DOI: 10.1016/j.epsl.2018.05.011
Scopus记录号: 2-s2.0-85047215082
论文题名: Evidence for crustal low shear-wave speed in western Saudi Arabia from multi-scale fundamental-mode Rayleigh-wave group-velocity tomography
作者: Tang Z. ; Mai P.M. ; Chang S.-J. ; Zahran H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 495 起始页码: 24
结束页码: 37
语种: 英语
英文关键词: Arabian Shield
; Cenozoic volcanism
; group-velocity tomography
; Rayleigh-wave
; shear-velocity inversion
Scopus关键词: Acoustic wave velocity
; Geodynamics
; Light velocity
; Rayleigh waves
; Seismology
; Shear waves
; Structural geology
; Tomography
; Wave propagation
; Cenozoic volcanism
; Group velocities
; Lithospheric thickness
; Rayleigh wave group velocities
; Regional earthquakes
; Shear velocities
; Shear velocity models
; Shear wave velocity models
; Shear flow
英文摘要: We investigate the crustal and upper-mantle shear-velocity structure of Saudi Arabia by fundamental-mode Rayleigh-wave group-velocity tomography and shear-wave velocity inversion. The seismic dataset is compiled using ∼140 stations of the Saudi National Seismic Network (SNSN) operated by the Saudi Geological Survey (SGS). We measure Rayleigh-wave group-velocities at periods of 8–40 s from regional earthquakes. After obtaining 1-D shear-wave velocity models by inverting group-velocities at each grid node, we construct a 3-D shear-velocity model for Saudi Arabia and adjacent regions by interpolating the 1-D models. Our 3-D model indicates significant lateral variations in crustal and lithospheric thickness, as well as in the shear-wave velocity over the study region. In particular, we identify zones of reduced shear-wave speed at crustal levels beneath the Cenozoic volcanic fields in the Arabian Shield. The inferred reductions of 2–5% in shear-wave speed may be interpreted as possibly indicating the presence of partial melts. However, their precise origin we can only speculate about. Our study also reveals an upper-mantle low velocity zone (LVZ) below the Arabian Shield, supporting the model of lateral mantle flow from the Afar plume. Further geophysical experiments are needed to confirm (or refute) the hypothesis that partial melts may exist below the Cenozoic volcanism in western Saudi Arabia, and to build a comprehensive geodynamic–geological model for the evolution and present state of the lithosphere of the Arabian Plate and the Red Sea. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109813
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: King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia; Kangwon National University (KNU), Chuncheon, South Korea; Saudi Geological Survey (SGS), Jeddah, Saudi Arabia
Recommended Citation:
Tang Z.,Mai P.M.,Chang S.-J.,et al. Evidence for crustal low shear-wave speed in western Saudi Arabia from multi-scale fundamental-mode Rayleigh-wave group-velocity tomography[J]. Earth and Planetary Science Letters,2018-01-01,495