Radial Anisotropy in East Asia From Multimode Surface Wave Tomography

Witek, M.; Chang, Sung‐Joon; Lim, DoYoon; Ning, S.; Ning, Jieyuan

doi:10.1029/2020jb021201

Cited by 12 publications

(3 citation statements)

References 227 publications

(402 reference statements)

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“…The radial anisotropy distribution of the mantle component of SREM-SC is illustrated in Figure 8, which is compatible with the work of Tang et al (2022), who had discussed the similarities and differences between the upper mantle of South China and previous regional and global radial anisotropy models (e.g., Tao et al, 2018;Witek et al, 2021). The study region largely displays positive radial anisotropy at a shallower depth of 60 km (Figure 8A).…”

Section: Radial Anisotropysupporting

confidence: 87%

Seismological reference earth model in South China (SREM-SC): Upper mantle

Tang

Sun²,

Hu³

et al. 2023

Front. Earth Sci.

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This work is the mantle component of constructing the Seismological Reference Earth Model in South China (SREM-SC). Although there has been a wide range of research for imaging the upper mantle structures beneath South China, most of them focus on the large-scale features of the upper mantle, and the depth resolution is insufficient for existing surface wave tomography models to distinguish anomalies below 200 km. This study aims to develop a 3-D upper mantle Seismological Reference Earth Model in South China based on the prior tomography models. The shear wave velocity model comes from the analysis of several seismic surface wave tomography, supplemented by body wave tomography and the P-wave velocity model is constructed by the conversion from S-wave velocity. The radial anisotropy model is calculated from the SV-wave and SH-wave velocity. The Density model of the upper mantle is derived using the empirical relationship linking the density to the shear-wave velocity. The model is grid with 0.5° × 0.5° in latitude and longitude and 5 km interval in depth from 60 to 300 km. The mantle component of Seismological Reference Earth Model in South China is expected to provide a good representation of the upper mantle structures for further detailed studies. The mantle component of Seismological Reference Earth Model in South China provides new insights into upper mantle structures that should be meaningful to reveal the dynamic mechanism and tectonic evolution of South China.

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Section: Radial Anisotropysupporting

confidence: 87%

Seismological reference earth model in South China (SREM-SC): Upper mantle

Tang

Sun²,

Hu³

et al. 2023

Front. Earth Sci.

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“…CU_SDT (Shapiro & Ritzwoller, 2002) proposed a global radial anisotropy model with a 2.0° × 2.0° grid in the uppermost mantle. KEA20 (Witek et al., 2021) built the radial anisotropy model of East Asia in the crust and upper mantle with crustal structures corrected by CRUST1.0 (Laske et al., 2013). SAW642ANb (Panning et al., 2010) described a global radially anisotropic mantle model down to 2,800 km depth with crustal corrections.…”

Section: Resultsmentioning

confidence: 99%

“…Still, most previous surface wave studies have primarily employed fundamental‐mode Rayleigh wave dispersions, and there are only a few regional studies in China using Love wave tomography (Fu et al., 2019). Much of our knowledge of radial anisotropy of the upper mantle in South China comes from broader regional (Tao et al., 2018; Witek et al., 2021) and global radially anisotropic studies (e.g., Kustowski et al., 2008; Panning et al., 2010; Panning & Romanowicz, 2006; Shapiro & Ritzwoller, 2002), despite inconsistencies.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Radial Anisotropy and Its Implications for Upper Mantle Dynamics Beneath South China From Multimode Surface Wave Tomography

et al. 2022

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The South China Block (SCB), located in the southeastern part of the Eurasian continent, comprises the Yangtze Craton in the northwest and the Cathaysia Block in the southeast, as illustrated in Figure 1a. The two major blocks collided and amalgamated in the Neoproterozoic (1.1-1.0 Ga) along the Jiangnan orogen in the center through long-term plate tectonics and multiphase evolution (Faure et al., 2017;Mao et al., 2014;Zhang et al., 2013). The SCB is in a geologic environment with tectonic compression. In the north, the SCB is bounded by the Qinling-Dabie orogen resulting from collision with the North China Craton (NCC) in the Triassic (Cao et al., 2018;Enkin et al., 1992). In the west, the SCB is bordered by the Tibetan Plateau. The SCB is bounded by the Longmenshan Fault, separating it from the Songpan-Ganzi Block in the northwest.

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