DOI: 10.1016/j.epsl.2018.03.033
Scopus记录号: 2-s2.0-85044453180
论文题名: ‘Two go together’: Near-simultaneous moment release of two asperities during the 2016 Mw 6.6 Muji, China earthquake
作者: Bie L. ; Hicks S. ; Garth T. ; Gonzalez P. ; Rietbrock A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 491 起始页码: 34
结束页码: 42
语种: 英语
英文关键词: InSAR
; Muji earthquake
; multiple moment tensor inversion
; near simultaneous failure
; seismic gap
Scopus关键词: Faulting
; Shear flow
; Shear waves
; Synthetic aperture radar
; Tensors
; Wave propagation
; Centroid moment tensors
; Geodetic observation
; InSAR
; Interferometric synthetic aperture radars
; Moment tensor inversion
; Rupture propagation
; Seismic gaps
; Short time intervals
; Earthquakes
英文摘要: On 25 November 2016, a Mw 6.6 earthquake ruptured the Muji fault in western Xinjiang, China. We investigate the earthquake rupture independently using geodetic observations from Interferometric Synthetic Aperture Radar (InSAR) and regional seismic recordings. To constrain the fault geometry and slip distribution, we test different combinations of fault dip and slip direction to reproduce InSAR observations. Both InSAR observations and optimal distributed slip model suggest buried rupture of two asperities separated by a gap of greater than 5 km. Additional seismic gaps exist at the end of both asperities that failed in the 2016 earthquake. To reveal the dynamic history of asperity failure, we inverted regional seismic waveforms for multiple centroid moment tensors and construct a moment rate function. The results show a small centroid time gap of 2.6 s between the two sub-events. Considering the >5 km gap between the two asperities and short time interval, we propose that the two asperities failed near-simultaneously, rather than in a cascading rupture propagation style. The second sub-event locates ∼39 km to the east of the epicenter and the centroid time is at 10.7 s. It leads to an estimate of average velocity of 3.7 km/s as an upper bound, consistent with upper crust shear wave velocity in this region. We interpret that the rupture front is propagating at sub-shear wave velocities, but that the second sub-event has a reduced or asymmetric rupture time, leading to the apparent near-simultaneous moment release of the two asperities. © 2018 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109920
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: School of Environmental Sciences, University of Liverpool, United Kingdom; Department of Ocean and Earth Sciences, University of Southampton, United Kingdom; Department of Earth Sciences, University of Oxford, United Kingdom; Geophysical Institute, Karlsruhe Institute of Technology, Germany
Recommended Citation:
Bie L.,Hicks S.,Garth T.,et al. ‘Two go together’: Near-simultaneous moment release of two asperities during the 2016 Mw 6.6 Muji, China earthquake[J]. Earth and Planetary Science Letters,2018-01-01,491