DOI: 10.1002/2016GL069664
论文题名: Detectability of temporal changes in fine structures near the inner core boundary beneath the eastern hemisphere
作者: Yu W.
刊名: Geophysical Research Letters
ISSN: 0094-8912
EISSN: 1944-8643
出版年: 2016
卷: 43, 期: 13 起始页码: 6924
结束页码: 6931
语种: 英语
英文关键词: coda wave interferometry
; inner core boundary
; PKP waves
; repeating earthquakes
Scopus关键词: Earthquakes
; Geophysics
; Coda wave interferometry
; Decadal timescale
; Double differential
; Fine-scale structures
; Inner core boundary
; Melting and solidification
; Repeating earthquake
; Temporal dependence
; Melting
; coda
; detection method
; dynamic analysis
; inner core
; melting
; observational method
; seismic survey
; solidification
; subduction
; subduction zone
; timescale
; topography
; uncertainty analysis
; Pacific Ocean
; Pacific Ocean (Southwest)
英文摘要: The inner core boundary (ICB), where melting and solidification of the core occur, plays a crucial role in the dynamics of the Earth's interior. To probe temporal changes near the ICB beneath the eastern hemisphere, I analyze differential times of PKiKP (dt(PKiKP)), double differential times of PKiKP-PKPdf, and PKiKP coda waves from repeating earthquakes in the southwest Pacific subduction zones. dt(PKiKP) values are mostly within ±30 ms of one another, without systematic temporal dependence. Some observations of PKiKP coda waves have absolute time shifts of >50 ms relative to their main phases. The combination of temporal changes in PKiKP coda arrivals and negligible changes in PKiKP arrivals favors a smooth ICB with fine-scale structures in the upper inner core. dt(PKiKP) values are interpreted in the context of melting- or growth-induced ICB topography, based on dynamic models. Uncertainties in dt(PKiKP) prevent verification of ICB melting or growth on decadal time scales. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978288299&doi=10.1002%2f2016GL069664&partnerID=40&md5=35a54ab770118401912a228b02a2b928
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9875
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
Recommended Citation:
Yu W.. Detectability of temporal changes in fine structures near the inner core boundary beneath the eastern hemisphere[J]. Geophysical Research Letters,2016-01-01,43(13).