DOI: 10.1002/2014GL060559
论文题名: Long- and short-term postseismic gravity changes of megathrust earthquakes from satellite gravimetry
作者: Tanaka Y. ; Heki K.
刊名: Geophysical Research Letters
ISSN: 0094-9883
EISSN: 1944-9614
出版年: 2014
卷: 41, 期: 15 起始页码: 5451
结束页码: 5456
语种: 英语
英文关键词: afterslip
; GRACE
; postseismic gravity changes
; seismic cycle
; subduction zone
; viscoelastic relaxation
Scopus关键词: Earthquakes
; Gravimeters
; Viscoelasticity
; Satellites
; afterslip
; GRACE
; Gravity changes
; seismic cycle
; Subduction zones
; Viscoelastic relaxation
; 2011 Tohoku-Oki earthquakes
; Forearc
; Megathrust earthquakes
; Satellite gravimetries
; Time constants
; Time-variable gravity
; Two-component
; Geodetic satellites
; Gravimeters
; coseismic process
; earthquake event
; gravimetry
; gravity field
; satellite imagery
英文摘要: Using monthly satellite gravimetry data, we studied time-variable gravity field after three M9 class earthquakes, the 2004 Sumatra-Andaman, 2010 Chile (Maule), and 2011 Tohoku-oki earthquakes. The observations showed that the gravity typically (1) decreases coseismically, (2) continues to decrease for a few months, and (3) increases over a longer period. Therefore, postseismic gravity changes have two components with different time constants and polarities. The mechanisms of short- and long-term postseismic gravity changes are not as clear as coseismic changes at the moment, but might be explained to some extent with afterslip and the Maxwell viscoelasticity, respectively. These two components are difficult to discriminate with surface velocity measurements because the forearc area moves trenchward at both stages. They appear in different polarities in gravity, making satellite gravimetry a unique tool to separate them. Key Points Postseismic gravity behaviors of the three M9 earthquakes are very similar Postseismic gravity changes are composed of long- and short-term components Afterslip and viscoelastic relaxation can be separated by GRACE © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905314145&doi=10.1002%2f2014GL060559&partnerID=40&md5=c9bd50784218e4d3e8c4786ecf7b1067
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7147
Appears in Collections: 气候减缓与适应
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作者单位: Department of Natural History Sciences, Hokkaido University, Sapporo, Kita-ku, Japan
Recommended Citation:
Tanaka Y.,Heki K.. Long- and short-term postseismic gravity changes of megathrust earthquakes from satellite gravimetry[J]. Geophysical Research Letters,2014-01-01,41(15).