DOI: 10.1002/2014GL059673
论文题名: Direct measurement of subsurface mass change using the variable baseline gravity gradient method
作者: Kennedy J. ; Ferré T.P.A. ; Güntner A. ; Abe M. ; Creutzfeldt B.
刊名: Geophysical Research Letters
ISSN: 0094-10127
EISSN: 1944-9858
出版年: 2014
卷: 41, 期: 8 起始页码: 2827
结束页码: 2834
语种: 英语
英文关键词: continuous gravity
; hydrogeophysics
; timelapse-gravity
Scopus关键词: Gradient methods
; Gravimeters
; Gravitation
; Wetting
; Conventional approach
; Gradient measurement
; Hydrogeophysics
; Nondestructive methods
; Noninvasive measurements
; Signal of interests
; Superconducting gravimeter
; timelapse-gravity
; Loading
; equipment
; geophysical method
; gravimetry
; gravity field
; infiltration
; mass balance
; sensitivity analysis
; signal-to-noise ratio
; subterranean environment
; wetting front
英文摘要: Time-lapse gravity data provide a direct, nondestructive method to monitor mass changes at scales from centimeter to kilometer. But, the effectively infinite spatial sensitivity of gravity measurements can make it difficult to isolate the signal of interest. The variable baseline gravity gradient method, based on the difference of measurements between two gravimeters, is an alternative to the conventional approach of individually modeling all sources of mass and elevation changes. This approach can improve the signal-to-noise ratio for many applications by removing the contributions of Earth tides, loading, and other signals that have the same effect on both gravimeters. At the same time, this approach can focus the support volume within a relatively small user-defined region of the subsurface. The method is demonstrated using paired superconducting gravimeters to make for the first time a large-scale, noninvasive measurement of infiltration wetting front velocity and change in water content above the wetting front. Key Points Variable baseline gravity gradients are measured between two or more gravimeters Gradient measurements eliminate ocean and atmospheric loading noise Infiltration rate and change in water content is estimated using gradient data ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84898726488&doi=10.1002%2f2014GL059673&partnerID=40&md5=15cd9a2e03c1de367a2e31cdc1cd21e2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7391
Appears in Collections: 气候减缓与适应
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作者单位: U.S. Geological Survey, Tucson, AZ, United States
Recommended Citation:
Kennedy J.,Ferré T.P.A.,Güntner A.,et al. Direct measurement of subsurface mass change using the variable baseline gravity gradient method[J]. Geophysical Research Letters,2014-01-01,41(8).