DOI: 10.1002/2015GL063819
论文题名: Coseismic compression/dilatation and viscoelastic uplift/subsidence following the 2012 Indian Ocean earthquakes quantified from satellite gravity observations
作者: Han S.-C. ; Sauber J. ; Pollitz F.
刊名: Geophysical Research Letters
ISSN: 0094-9543
EISSN: 1944-9274
出版年: 2015
卷: 42, 期: 10 起始页码: 3764
结束页码: 3772
语种: 英语
英文关键词: elastic deformation
; GPS
; gravity change
; strike-slip earthquake
; viscoelastic relaxation
Scopus关键词: Climate models
; Elastic deformation
; Geodetic satellites
; Global positioning system
; Viscoelasticity
; Earthquake sequences
; Gravity changes
; Gravity recovery and climate experiment datum
; Noise characteristic
; Satellite gravity
; Spatial localization
; Strike-slip earthquakes
; Viscoelastic relaxation
; Earthquakes
; compression
; coseismic process
; deformation mechanism
; GPS
; GRACE
; gravity field
; Indian Ocean earthquake 2012
; moment tensor
; oceanic crust
; postseismic process
; satellite data
; seismic noise
; strike-slip fault
; subsidence
; uplift
; upper mantle
; viscoelasticity
; Indian Ocean
英文摘要: The 2012 Indian Ocean earthquake sequence (Mw 8.6, 8.2) is a rare example of great strike-slip earthquakes in an intraoceanic setting. With over a decade of Gravity Recovery and Climate Experiment (GRACE) data, we were able to measure and model the unanticipated large coseismic and postseismic gravity changes of these events. Using the approach of normal mode decomposition and spatial localization, we computed the gravity changes corresponding to five moment tensor components. Our analysis revealed that the gravity changes are produced predominantly by coseismic compression and dilatation within the oceanic crust and upper mantle and by postseismic vertical motion. Our results suggest that the postseismic positive gravity and the postseismic uplift measured with GPS within the coseismic compressional quadrant are best fit by ongoing uplift associated with viscoelastic mantle relaxation. Our study demonstrates that the GRACE data are suitable for analyzing strike-slip earthquakes as small as Mw 8.2 with the noise characteristics of this region. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931560545&doi=10.1002%2f2015GL063819&partnerID=40&md5=39b0ea637c8d36979941ebaca9c83652
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9158
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Engineering, University of Newcastle, Callaghan, NSW, Australia
Recommended Citation:
Han S.-C.,Sauber J.,Pollitz F.. Coseismic compression/dilatation and viscoelastic uplift/subsidence following the 2012 Indian Ocean earthquakes quantified from satellite gravity observations[J]. Geophysical Research Letters,2015-01-01,42(10).