DOI: 10.1002/2015GL066593
论文题名: Distinct crustal isostasy trends east and west of the Rocky Mountain Front
作者: Schmandt B. ; Lin F.-C. ; Karlstrom K.E.
刊名: Geophysical Research Letters
ISSN: 0094-8341
EISSN: 1944-8072
出版年: 2015
卷: 42, 期: 23 起始页码: 10290
结束页码: 10298
语种: 英语
英文关键词: continental crust
; isostasy
; lower crust
; North America
Scopus关键词: Shear flow
; Continental crusts
; Ellipticity measurements
; Isostasy
; Lower crust
; Multi-mode receivers
; North America
; Rayleigh-wave dispersion
; Seismic structure
; Geodesy
; continental crust
; crustal thickness
; isostasy
; Laramide orogeny
; lower crust
; Rayleigh wave
; seismic survey
; seismic velocity
; Rocky Mountains
; United States
英文摘要: 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 ∼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 0.18 g/cm3 and 0.40 g/cm3, 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. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953636376&doi=10.1002%2f2015GL066593&partnerID=40&md5=c009457d546141fa111a1c577db4bd39
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7957
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Earth and Planetary Sciences Department, University of New Mexico, Albuquerque, NM, United States
Recommended Citation:
Schmandt B.,Lin F.-C.,Karlstrom K.E.. Distinct crustal isostasy trends east and west of the Rocky Mountain Front[J]. Geophysical Research Letters,2015-01-01,42(23).