DOI: 10.1002/2014GL060905
论文题名: Broadscale postseismic gravity change following the 2011 Tohoku-Oki earthquake and implication for deformation by viscoelastic relaxation and afterslip
作者: Han S.-C. ; Sauber J. ; Pollitz F.
刊名: Geophysical Research Letters
ISSN: 0094-10576
EISSN: 1944-10307
出版年: 2014
卷: 41, 期: 16 起始页码: 5797
结束页码: 5805
语种: 英语
Scopus关键词: 2011 Tohoku-Oki earthquakes
; Gravity changes
; Viscoelastic relaxation
; coseismic process
; deformation
; GRACE
; gravity field
; rupture
; viscoelasticity
英文摘要: The analysis of GRACE gravity data revealed postseismic gravity increase by 6 ìGal over a 500 km scale within a couple of years after the 2011 Tohoku-Oki earthquake, which is nearly 40-50% of the coseismic gravity change. It originates mostly from changes in the isotropic component corresponding to the Mrr moment tensor element. The exponential decay with rapid change in a year and gradual change afterward is a characteristic temporal pattern. Both viscoelastic relaxation and afterslip models produce reasonable agreement with the GRACE free-air gravity observation, while their Bouguer gravity patterns and seafloor vertical deformations are distinctly different. The postseismic gravity variation is best modeled by the biviscous relaxation with a transient and steady state viscosity of 1018 and 1019 Pa s, respectively, for the asthenosphere. Our calculated higher-resolution viscoelastic relaxation model, underlying the partially ruptured elastic lithosphere, yields the localized postseismic subsidence above the hypocenter reported from the GPS-acoustic seafloor surveying. © 2014. American Geophysical Union. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84906017557&doi=10.1002%2f2014GL060905&partnerID=40&md5=842829ed2c7b9780df471eb759357999
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7840
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Han S.-C.,Sauber J.,Pollitz F.. Broadscale postseismic gravity change following the 2011 Tohoku-Oki earthquake and implication for deformation by viscoelastic relaxation and afterslip[J]. Geophysical Research Letters,2014-01-01,41(16).