期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 23, 页码 10290-10298出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL066593
关键词
-
资金
- NSF [EAR-1315856, CyberSEES-1442665]
- King Abdullah University of Science and Technology (KAUST) [OCRF-2014-CRG3-2300]
- Direct For Computer & Info Scie & Enginr
- Division of Computing and Communication Foundations [1442665] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1315856] Funding Source: National Science Foundation
Seismic structure beneath the contiguous U.S. was imaged with multimode receiver function stacking and inversion of Rayleigh wave dispersion and ellipticity measurements. Crust thickness and elevation are weakly correlated across the contiguous U.S., but the correlation is similar to 3-4 times greater for separate areas east and west of the Rocky Mountain Front (RMF). Greater lower crustal shear velocities east of the RMF, particularly in low-elevation areas with thick crust, are consistent with deep crustal density as the primary cause of the contrasting crust thickness versus elevation trends. Separate eastern and western trends are best fit by Airy isostasy models that assume lower crust to uppermost mantle density increases of 0.18g/cm(3) and 0.40 g/cm(3), respectively. The former value is near the minimum that is plausible for felsic lower crust. Location of the transition at the RMF suggests that Laramide to post-Laramide processes reduced western U.S. lower crustal density.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据