@article {https://doi.org/10.1029/2019GC008373,
	title = {Mantle Dynamics of Western Pacific and East Asia: New Insights from P Wave Anisotropic Tomography},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {20},
	number = {7},
	year = {2019},
	pages = {3628-3658},
	abstract = {Abstract Seismic anisotropy records past and present tectonic deformations and provides important constraints for understanding the structure and dynamics of the Earth\&$\#$039;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 of the subducting Pacific slab (\&lt;80 km), whereas the deeper portion of the Pacific slab mainly exhibits trench-normal FVDs, except for the stagnant slab in the mantle transition zone (MTZ) where obvious NE-SW FVDs are revealed. The FVDs in the subslab mantle change from a subduction-parallel trend at depths of 80{\textendash}400 km to a subduction-normal trend in the MTZ. Large-scale low-velocity anomalies are revealed beneath the Philippine Sea plate where the FVD is NE-SW. The FVDs along the Izu-Bonin arc and in a slab gap exhibit a striking anticlockwise toroidal trend. All these features may reflect complex 3-D flows in the mantle wedge due to tearing and dehydration processes of the subducting Pacific slab. The subducting Pacific slab is split at ~300-km depth under the Bonin arc and then penetrates into the lower mantle, whereas under East Asia the Pacific slab becomes stagnant in the MTZ and reaches the North-South Gravity Lineament in China. The intraplate volcanoes in East Asia are caused by hot and wet upwelling flows in the big mantle wedge above the stagnant Pacific slab.},
	keywords = {East Asia, intraplate volcanism, mantle dynamics, P wave anisotropic tomography, Pacific plate subduction},
	doi = {https://doi.org/10.1029/2019GC008373},
	url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GC008373},
	author = {Ma, Jincheng and Tian, You and Zhao, Dapeng and Liu, Cai and Liu, Tingting}
}
