2019
DOI: 10.1029/2019gc008373
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Mantle Dynamics of Western Pacific and East Asia: New Insights from P Wave Anisotropic Tomography

Abstract: Seismic anisotropy records past and present tectonic deformations and provides important constraints for understanding the structure and dynamics of the Earth's interior. In this work, we use tremendous amounts of high‐quality P wave arrival times from local and regional earthquakes to determine a high‐resolution tomographic model of 3‐D P wave azimuthal anisotropy down to 1,000‐km depth beneath East Asia. Our results show that trench‐parallel fast‐velocity directions (FVDs) are visible in the shallow portion … Show more

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Cited by 59 publications
(58 citation statements)
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“…On the basis of our present results and previous ones, we propose a dynamic model explaining the deep structure and origin of the Wudalianchi volcano ( Figure 11). The BMW was formed due to the deep subduction, long stagnancy, and deep dehydration of the Pacific slab that is now located in the mantle transition zone under East Asia (e.g., Lei et al, 2013Lei et al, , 2018Lei et al, , 2019Lei et al, , 2020Lei & Zhao, 2005Liu et al, 2017;Ma et al, 2019;Wei et al, 2019;Zhao et al, 2007Zhao et al, , 2009. Strong mantle convection occurs in the BMW, which can cause the NW-SE fast direction of SKS splitting in our study region.…”
Section: 1029/2019jb018575mentioning
confidence: 72%
See 1 more Smart Citation
“…On the basis of our present results and previous ones, we propose a dynamic model explaining the deep structure and origin of the Wudalianchi volcano ( Figure 11). The BMW was formed due to the deep subduction, long stagnancy, and deep dehydration of the Pacific slab that is now located in the mantle transition zone under East Asia (e.g., Lei et al, 2013Lei et al, , 2018Lei et al, , 2019Lei et al, , 2020Lei & Zhao, 2005Liu et al, 2017;Ma et al, 2019;Wei et al, 2019;Zhao et al, 2007Zhao et al, , 2009. Strong mantle convection occurs in the BMW, which can cause the NW-SE fast direction of SKS splitting in our study region.…”
Section: 1029/2019jb018575mentioning
confidence: 72%
“…Our present results suggest that the measurements with large splitting times and NW-SE fast directions on both sides of the U-shaped structure ( Figures 5, 8, 9, and 11) are closely related to horizontal mantle flow, whereas the measurements with small splitting times in the central parts of the U-shaped structure ( Figures 5, 8, 9, and 11) may reflect hot and wet mantle upwelling. Therefore, although our anisotropic results may be related to the dynamics of lithospheric delamination, the main SKS results could be explained by mantle convection and hot mantle upwelling in the BMW due to the deep subduction, long stagnancy, and deep dehydration of the Pacific slab in the mantle transition zone (e.g., Zhao, 2004;Lei & Zhao, 2005Huang & Zhao, 2006;Lei et al, 2013Lei et al, , 2018Lei et al, , 2019Chen, Zhao, et al, 2017;Ma et al, 2019). Figure 11 shows a schematic diagram of the anisotropic structure and dynamics beneath NE China.…”
Section: Cause Of Mantle Anisotropy In Ne Chinamentioning
confidence: 91%
“…Given the presence of a slab window beneath northern Sumatra (Hall & Spakman, ; S. Liu et al, ), the subslab flow enters the mantle wedge through the slab window, resulting in trench‐parallel horizontal mantle flow in the mantle wedge as evidenced by the mostly trench‐parallel fast orientations observed from the local S splitting. Such a flow system has been suggested to account for the anisotropy detected in the mantle wedge above other subducting slabs, such as those in the Alaskan subduction zone (Venereau et al, ) and the subduction of the Pacific slab beneath Japan (Ma et al, ).…”
Section: Discussionmentioning
confidence: 99%
“…As demonstrated by numerous previous studies, understanding the mantle flow field in a subduction system is essential for probing mantle dynamics and comprehending the relationship between surface dynamic processes and mantle deformation associated with plate subduction (e.g., K.H. Liu et al, 2008;Long & Silver, 2009;Long & Wirth, 2013;Ma et al, 2019;Tang et al, 2014;Venereau et al, 2019). The mantle flow system can be readily characterized by the orientation and strength of seismic azimuthal anisotropy (Zhang & Karato, 1995), which is quantifiable by shear wave splitting (SWS) analysis using shear waves originating from local events occurred in the S wave window (e.g., K.H.…”
Section: Introductionmentioning
confidence: 99%
“…However, this approach could have disadvantages, primarily because SKS phases arrive subvertically and are polarized in nearly horizontal directions, which makes them sensitive to horizontal anisotropy only (O'Driscoll et al, 2011). Directly inverting for anisotropy and isotropic velocity (e.g., Eberhart-Phillips & Reyners, 2009;Ma et al, 2019;Wang & Zhao, 2013;Wei et al, 2019;You & Zhao, 2012) would be a solution to overcome some of these limitations. However, data availability issues mainly related to the lack of dense permanent station networks and poor azimuthal coverage make the inversion even more underdetermined, and a loss in resolution is usually the consequence when solving for additional unknowns.…”
Section: Introductionmentioning
confidence: 99%