Anisotropic Pn Tomography of Alaska and Adjacent Regions
Anisotropic Pn Tomography of Alaska and Adjacent Regions
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阿拉斯加及邻近地区的各向异性 Pn 断层扫描
DOI：
10.1029/2021jb022220
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发表时间：
2021-10
期刊：
影响因子：
--
通讯作者：
Yan Lü
中科院分区：
文献类型：
--
作者：
Yuhui He;Yan Lü
我们使用带有坐标旋转的Pn层析成像技术对阿拉斯加及邻近地区进行成像，并获得了一个新的Pn速度和各向异性模型。观测到的Pn速度与当地地质构造有很好的相关性。在……下方观测到低Pn速度。
We use Pn tomography with coordinate rotation to image in Alaska and adjacent areas and obtain a new Pn velocity and anisotropy model. The observed Pn velocities correlate well with the local geological structures. Low Pn velocities are observed beneath the Aleutian volcanic arc, which may reveal partial melting related to plate dehydration. However, it is separated by a distinct high‐velocity anomaly, suggesting a slab tear. The slightly low Pn velocities beneath the Denali volcanic gap suggest that a small amount of magma is produced but is insufficient to form surface volcanoes. We observe sharp bending of the fast directions on the two sides of the northeast edge of the Yakutat Plate, which reveals the plate’s bending. Large‐scale low velocities are observed beneath the northwestern Cordillera, which may be due to the upwelling of hot material from the deep mantle. The Pn fast directions are parallel to the Queen Charlotte‐Fairweather fault system, consistent with the shear strain direction of the faults, reflecting that the influence of the plate boundary is far‐reaching and that the deformation of the crust and the upper mantle is coupled. Our study provides new constraints on the complex deformation beneath Alaska and adjacent areas.
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DOI：
10.1029/2020jb021523
发表时间：
2021-03
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
--
作者：
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影响因子：
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DOI：
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发表时间：
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期刊：
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影响因子：
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