气候变化领域集成服务门户(CCPortal): Multifrequency Inversion of Ps and Sp Receiver Functions: Methodology and Application to USArray Data

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DOI	10.1029/2020JB020350
	Multifrequency Inversion of Ps and Sp Receiver Functions: Methodology and Application to USArray Data
	Bissig F.; Khan A.; Tauzin B.; Sossi P.A.; Munch F.D.; Giardini D.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	We image the thermochemical structure of crust and mantle underneath the North American continent by inverting recordings of P-to-s (Ps) and S-to-p (Sp) converted seismic body waves (receiver functions [RFs]). Through careful data selection and processing, we construct a multifrequency Ps (5-, 8-, and 10 -s) and Sp (10- and 15- s) RF data set from USArray recordings. The inversion is interfaced with petrological phase equilibria computations to build self-consistent radial seismic velocity and density models for RF waveform simulations. Inverted models are combined through back-projection along converted raypaths and interpolation to tomographic images of crust and mantle structure. Through clustering analysis we identify three major tectonic regions based on mantle thermochemical and seismic structure: the tectonically active West (TAW), the central transition region (CTR), and the cratonic-orogenic East (COE). TAW is chemically more fertile with a Mg# ∼ 0.90 (molar Mg# = Mg/(Mg + Fe)) and characterized by an elevated mantle potential temperature of 1490 ± 27°C relative to COE, which is chemically more depleted (Mg# ∼ 0.91) and colder (1419 ± 27°C). CTR is intermediate to TAW and COE. We find significant thermochemically induced topography associated with the base of the lithosphere (±90 km), while the mantle transition zone is mostly influenced by thermally induced topography on the 410-km discontinuity (±15 km). In contrast, the 660-km discontinuity, where variations are only ±5 km, reflects a more complex thermochemical interplay. To place the results in a tectonic context, thermobarometric estimates from basaltic rocks across the western United States are integrated with the seismic inversions to produce a thermal model of the underlying mantle. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	mantle thermochemistry; North America; receiver functions; seismology
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187356
作者单位	Institute of Geophysics, ETHZ, Zürich, Switzerland; Institute of Theoretical Physics, University of Zürich, Zürich, Switzerland; Research School of Earth Sciences, ANU, Canberra, Australia; Université de Lyon, Université Claude Bernard Lyon 1, ENS, CNRS, Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement, Villeurbanne, France; Institute of Geochemistry and Petrology, ETHZ, Zürich, Switzerland; Department of Earth and Planetary Science, University of California, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Bissig F.,Khan A.,Tauzin B.,et al. Multifrequency Inversion of Ps and Sp Receiver Functions: Methodology and Application to USArray Data[J],2021,126(2).
APA	Bissig F.,Khan A.,Tauzin B.,Sossi P.A.,Munch F.D.,&Giardini D..(2021).Multifrequency Inversion of Ps and Sp Receiver Functions: Methodology and Application to USArray Data.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Bissig F.,et al."Multifrequency Inversion of Ps and Sp Receiver Functions: Methodology and Application to USArray Data".Journal of Geophysical Research: Solid Earth 126.2(2021).