Complex Patterns of Mantle Flow in Eastern SE Asian Subduction Zones Inferred From P‐Wave Anisotropic Tomography

Wei, Wei; Zhao, Dapeng; Yu, Weiqian

doi:10.1029/2021jb023366

Cited by 16 publications

(21 citation statements)

References 72 publications

(137 reference statements)

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“…To determine a 3‐D AAN tomographic model beneath the CEUS, we apply the method of Wang and Zhao (2008, 2013) to our data set. This method has been successfully applied to many regions, including NE Asia (e.g., Liang, Zhao, Xu, & Hua, 2022; Ma et al., 2019; Zhao, 2021), SE Asia (e.g., Hua et al., 2022; Huang et al., 2015; Wei et al., 2022), southern Europe (Hua et al., 2017; Wei et al., 2019), and the western‐central US (Huang & Zhao, 2013; Zhao & Hua, 2021). The advantage of this method is that isotropic V p parameters, anisotropic parameters, and hypocentral parameters of local earthquakes can be determined simultaneously because the travel‐time data are sensitive to these parameters in the same order (Zhao et al., 2016).…”

Section: Azimuthal Anisotropy Tomographymentioning

confidence: 99%

Seismic Anisotropy Tomography and Mantle Dynamics of Central‐Eastern USA

et al. 2022

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We present high‐resolution 3‐D tomographic models of isotropic P‐wave velocity (Vp), azimuthal anisotropy, and radial anisotropy down to 1,300 km depth beneath the central and eastern United States (CEUS), which are obtained by inverting a great number of local and teleseismic data and making a whole‐mantle correction to teleseismic travel‐time data recorded by the USArray. Trade‐offs between azimuthal and radial anisotropies occur due to the correlation between the azimuthal and incidence angles of seismic rays, but the use of uniform and crisscrossing rays can reduce the trade‐off effect. Our tomographic images reveal the North American Craton with layered anisotropy and strong anisotropies in the lower mantle related to the deeply subducted Farallon slab and passage of the Bermuda hotspot. In the upper mantle, low‐velocity anomalies with significant seismic anisotropy are revealed beneath three intraplate seismic zones in New Madrid, East Tennessee, and South Carolina, suggesting that hot and wet mantle upwelling occurs under the seismic zones, and the related fluids affect the earthquake generation. The most important dynamic processes in the mantle beneath the CEUS are the deep subduction of the Farallon plate and the passage of the Bermuda hotspot, which have caused strong structural heterogeneities, seismic anisotropy, as well as thermal anomalies and fluids that contributed to the formation of intraplate seismic zones in the CEUS.

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Section: Azimuthal Anisotropy Tomographymentioning

confidence: 99%

Seismic Anisotropy Tomography and Mantle Dynamics of Central‐Eastern USA

et al. 2022

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“…Our results show clearly arc-shaped high-V anomalies at depths of ∼50-400 km below the Banda arc (Figures 2 and 3), representing the subducting Indo-Australian slab, that is, the Banda slab. Taking into account previous large-scale tomographic images (e.g., Hua et al, 2022;Huang et al, 2015;Spakman & Hall, 2010;Wei et al, 2022;Widiyantoro & Hilst, 1997), we suggest that the subducted slab is trapped within the mantle transition zone (MTZ). Note that only local earthquake arrival-time data are used in this study, so our model depth is limited by the distribution of local deep earthquakes.…”

Section: Slab Geometriesmentioning

confidence: 66%

P and S Wave Anisotropic Tomography of the Banda Subduction Zone

Hua,

Zhao,

2023

Geophysical Research Letters

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In subduction zones with slab‐slab interactions, the pattern of mantle convection is very complex and still unclear. In this study, we jointly invert a large number of P and S wave arrival time data of local earthquakes for 3‐D isotropic and anisotropic velocity structures of the Banda subduction zone. Along the curved Banda arc, the subducting Indo‐Australian slab is detected clearly as a high‐velocity zone, and its azimuthal anisotropy changes along the arc strike, representing fossil anisotropy within the slab and modified anisotropy by the subduction processes. Around the northern edge of the Banda slab, a semi‐toroidal pattern of anisotropy appears in low‐velocity anomalies, representing mantle flow extruded from the Banda arc and escaped from a gap of the Banda‐Molucca slab toward the northeast. Our 3‐D anisotropic tomography uncovers the mantle convection pattern induced by the slab‐slab interactions, shedding new light on the complex dynamical processes in this curved subduction zone.

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“…Seismic imaging has become a crucial tool for studying the interior structure of the Earth. To date, many tomographic studies have been made to investigate the 3‐D velocity structure of the crust and upper mantle beneath the PSP region (e.g., Becker et al., 2012; Isse et al., 2004, 2006, 2009, 2010; Ma, Tian, et al., 2019; Shi et al., 2020, 2021; Wei et al., 2012, 2022). Mishra et al.…”

Section: Introductionmentioning

confidence: 99%

Slab Morphology Around the Philippine Sea: New Insights From P‐Wave Mantle Tomography

et al. 2023

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The Philippine Sea Plate (PSP) is located at the intersection of the Eurasian, Pacific and Indo-Australian plates, and is almost entirely surrounded by subduction zones (Zhang et al., 2016). The PSP eastern boundary is the Izu-Bonin, Mariana, Yap, and Palau trenches and the Ayu Trough. The PSP western border is the Nankai Trough and the Ryukyu, Manila, and Philippine trenches. The Kyushu-Palau Ridge divides the Philippine Sea Basin into the West Philippine Basin and the Shikoku-Parece Vela Basin. The latter is further divided into the Shikoku Basin (SB) in the north and the Parece Vela Basin (PVB) in the south by the Sovgan Fault. In the easternmost part of the PSP, the Izu-Bonin-Mariana (IBM) block is composed of the Izu-Bonin and Mariana islands arcs (Figure 1). The PSP has rotated clockwise three times during 40-50 (or 55) Ma, 5-25 Ma, and 0-5 Ma Hall, Fuller et al., 1995;Sdrolias et al., 2004), and then expanded to its present form with complex structures and tectonics. The PSP is a complex region where the bathymetry, plate shape and seafloor age have undergone significant changes (Müller et al., 2008;Yamazaki et al., 2010). The PSP has become one of the major research targets in geosciences because of its special geological location and complex tectonic features.Seismic imaging has become a crucial tool for studying the interior structure of the Earth. To date, many tomographic studies have been made to investigate the 3-D velocity structure of the crust and upper mantle beneath the PSP region (e.g.,

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Complex Patterns of Mantle Flow in Eastern SE Asian Subduction Zones Inferred From P‐Wave Anisotropic Tomography

Cited by 16 publications

References 72 publications

Seismic Anisotropy Tomography and Mantle Dynamics of Central‐Eastern USA

Seismic Anisotropy Tomography and Mantle Dynamics of Central‐Eastern USA

P and S Wave Anisotropic Tomography of the Banda Subduction Zone

Slab Morphology Around the Philippine Sea: New Insights From P‐Wave Mantle Tomography

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