DOI: 10.1002/grl.50241
论文题名: Signature of fault zone deformation in near-surface soil visible in shear wave seismic reflections
作者: Ghose R. ; Carvalho J. ; Loureiro A.
刊名: Geophysical Research Letters
ISSN: 0094-9203
EISSN: 1944-8934
出版年: 2013
卷: 40, 期: 6 起始页码: 1074
结束页码: 1078
语种: 英语
英文关键词: fault zone deformation
; near surface
; seismic modeling
; soil
Scopus关键词: Deformation pattern
; Ductile deformations
; Fault zone
; Near surfaces
; Seismic exploration
; Seismic modeling
; Shear wave reflection
; Unconsolidated sediment
; Deformation
; Sedimentology
; Sediments
; Seismic prospecting
; Seismic waves
; Seismology
; Shear waves
; Soils
; Faulting
; data set
; deformation mechanism
; fault zone
; faulting
; Holocene
; S-wave
; seismic reflection
; stacking
; Lisboa [Portugal]
; Portugal
; Vila Franca de Xira
英文摘要: Small-throw seismogenic fault segments hidden in the Holocene sediments are crucial but difficult targets in seismic exploration. We report here the detection of the deformation pattern and a concealed fault segment in the unconsolidated sediments at Vila Franca Xira, Portugal, through identification in shear wave reflection data of multiple signatures of ductile deformation associated with faulting. We find step-like changes in the stacking velocity along a shallow subsoil layer boundary, indicating synsedimentary faulting. We also recognize a consistent distortion in the moveout of the reflection events in the raw shear wave data. Synthetic modeling of seismic data helps in interpreting these observations and identifying backscattered energy from a steeply dipping shallow fault zone. Prior to this finding, there was no evidence for Holocene activity of this fault, although the fault is considered to be the most probable source for the disastrous 1531 earthquake. Key Points Signatures of deformation and faulting in soil are found in S reflections First evidence of Holocene activity of the Vila Franca Xira fault is detected Multiple signatures found in reflection data are supported by modeling. ©2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876904977&doi=10.1002%2fgrl.50241&partnerID=40&md5=36674380abdad2ac8c6cbe626ed1c1ea
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6467
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geoscience and Engineering, Delft University of Technology, PO Box 5028, 2628 GA Delft, Netherlands
Recommended Citation:
Ghose R.,Carvalho J.,Loureiro A.. Signature of fault zone deformation in near-surface soil visible in shear wave seismic reflections[J]. Geophysical Research Letters,2013-01-01,40(6).