气候变化领域集成服务门户(CCPortal): Deep structure of the western coast of the Makran subduction zone, SE Iran

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DOI	10.1016/j.tecto.2019.228314
	Deep structure of the western coast of the Makran subduction zone, SE Iran
	Motaghi K.; Shabanian E.; Nozad-Khalil T.
发表日期	2020
ISSN	00401951
卷号	776
英文摘要	The Makran subduction zone is one of the world's least well documented active subduction zones. We investigate the geometry of subsurface velocity interfaces across the western coastal Makran by means of teleseismic data for the first time. The data were gathered by two permanent and four temporary seismic stations. We calculated P receiver functions and jointly inverted them with surface wave dispersion data to generate a 2-D shear wave velocity model. Employing this model, we migrated receiver functions to depth and show two gently northward dipping interfaces at depths of 9–15 km as the base of the accretionary wedge and 27–31 km as the Moho boundary. 360-degree periodic amplitude variation of the Ps pulse at 0.4 s and 1.4 s are modeled as an anisotropic layer between 2 and 9 km near the Makran shoreline. We interpret this layer as a signature for the accretionary prism of the subduction zone beneath the coastal Makran. One interesting observation is that all multiples of the Moho pulse have a twin. By H-κ stacking of receiver functions, we showed that the twin multiples of the Moho boundary could be a signature of a thin (~ 4.5–7 km) high velocity oceanic crust located at a depth range of 24.5 km to 31.5 km. Our new model for western Makran shows that the coastal Makran is still on the oceanic lithosphere and the filled trench is located almost 200 km north of the active accretion front. This different geometry for the subduction has implications for the location and rupture parameters of future potential megathrust events which, in the western Makran, could have significant influences on seismic hazard, tsunami propagation and thermal structure modeling of the subduction zone. © 2019 Elsevier B.V.
关键词	Accretionary prism Geometry of subduction zone Makran Receiver function
英文关键词	Geometry; Prisms; Seismology; Shear waves; Surface waves; Wave propagation; Accretionary prism; Amplitude variations; Makran; Oceanic lithosphere; Receiver functions; Shear wave velocity models; Subduction zones; Surface wave dispersion; Shear flow; accretionary prism; amplitude; Moho; oceanic crust; P-wave; seismic velocity; subduction zone; teleseismic wave; wave velocity; Arabian Sea; Indian Ocean; Makran Subduction Zone
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207832
作者单位	Institute for Advanced Studies in Basic Sciences, Zanjan, 45195-1159, Iran
推荐引用方式 GB/T 7714	Motaghi K.,Shabanian E.,Nozad-Khalil T.. Deep structure of the western coast of the Makran subduction zone, SE Iran[J],2020,776.
APA	Motaghi K.,Shabanian E.,&Nozad-Khalil T..(2020).Deep structure of the western coast of the Makran subduction zone, SE Iran.Tectonophysics,776.
MLA	Motaghi K.,et al."Deep structure of the western coast of the Makran subduction zone, SE Iran".Tectonophysics 776(2020).