-mantle structure of the Hellenic lithosphere using a three-step Rayleigh-wave tomography. Broadband waveforms of about 1000 teleseismic events, recorded by ∼200 permanent broad-band stations between 2010 and 2018 were acquired and processed. Through a multichannel cross-correlation technique, the fundamental mode Rayleigh-wave phase-velocity dispersion curves in the period range 30–90 s were derived. The phase-velocities were inverted and a 3-D shear velocity model was obtained down to the depth of 140 km. The applied method has provided 3-D constraints on large-scale characteristics of the lithosphere and the upper mantle of the Hellenic region. Highlighted resolved features include the continental and oceanic subducting slabs in the region, the result of convergence between Adria and Africa plates with the Aegean. The boundary between the oceanic and continental subduction is suggested to exist along a trench-perpendicular line that connects NW Peloponnese with N. Euboea, bridging the Hellenic Trench with the North Aegean Trough. No clear evidence for trench-perpendicular vertical slab tearing was resolved along the western part of Hellenic Subduction Zone; however, subcrustal seismicity observed along the inferred continental–oceanic subduction boundary indicates that such an implication should not be excluded. The 3-D shear velocity model supports an N–S vertical slab tear beneath SW Anatolia that justifies deepening, increase of dip and change of dip direction of the Wadati-Benioff Zone. Low velocities found at depths <50 km beneath the island and the backarc, interrelated with recent/remnant volcanism in the Aegean and W. Anatolia, are explained by convection from a shallow asthenosphere.

scholarly journals A first detailed look at the Greenland lithosphere and upper mantle, using Rayleigh wave tomography

2004 ◽  
Vol 158 (1) ◽  
pp. 267-286 ◽  
Author(s):  
Fiona A. Darbyshire ◽  
Tine B. Larsen ◽  
Klaus Mosegaard ◽  
Trine Dahl-Jensen ◽  
Ólafur Gudmundsson ◽  
...  
Keyword(s):  
Rayleigh Wave ◽  
Upper Mantle ◽  
Wave Tomography ◽  
Rayleigh Wave Tomography

Crustal and upper mantle structure of South China from Rayleigh wave tomography

2016 ◽  
pp. ggw477
Author(s):  
B. Shan ◽  
X. Xiong ◽  
K. F. Zhao ◽  
Z. J. Xie ◽  
Y. Zheng ◽  
...  
Keyword(s):  
Rayleigh Wave ◽  
South China ◽  
Upper Mantle ◽  
Mantle Structure ◽  
Upper Mantle Structure ◽  
Wave Tomography ◽  
Rayleigh Wave Tomography

Crustal and mantle shear velocity structure of Costa Rica and Nicaragua from ambient noise and teleseismic Rayleigh wave tomography

2013 ◽  
Vol 195 (2) ◽  
pp. 1300-1313 ◽  
Author(s):  
Nicholas Harmon ◽  
Mariela Salas De La Cruz ◽  
Catherine Ann Rychert ◽  
Geoffrey Abers ◽  
Karen Fischer
Keyword(s):  
Costa Rica ◽  
Rayleigh Wave ◽  
Ambient Noise ◽  
Velocity Structure ◽  
Shear Velocity ◽  
Wave Tomography ◽  
Rayleigh Wave Tomography

Upper mantle structure of the Tonga-Lau-Fiji region from Rayleigh wave tomography

2016 ◽  
Vol 17 (11) ◽  
pp. 4705-4724 ◽  
Author(s):  
S. Shawn Wei ◽  
Yang Zha ◽  
Weisen Shen ◽  
Douglas A. Wiens ◽  
James A. Conder ◽  
...  
Keyword(s):  
Rayleigh Wave ◽  
Upper Mantle ◽  
Mantle Structure ◽  
Upper Mantle Structure ◽  
Wave Tomography ◽  
Rayleigh Wave Tomography

scholarly journals S wave velocity structure of the Arabian Shield upper mantle from Rayleigh wave tomography

2008 ◽  
Vol 9 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yongcheol Park ◽  
Andrew A. Nyblade ◽  
Arthur J. Rodgers ◽  
Abdullah Al-Amri
Keyword(s):  
Rayleigh Wave ◽  
Wave Velocity ◽  
Upper Mantle ◽  
Velocity Structure ◽  
Arabian Shield ◽  
S Wave ◽  
Wave Tomography ◽  
Rayleigh Wave Tomography
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