DOI: 10.1016/j.epsl.2017.12.005
Scopus记录号: 2-s2.0-85037811430
论文题名: Time-dependent postseismic slip following the 1978 Mw 7.3 Tabas-e-Golshan, Iran earthquake revealed by over 20 years of ESA InSAR observations
作者: Zhou Y. ; Thomas M.Y. ; Parsons B. ; Walker R.T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 483 起始页码: 64
结束页码: 75
语种: 英语
英文关键词: 1978 Tabas-e-Golshan earthquake
; InSAR
; rate-and-state friction
; Sentinel-1
; time-dependent postseismic slip
Scopus关键词: Earthquakes
; Friction
; Geodetic satellites
; Geometrical optics
; Geophysics
; Slip forming
; Synthetic aperture radar
; Elastic dislocation
; European Space Agency
; InSAR
; Postseismic deformation
; Postseismic slip
; Radar interferometry
; Rate and state friction
; Sentinel-1
; Faulting
; deformation
; earthquake event
; earthquake magnitude
; earthquake mechanism
; earthquake rupture
; Envisat
; geological mapping
; postseismic process
; radar interferometry
; seismic velocity
; Sentinel
; slip
; synthetic aperture radar
; Iran
; Tabas
; Yazd
英文摘要: We use over 20 yrs (1996–2017) of the European Space Agency's (ESA) radar interferometry (InSAR) observations to investigate the postseismic deformation of the Tabas fold segment following the 1978 Mw 7.3 Tabas-e-Golshan earthquake in eastern Iran. We generated maps of satellite line-of-sight (LOS) velocity using two ERS descending tracks (1996–1999), one Envisat descending track (2003–2010), one Sentinel-1A descending track (2014–2017) and one Sentinel-1A ascending track (2014–2017). The LOS velocity shows afterslip continuing for at least 40 yrs after the earthquake. Elastic dislocation modelling based on the InSAR measurements reveals a decrease in postseismic velocities from 5.0 ± 0.8 mm/yr in 1996–1999 to 3.9 ± 0.6 mm/yr in 2003–2005, 3.0 ± 0.4 mm/yr in 2006–2010, and a present rate of 2.3 ± 0.6 mm/yr in 2014–2017. The rates decay with time, t, as 1/t, consistent with the predictions of a simple block-slider model. We then combine the InSAR rates and our previous estimates of the total earthquake slip derived from optical image matching and DEM differencing to explore the frictional behaviour of the Tabas fold. We obtained a rate-and-state parameter a−b≈0.003, indicating rate-strengthening frictional behaviour of the Tabas fault. We also inferred a minimum coseismic slip of 4.7 m, which might have driven bedding-plane shear at shallow depth, resulting in distributed fold growth and secondary faulting observed in the field. The results imply that both coseismic slip and afterslip have occurred in the same location. One possible mechanism to explain such a phenomenon is that the frictional parameter a−b is small enough to allow dynamic ruptures to propagate into rate-strengthening regions. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110090
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, 510275, China; COMET, Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom
Recommended Citation:
Zhou Y.,Thomas M.Y.,Parsons B.,et al. Time-dependent postseismic slip following the 1978 Mw 7.3 Tabas-e-Golshan, Iran earthquake revealed by over 20 years of ESA InSAR observations[J]. Earth and Planetary Science Letters,2018-01-01,483