DOI: 10.1016/j.epsl.2018.05.012
Scopus记录号: 2-s2.0-85047194577
论文题名: Lithospheric layering beneath the contiguous United States constrained by S-to-P receiver functions
作者: Liu L. ; Gao S.S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 495 起始页码: 79
结束页码: 86
语种: 英语
英文关键词: continental crust
; lithosphere
; lithospheric thickness
; receiver function
Scopus关键词: Mica
; Seismographs
; Tectonics
; Broad-band seismic stations
; Continental crusts
; Gulf coastal plains
; lithosphere
; Lithospheric thickness
; Receiver functions
; Seismic discontinuities
; Seismic tomography
; Seismology
; continental crust
; lithosphere
; lithospheric structure
; mantle discontinuity
; P-wave
; S-wave
英文摘要: To image upper mantle seismic discontinuities beneath the contiguous United States, a total of 284,121 S-to-P receiver functions (SRFs) recorded by 3,594 broadband seismic stations in the EarthScope Transportable Array and other permanent and temporary deployments are stacked in circular bins of 2° in radius. A robust negative arrival, representing a sharp discontinuity of wave speed reduction with depth, is visible in virtually all the stacked traces in the depth range of 30–110 km. Beneath the western U.S., the mean depth of this discontinuity is 69±17 km, and beneath the eastern U.S., it is 76±5 km, both are comparable to the depth of the tomographically-determined lithosphere–asthenosphere boundary (LAB). In contrast, the depth of the discontinuity beneath the stable cratonic region of the central U.S. is 87±6 km, which is significantly shallower than the ∼250 km LAB depth determined by seismic tomography. Based on the amplitude of the corresponding arrival in the SRFs and findings from previous seismic tomography and mantle xenolith studies, this discontinuity beneath the central U.S. is interpreted as the top of an intra-lithospheric low wave speed, probably phlogopite-rich layer. The observations provide new constraints on a number of regional scale tectonic processes, such as lithospheric stretching in the Texas–Louisiana Gulf Coastal Plain and the Basin and Range Province, and possible lithospheric basal erosion beneath the northeastern U.S. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109826
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO 65409, United States
Recommended Citation:
Liu L.,Gao S.S.. Lithospheric layering beneath the contiguous United States constrained by S-to-P receiver functions[J]. Earth and Planetary Science Letters,2018-01-01,495