Seismic anisotropy beneath eastern China from shear wave splitting

Yang, Xiaoyu; Li, Hongyi; Li, Yonghua; Lü, Qingtian; Zhang, Guibing; Jiang, Guoming; Li, Xinfu

doi:10.1093/gji/ggz242

Cited by 32 publications

(47 citation statements)

References 54 publications

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“…However, the anisotropic patterns at the western part are rather complicated. From 40 to 100 s (Figures d–g), the anisotropies in EC and NEC seem to differ from each other but coincide with local shear wave splitting results of Yang et al () and Li et al (), respectively. The area crossing through NEC, CBV, North Korea, and the northwestern part of the SoJ generally shows NW‐SE and NNW‐SSE fast direction patterns, whereas the area crossing through EC, South Korea, Korea Strait, and the southwestern part of the SoJ generally demonstrates W‐E and WNW‐ESE fast direction characteristics.…”

Section: Resultssupporting

confidence: 81%

“…For many other intraplate volcanoes in NE Asia, such as the Chuga‐Ryong volcano (CRV) at the border between North and South Korea and the Ulleung volcano (ULV) ~120 km to the east of KP, fine‐scale seismic structures related to the Late Cenozoic intraplate volcanism have rarely been reported due to sparse distribution of seismic stations in these regions. In addition, mantle flow dynamics in NE Asia revealed by previous shear wave splitting measurements (e.g., Li et al, ; Tono et al, ; Yang et al, ) or anisotropic tomography studies (e.g., Liu & Zhao, , ) are mainly conducted on separated continents, lacking a panoramic view of geodynamics across the entire region. In this study we construct a high‐resolution azimuthally anisotropic Rayleigh‐wave velocity model in NE Asia, by integrating seismic data from China, Japan, South Korea, and recently available data from North Korea, which could provide more constraints and shed some new light on our understanding of the intraplate volcanism and associated mantle dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Intraplate Volcanism and Regional Geodynamics in NE Asia Revealed by Anisotropic Rayleigh‐Wave Tomography

Fan

Chen

Legendre

et al. 2020

Geophysical Research Letters

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Seismic structure related to the magmatic system beneath the potentially hazardous Changbaishan volcano recently becomes hotly debated. In addition, mantle flow dynamics throughout the back‐arc regions in NE Asia remain poorly constrained due to the lack of seismic data in the Korean Peninsula and surrounding ocean regions. In this study we construct a high‐resolution azimuthally anisotropic Rayleigh‐wave phase velocity model in NE Asia, by integrating seismic data from China, North Korea, South Korea, and Japan. The resulting isotropic velocity maps suggest possible existence of a crustal magma chamber beneath the Changbaishan volcano and that the widespread intraplate volcanism in NE Asia likely arises from the upwelling asthenosphere. The obtained anisotropic maps reveal trench‐normal return flow patterns in the back‐arc regions of NE Asia with local variations between East China and northeast China as controlled by the subduction geometry of the Pacific slab.

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Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Intraplate Volcanism and Regional Geodynamics in NE Asia Revealed by Anisotropic Rayleigh‐Wave Tomography

Fan

Chen

Legendre

et al. 2020

Geophysical Research Letters

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“…For an effective measurement, the SKS particle motion changes from ellipse before to linearity after anisotropy removal, and distinct extreme values appear in the contour map. For a null measurement, the SKS particle motion always keeps ellipse after anisotropy removal and the contour map has an unclear extreme value (e.g., Barruol et al, 1997;Qiang et al, 2017;Yang, Li, et al, 2019). We obtain a total of 842 measurements including 768 effective and 74 null splitting results at 192 stations ( Figure 5 and Table S1).…”

Section: Resultsmentioning

confidence: 99%

SKS Splitting Measurements in NE China: New Insights Into the Wudalianchi Intraplate Volcanism and Mantle Dynamics

Lu¹,

Lei²,

Zhao

et al. 2020

JGR Solid Earth

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To better understand the Wudalianchi intraplate volcanism and mantle dynamics in NE China, we collect abundant teleseismic waveform data during 2008 to 2018 recorded at 259 seismic stations around the Wudalianchi volcano. These stations include 148 WAVESArray portable stations, 66 NECESSArray portable stations and 45 Chinese provincial stations. Our newly deployed WAVESArray makes the station intervals of ~20–30 km around the Wudalianchi volcano. Using the minimum transverse‐energy grid‐search method, we make effective SKS splitting measurements at 192 stations. Our results show that the fast direction in the study region is mainly NW‐SE, but there are obvious contrasts within and between different tectonic units. To the east of the North‐South Gravity Lineament, around the Wudalianchi volcano, our SKS splitting measurements show a southeastward opening U‐shaped pattern in the fast direction and splitting time. Such a pattern of seismic anisotropy could be caused by horizontal and vertical flows in the big mantle wedge due to the deep subduction, long stagnancy, and deep dehydration of the Pacific slab in the mantle transition zone. The horizontal flow in the big mantle wedge could be obstructed by the thicker lithosphere under the Great Xing'an range and disturbed by hot and wet upwelling flow under the Wudalianchi volcano. Around the Nuominhe and Halaha volcanic groups, variations in the splitting parameters may also be associated with lithospheric deformation and delamination, though they are located at the edge of our study region. These results shed new light on the intraplate volcanism and mantle dynamics in NE China.

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“…The surface wave anisotropy models YB13SVani (Yuan & Beghein, 2013) are available at https://faculty.epss.ucla.edu/∼cbeghein/ research/global-tomography/sv-anisotropy-mantle-transition-zone. SWS splitting data (Chang et al, 2017;Chen et al, 2017;Li et al, 2018;Qiang et al, 2017;Shi et al, 2015;Yang et al, 2019;Yu & Chen, 2016) can be accessed at https://ds.iris.edu/spud/swsmeasurement/. The data for numerical results of Model 1 and related plotting scripts are available at Zenodo (https://doi.org/10.5281/zenodo.3884294).…”

Section: Discussionmentioning

confidence: 99%

Formation of East Asian Stagnant Slabs Due To a Pressure‐Driven Cenozoic Mantle Wind Following Mesozoic Subduction

Peng

Liu

et al. 2021

Geophysical Research Letters

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The term "stagnant slab" usually refers to the widely distributed fast seismic anomalies within the circum-Pacific mantle transition zones (MTZ) (Fukao et al., 2009;Huang & Zhao, 2006). There are several proposed mechanisms for why slabs can stagnate in the MTZ. The first one is related to the buoyancy associated with phase transformations of major mantle minerals, where both the negative Clapeyron slope of the ringwoodite-bridgmanite transformation (Christensen & Yuen, 1985;Tackley et al., 1993) and the delayed pyroxene-garnet transformation (King et al., 2015) tend to trap the slab within the MTZ. The second one is about the viscosity structure (Gurnis & Hager, 1988), where either a large viscosity increase into the lower mantle or a thin low-viscosity-layer right below the 660 km is invoked (Mao & Zhong, 2018). The third one concerns the age of the subducting plates, where a progressively older subducting slab tends to result in obvious trench retreat and stagnant slabs in the MTZ (Yang et al., 2018). The fourth one is the trench retreat, commonly attributed as an important reason for slab stagnation (Christensen, 1996; van der Hilst & Seno, 1993;Zhong & Gurnis, 1995). Some recent studies suggest the potential role of former subduction (Hu & Gurnis, 2020;Liu et al., 2021), but the dynamic nature remains elusive. There is still no systematic evaluation of these effects using a data-driven thermal-chemical modeling framework.East Asia is an ideal location for studying subduction dynamics and slab stagnation. Numerous tomography models reveal high-velocity seismic anomalies in the MTZ beneath East Asia that are commonly interpreted as stagnant slabs (

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Seismic anisotropy beneath eastern China from shear wave splitting

Cited by 32 publications

References 54 publications

Intraplate Volcanism and Regional Geodynamics in NE Asia Revealed by Anisotropic Rayleigh‐Wave Tomography

Intraplate Volcanism and Regional Geodynamics in NE Asia Revealed by Anisotropic Rayleigh‐Wave Tomography

SKS Splitting Measurements in NE China: New Insights Into the Wudalianchi Intraplate Volcanism and Mantle Dynamics

Formation of East Asian Stagnant Slabs Due To a Pressure‐Driven Cenozoic Mantle Wind Following Mesozoic Subduction

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