气候变化领域集成服务门户(CCPortal): Three-dimensional Elastic and Anelastic Structure of the Lowermost Mantle Beneath the Western Pacific From Finite-Frequency Tomography

CCPortal

DOI	10.1029/2019JB018089
	Three-dimensional Elastic and Anelastic Structure of the Lowermost Mantle Beneath the Western Pacific From Finite-Frequency Tomography
	Konishi K.; Fuji N.; Deschamps F.
发表日期	2020
ISSN	21699313
卷号	125 期号:2
英文摘要	We build a finite-frequency tomography method that uses traveltime and amplitude data for obtaining 3-D maps of shear velocity ((Formula presented.)) and seismic attenuation (measured with the quality factor (Formula presented.)). We then apply this method to recover the 3-D (Formula presented.) and (Formula presented.) structures in the lowermost mantle beneath the western edge of the Pacific large low shear velocity province, using the (Formula presented.) and (Formula presented.) phases for 31 earthquakes that occurred underneath the vicinity of Tonga and Fiji regions. Our data set consists of the transverse components of 1,341 traces from the Japanese F-net seismic station network. The waveform data are applied with a band-pass filter in the period range of 12.5–200 s, corresponding to the frequency range of 0.005–0.08 Hz. Both (Formula presented.) and (Formula presented.) are lower than those in the Preliminary reference Earth model (PREM) in the bottom depth range, with the lowest part being situated at the center of the region we sample. This feature is robust across a variety of inversion configurations. We then estimate possible temperature anomalies in this region from the obtained (Formula presented.) and (Formula presented.) structures. Discrepancy between the temperature anomalies predicted by these two quantities suggests that explaining simultaneously (Formula presented.) and (Formula presented.) anomalies in this region requires both temperature and chemical anomalies. Assuming that (Formula presented.) anomalies are a reliable proxy for temperature and that compositional anomalies primarily consist of an excess in iron oxide, we propose a possible thermal and compositional structure for this region. ©2020. American Geophysical Union. All Rights Reserved.
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/187999
作者单位	Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France
推荐引用方式 GB/T 7714	Konishi K.,Fuji N.,Deschamps F.. Three-dimensional Elastic and Anelastic Structure of the Lowermost Mantle Beneath the Western Pacific From Finite-Frequency Tomography[J],2020,125(2).
APA	Konishi K.,Fuji N.,&Deschamps F..(2020).Three-dimensional Elastic and Anelastic Structure of the Lowermost Mantle Beneath the Western Pacific From Finite-Frequency Tomography.Journal of Geophysical Research: Solid Earth,125(2).
MLA	Konishi K.,et al."Three-dimensional Elastic and Anelastic Structure of the Lowermost Mantle Beneath the Western Pacific From Finite-Frequency Tomography".Journal of Geophysical Research: Solid Earth 125.2(2020).