气候变化领域集成服务门户(CCPortal): New Approaches to Multifrequency Sp Stacking Tested in the Anatolian Region

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DOI	10.1029/2020JB020313
	New Approaches to Multifrequency Sp Stacking Tested in the Anatolian Region
	Hua J.; Fischer K.M.; Wu M.; Blom N.A.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	This study presents an improved approach to common-conversion point stacking of converted body waves that incorporates scattering kernels, accurate and efficient measurement of stack uncertainties, and an alternative method for estimating free surface seismic velocities. To better separate waveforms into the P and SV components to calculate receiver functions, we developed an alternative method to measure near-surface compressional and shear wave velocities from particle motions. To more accurately reflect converted phase scattering kernels in the common-conversion point stack, we defined new weighting functions to project receiver function amplitudes only to locations where sensitivities to horizontal discontinuities are high. To better quantify stack uncertainties, we derived an expression for the standard deviation of the stack amplitude that is more efficient than bootstrapping and can be used for any problem requiring the standard deviation of a weighted average. We tested these improved methods on Sp phase data from the Anatolian region, using multiple band-pass filters to image velocity gradients of varying depth extents. Common conversion point stacks of 23,787 Sp receiver functions demonstrate that the new weighting functions produce clearer and more continuous mantle phases, compared to previous approaches. The stacks reveal a positive velocity gradient at 80–150 km depth that is consistent with the base of an asthenospheric low-velocity layer. This feature is particularly strong in stacks of longer period data, indicating it represents a gradual velocity gradient. At shorter periods, a lithosphere-asthenosphere boundary phase is observed at 60–90 km depth, marking the top of the low-velocity layer. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Anatolia; asthenosphere; frequency dependence; receiver function; scattering kernel; uncertainty quantification
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/187490
作者单位	Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, United States; Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Hua J.,Fischer K.M.,Wu M.,et al. New Approaches to Multifrequency Sp Stacking Tested in the Anatolian Region[J],2020,125(11).
APA	Hua J.,Fischer K.M.,Wu M.,&Blom N.A..(2020).New Approaches to Multifrequency Sp Stacking Tested in the Anatolian Region.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Hua J.,et al."New Approaches to Multifrequency Sp Stacking Tested in the Anatolian Region".Journal of Geophysical Research: Solid Earth 125.11(2020).