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No.83 (2007/3) >

 
Title :Neotectonic stress analysis of the Red Sea rift by Finite Element Modeling
Authors :Dwivedi, Sunil Kumer
Hayashi, Daigoro
Authors alternative :林, 大五郎
Issue Date :Mar-2007
Abstract :The Red Sea is a tectonic rift that was formed in the late oligocene-early Miocene when the originally connected African and Arabian land masses broke apart. At first it was a continental rift, then, as Arabia drifted away, developed into an intercontinental system that today separates the independent Arabian plate from the African plate. The Red Sea rift is part of an extensive global system of faults running approximately north to south. In the present study, numerical modeling on the Saudi Arabian seismic reflection profiles is carried out to examine the neotectonic stress field in the south western Red Sea-Arabian plate margin to reveal a kinetics of active fault system using two-dimensional elastic finite element method (FEM) under plane strain condition. The Mohr-Coulomb failure criterion has been adopted to analyze the relationship between stress distribution and fault formation.A Saudi Arabian reflection profile (Mooney et al, 1985; Prodehl, 1985) is adopted for the modeling and extensional displacement boundary condition is imposed along NE-SW direction. Our result shows the extensional displacement and physical properties of rock layer control the distribution, orientation, magnitude and intensity of the stress and fault development. According to the calculated stress patterns of failure elements, normal faults develop in the Red Sea and Arabian Plate margin. The results from our simulation are in good agreement with those of the seismicity, focal mechanism solution of earthquakes and active faulting in the Red Sea.
Type Local :紀要論文
ISSN :0286-9640
Publisher :琉球大学理学部
URI :http://hdl.handle.net/20.500.12000/448
Citation :琉球大学理学部紀要 = Bulletin of the College of Science. University of the Ryukyus no.83 p.3 -28
Appears in Collections:No.83 (2007/3)

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