DOI: 10.1002/2014GL062401
论文题名: Crustal thickness variations and isostatic disequilibrium across the North Anatolian Fault, western Turkey
作者: Frederiksen A.W. ; Thompson D.A. ; Rost S. ; Cornwell D.G. ; Gülen L. ; Houseman G.A. ; Kahraman M. ; Poyraz S.A. ; Teoman U.M. ; Türkelli N. ; Utkucu M.
刊名: Geophysical Research Letters
ISSN: 0094-9001
EISSN: 1944-8732
出版年: 2015
卷: 42, 期: 3 起始页码: 751
结束页码: 757
语种: 英语
英文关键词: crustal thickness
; Moho
; North Anatolian Fault
; Turkey
; vp/vs
Scopus关键词: Loading
; Sedimentology
; Velocity
; Crustal thickness
; Moho
; North Anatolian Fault
; Turkey
; Vp/vs
; Structural geology
; crustal thickness
; deconvolution
; isostasy
; Moho
; sedimentary basin
; seismograph
; stress field
; teleseismic wave
; Anatolia
; Turkey
英文摘要: We use teleseismic recordings from a dense array of seismometers straddling both strands of the North Anatolian Fault Zone to determine crustal thickness, P/S velocity ratio and sedimentary layer thickness. To do this, we implement a new grid search inversion scheme based on the use of transfer functions, removing the need for deconvolution for source normalization and therefore eliminating common problems associated with crustal-scale receiver function analysis. We achieve a good fit to the data except at several stations located in Quaternary sedimentary basins, where our two-layer crustal model is likely to be inaccurate. We find two zones of thick sedimentary material: one north of the northern fault branch, and one straddling the southern branch. The crustal thickness increases sharply north of the northern strand of the North Anatolian Fault Zone (NAFZ), where the fault nearly coincides with the trace of the Intra-Pontide Suture; the velocity ratio changes across the southern fault strand, indicating a change in basement composition. We interpret these changes to indicate that both strands of the NAFZ follow preexisting geological boundaries rather than being ideally aligned with the stress field. The thick crust north of the northern NAFZ strand is associated with low topography and so is inconsistent with simple models of isostatic equilibrium, requiring a contribution from mantle density variations, such as possible loading from underthrust Black Sea oceanic lithosphere. © 2015 The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925036076&doi=10.1002%2f2014GL062401&partnerID=40&md5=08583d782c6a7a31c306cafffcad22e6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8617
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geological Sciences, University of Manitoba, Winnipeg, MN, Canada
Recommended Citation:
Frederiksen A.W.,Thompson D.A.,Rost S.,et al. Crustal thickness variations and isostatic disequilibrium across the North Anatolian Fault, western Turkey[J]. Geophysical Research Letters,2015-01-01,42(3).