DOI: 10.1029/2019JB018034
论文题名: Present-Day Vertical Land Motion of Australia From GPS Observations and Geophysical Models
作者: Riddell A.R. ; King M.A. ; Watson C.S.
刊名: Journal of Geophysical Research: Solid Earth
ISSN: 21699313
出版年: 2020
卷: 125, 期: 2 语种: 英语
英文关键词: glacial isostatic adjustment
; GPS
; multivariate regression
; spatiotemporal filtering
; vertical land motion
; vertical velocities
Scopus关键词: deformation
; geophysical method
; glacioisostasy
; GPS
; ice sheet
; mass transport
; modeling
; regression analysis
; Australia
英文摘要: The secular rate of Australia's vertical surface deformation due to past ice-ocean loading changes is not consistent with present vertical velocities observed by a previously sparse network of Global Positioning System (GPS) sites. Current understanding of the Earth's rheology suggests that the expected vertical motion of the crust should be close to zero given that Australia is located in the far field of past ice sheet loading. Recent GPS measurements suggest that the vertical motion of the Australian continent at permanent sites is between 0 and −2 mm/year. Here we investigate if vertical deformation due to previous ice sheet loading can be recovered in the time series of Australian GPS sites through enlarging the number of sites compared to previous studies from ~20 to more than 100 and through the application of improved data filtering. We apply forward geophysical models of elastic surface displacement induced by atmospheric, hydrologic, nontidal ocean, and ice loading and use independent component analysis as a spatiotemporal filter that includes multivariate regression to consider temporally correlated noise in GPS. Using this approach, the common mode error is identified, and subsequent multivariate regression leads to an average reduction in trend uncertainty of ~35%. The average vertical subsidence of the Australian continent is substantially different to vertical motion predicted by glacial isostatic adjustment and surface mass transport models. © 2020 Geoscience Australia, Commonwealth of Australia Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159911
Appears in Collections: 气候变化与战略
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作者单位: Geography and Spatial Sciences, School of Technology, Environments and Design, University of Tasmania, Hobart, TAS, Australia; Geoscience Australia, Canberra, ACT, Australia
Recommended Citation:
Riddell A.R.,King M.A.,Watson C.S.. Present-Day Vertical Land Motion of Australia From GPS Observations and Geophysical Models[J]. Journal of Geophysical Research: Solid Earth,2020-01-01,125(2)