DOI: 10.1016/j.tecto.2020.228372
论文题名: High-resolution 3-D crustal shear-wave velocity model reveals structural and seismicity segmentation of the central-southern Tanlu Fault zone, eastern China
作者: Bem T.S. ; Yao H. ; Luo S. ; Yang Y. ; Wang X. ; Wang X. ; Li L. ; Liu B.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 778 语种: 英语
中文关键词: Ambient noise tomography
; Central-southern Tanlu Fault
; Crust
; Seismicity
; Shear-wave velocity
英文关键词: Acoustic noise
; Acoustic wave velocity
; Dispersion (waves)
; Earthquakes
; Faulting
; Geodynamics
; Metamorphic rocks
; Phase velocity
; Shear waves
; Spatial distribution
; Surface waves
; Tomography
; Ambient noise tomographies
; Crust
; Seismicity
; Shear wave velocity
; Tanlu fault
; Shear flow
; ambient noise
; crustal structure
; Green function
; image processing
; S-wave
; seismic tomography
; seismicity
; three-dimensional modeling
; velocity structure
; vertical distribution
; China
; North China Block
英文摘要: The Early-Mesozoic collision between the North and South China Cratons resulted in different tectonic and geologic structures including the Tanlu Fault zone. One way to understand the geodynamic processes beneath these structures is by studying the velocity structures and spatial distribution of earthquakes in the region. We performed ambient noise tomography for the region around the central-southern Tanlu Fault zone using the vertical component of continuous ambient noise data obtained in central East China. Empirical Green's functions were retrieved from ambient noise cross-correlation functions, from which we extracted the Rayleigh wave phase velocity dispersion curves and performed quality control on the dispersion data. The direct surface wave tomography method was used to invert all phase velocity dispersion data for the 3-D shear-wave velocity model in the crust and uppermost mantle. Our results show velocity segmentations with high-velocity structures existing beneath orogenic belts and uplifts within the first 10 km depths which correspond to the High-Pressure/Ultra-High Pressure Metamorphic rocks in the area. The existence of high-velocity structures beneath orogenic belts at shallow depths implies that the exhumation of eclogites is confined to the uppermost crust. Generally, fault zones in this area are characterized by a low velocity from 0 to 5 km and relatively high velocity in the lower part of the upper crust and the middle crust. The spatial distribution of earthquakes along Tanlu Fault reveals two seismicity zones: the southern segment and the Suqian-Tancheng segment with a low-velocity transitional zone at Suqian, which suggests that the two segments respond differently to stresses. Regions of dense earthquake distribution correspond to the transition zones of high to low shear-wave velocities, which could be as a result of instability in the upper mantle and variation in compositions of crustal materials. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170547
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; Department of Physics, Federal University Duste, Dutse, Jigawa State, Nigeria; Mengcheng National Geophysical Observatory, University of Science and Technology of ChinaAnhui, China; CAS Center for Excellence in Comparative Planetology, USTC, Hefei, Anhui 230026, China; Anhui Earthquake Agency, Hefei, Anhui, China
Recommended Citation:
Bem T.S.,Yao H.,Luo S.,et al. High-resolution 3-D crustal shear-wave velocity model reveals structural and seismicity segmentation of the central-southern Tanlu Fault zone, eastern China[J]. Tectonophysics,2020-01-01,778