globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116264
论文题名:
Complex upper mantle anisotropy in the Pacific Northwest: Evidence from SKS splitting
作者: Niday W.; Humphreys E.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 540
语种: 英语
中文关键词: asthenosphere ; Pacific Northwest ; seismic anisotropy ; shear wave splitting
英文关键词: Complex networks ; Seismology ; Shear flow ; Shear waves ; Structural geology ; Anisotropy measurements ; Automated methods ; Broad-band seismic stations ; Seismic anisotropy ; Shear wave splitting ; Splitting measurements ; Upper mantle anisotropy ; Velocity structure ; Anisotropy ; automation ; body wave ; complexity ; mantle structure ; seismic anisotropy ; upper mantle ; velocity structure ; wave splitting ; Oregon ; Pacific Ocean ; Pacific Ocean (Northwest) ; United States
英文摘要: We use a dense network of observations and an automated method of analysis to investigate complex patterns of seismic anisotropy in the Pacific Northwest. We present SKS splitting results for approximately 220 broadband seismic stations, including 33 stations from the new Wallowa2 array deployed between 2016 and 2018 in northeast Oregon. Our data set contains approximately 3300 splitting measurements. Our anisotropy measurements indicate that anisotropy in the Pacific Northwest can be divided into two domains: near the subduction zone, anisotropy is perpendicular to the slab; and inboard of the subduction zone anisotropy tends to parallel the velocity structure and is roughly oriented with “absolute” plate motion. However, splitting analysis performs poorly in northeast Oregon, and results are not consistent with uniform or layered anisotropy. We argue that the complex splitting behavior in northern Oregon is a result of spatially variable upper mantle anisotropy, related to the complex upper mantle seismic structure. Interpreting the mantle anisotropy in this region requires methods not limited to standard ray theoretical shear wave splitting analysis. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165183
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作者单位: Department of Earth Sciences, University of Oregon, Eugene, OR 97403-1272, United States

Recommended Citation:
Niday W.,Humphreys E.. Complex upper mantle anisotropy in the Pacific Northwest: Evidence from SKS splitting[J]. Earth and Planetary Science Letters,2020-01-01,540
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