globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228770
论文题名:
The transition zone between the Eastern Alps and the Pannonian basin imaged by ambient noise tomography
作者: Szanyi G.; Gráczer Z.; Balázs B.; Kovács I.J.; AlpArray Working Group
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 805
语种: 英语
中文关键词: AlpArray ; Ambient noise tomography ; Crustal shear velocity model ; Direct inversion ; Pannonian basin ; Rayleigh-wave
英文关键词: Acoustic noise ; Group velocity dispersion ; Light velocity ; Percolation (fluids) ; Seismology ; Shear waves ; Structural geology ; Tomography ; Wave propagation ; Ambient noise tomographies ; Ambient seismic noise ; Broad-band seismic stations ; Empirical green's functions ; Horizontal resolution ; Rayleigh wave group velocities ; Shear velocity models ; Shear wave velocity models ; Shear flow ; ambient noise ; crustal structure ; data inversion ; Green function ; Rayleigh wave ; seismic anisotropy ; seismic noise ; tomography ; transition zone ; Alps ; Eastern Alps ; Pannonian Basin ; Vienna Basin
英文摘要: The aim of this study was to establish a 3D shear-wave velocity model of the transition zone between the Eastern Alps and the Pannonian basin by means of ambient noise tomography. Datasets from permanent networks as well as past and recently deployed temporary networks of broadband seismic stations have been processed. Empirical Green's functions were estimated via cross-correlation of vertical component ambient seismic noise and further processed to obtain Rayleigh-wave group-velocity dispersion curves. They were directly inverted for shear velocities through a wavelet-based sparsity-constrained tomography method avoiding the intermediate step of constructing 2D group velocity maps. A horizontal resolution of 0.2° in the upper crust and 0.3°–0.5° in the lower crust was achieved. Our upper crustal shear velocity model revealed low velocities in the sedimentary depocenters and high velocities below the surrounding mountains. However, at greater depths (24–29 km), high shear velocities beneath the basins suggest crustal thinning accompanied by mantle updoming. An extremely deep low velocity anomaly was mapped beneath the Vienna basin, which we argue is caused by either sediment transfer to the lower crust; ductile deformation suggested by seismic anisotropy; or the presence of fluids. © 2021 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170909
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作者单位: Kövesligethy Radó Seismological Observatory, ELKH CSFK GGI, Budapest, Hungary; MTA EK Lendület Pannon LitH2Oscope Research Group, Budapest, Hungary; Department of Geophysics and Space Science, ELTE TTK, Budapest, Hungary; Environmental Physics Laboratory, ELKH EK EKBI, Budapest, Hungary

Recommended Citation:
Szanyi G.,Gráczer Z.,Balázs B.,et al. The transition zone between the Eastern Alps and the Pannonian basin imaged by ambient noise tomography[J]. Tectonophysics,2021-01-01,805
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