气候变化领域集成服务门户(CCPortal): Inversion of Longer-Period OBS Waveforms for P Structures in the Oceanic Lithosphere and Asthenosphere

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DOI	10.1029/2019JB018810
	Inversion of Longer-Period OBS Waveforms for P Structures in the Oceanic Lithosphere and Asthenosphere
	Takeuchi N.; Kawakatsu H.; Shiobara H.; Isse T.; Sugioka H.; Ito A.; Utada H.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	We performed waveform inversion of the P waveforms recorded by our BroadBand Ocean Bottom Seismometers (BBOBSs) deployed in the Northwestern Pacific. Consequently, the depth profile of the P velocity of the oceanic upper mantle, which has not been well resolved by previous surface wave or receiver function analyses, was revealed. We considered the azimuthal anisotropy in the lithosphere, which significantly improved the variance reduction from 34% to 44%. The resulting P model exhibited higher and lower velocities in the lithosphere and asthenosphere, respectively. The velocity contrast was found to be second/third of that observed in the previous S models; however the obtained model appeared to have some trade-off with the VS structures in the vicinity of the source. We compared our P model with the previous S model obtained using our BBOBSs and obtained the VP/VS model. The resulting VP/VS model has two notable features. First, the lithosphere is characterized by a rapid increase in the VP/VS values with depth, which implies chemical stratification. Second, the VP/VS values in the vicinity of the lithosphere-asthenosphere boundary (LAB) are larger than the synthetic values of any major upper mantle mineral predicted by considering the anharmonic effects, which suggests the effects of anelasticity or melt. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	anisotropy; asthenosphere; lithosphere; plate tectonics; seismology; tomography
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/187742
作者单位	Earthquake Research Institute, University of Tokyo, Tokyo, Japan; Graduate School of Science, Kobe University, Kobe, Japan; Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
推荐引用方式 GB/T 7714	Takeuchi N.,Kawakatsu H.,Shiobara H.,et al. Inversion of Longer-Period OBS Waveforms for P Structures in the Oceanic Lithosphere and Asthenosphere[J],2020,125(7).
APA	Takeuchi N..,Kawakatsu H..,Shiobara H..,Isse T..,Sugioka H..,...&Utada H..(2020).Inversion of Longer-Period OBS Waveforms for P Structures in the Oceanic Lithosphere and Asthenosphere.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Takeuchi N.,et al."Inversion of Longer-Period OBS Waveforms for P Structures in the Oceanic Lithosphere and Asthenosphere".Journal of Geophysical Research: Solid Earth 125.7(2020).