EARA2024: A New Radially Anisotropic Seismic Velocity Model for the Crust and Upper Mantle beneath East Asia and Northwestern Pacific Subduction Zones

IF 2.8 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geophysical Journal International Pub Date : 2024-08-23 DOI:10.1093/gji/ggae302
Ziyi Xi, Min Chen, Songqiao Shawn Wei, Jiaqi Li, Tong Zhou, Baoshan Wang, YoungHee Kim
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Abstract

Summary We present a new 3-D radially anisotropic seismic velocity model EARA2024 of the crust and mantle beneath East Asia and the northwestern Pacific using adjoint full-waveform inversion tomography. We construct the EARA2024 model by iteratively minimizing the waveform similarity misfit between the synthetic and observed waveforms from 142 earthquakes recorded by about 2,000 broadband stations in East Asia. Compared to previous studies, this new model renders significantly improved images of the subducted oceanic plate in the upper mantle, mantle transition zone, and uppermost lower mantle along the Kuril, Japan, Izu-Bonin, and Ryukyu Trenches. Complex slab deformation and break-offs are observed at different depths. Moreover, our model provides new insights into the origins of intraplate volcanoes in East Asia, including the Changbaishan, Datong-Fengzhen, Tengchong, and Hainan volcanic fields.
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EARA2024:东亚和西北太平洋俯冲带下地壳和上地幔的新径向各向异性地震速度模型
摘要 我们利用邻接全波形反演层析成像技术,提出了东亚和西北太平洋地壳和地幔下新的三维径向各向异性地震速度模型 EARA2024。我们通过迭代最小化东亚约 2000 个宽带台站记录的 142 次地震的合成波形与观测波形之间的波形相似性失配,构建了 EARA2024 模型。与之前的研究相比,这一新模型明显改善了千岛海沟、日本海沟、伊豆-波宁海沟和琉球海沟沿线上地幔、地幔过渡带和最上层下地幔的俯冲大洋板块图像。在不同深度观测到复杂的板块变形和断裂。此外,我们的模型为东亚板内火山的起源提供了新的见解,包括长白山火山群、大同-丰镇火山群、腾冲火山群和海南火山群。
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来源期刊
Geophysical Journal International
Geophysical Journal International 地学-地球化学与地球物理
CiteScore
5.40
自引率
10.70%
发文量
436
审稿时长
3.3 months
期刊介绍: Geophysical Journal International publishes top quality research papers, express letters, invited review papers and book reviews on all aspects of theoretical, computational, applied and observational geophysics.
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