DOI: 10.1016/j.tecto.2021.228931
论文题名: Stress field and tectonic regime of Central Iran from inversion of the earthquake focal mechanisms
作者: Sheikholeslami M.R. ; Mobayen P. ; Javadi H.R. ; Ghassemi M.R.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 813 语种: 英语
中文关键词: Central Iran
; Earthquake
; Focal mechanism
; Stress field
; Stress inversion
英文关键词: Strike-slip faults
; Tensors
; Centroid moment tensors
; Earthquake focal mechanisms
; Geodetic measurements
; Harvard University
; Homogeneous deformation
; Left-lateral movements
; Reduced stress tensors
; Strain partitioning
; Compressive stress
; earthquake
; focal mechanism
; strain partitioning
; stress field
; strike-slip fault
; tectonics
; thrust fault
; Iran
英文摘要: This paper provides a latest compilation of data on the present-day stress pattern in Central Iran and its tectonic regime. We compiled 103 focal mechanism data collected from the Global Centroid Moment Tensor Project (GCMT) including data from Harvard University (HRVD) and the International Seismological Center (ISC). Stress inversion of all shallow focal depths provides a first order stress field with a N029°E maximum horizontal compressive stress (SHmax) direction corresponding to a general compressive tectonic regime. In order to reconstruct the second and third order stress fields, we subdivided the study area into eight zones on the basis of their structures, relatively similar focal mechanisms and relatively homogeneous deformation. For each zone and for the same data set, reduced stress tensors have been obtained by formal stress inversion using the Win-Tensor program and modified SLICK method. Both inversion methods show similar results for horizontal stress axes orientations and for the tectonic regimes. The obtained NE-SW direction of the first order stress field is related to Arabia-Eurasia convergence as confirmed by the geodetic measurements. This stress field is responsible for accommodation of shortening within Central Iran and right-lateral movement along the N-S faults as well as left-lateral movement along the E-W faults. Solid block rotation between strike-slip and thrust faults, vertical rotation of the fault bounded blocks, escape tectonics, block extrusion and strain partitioning occurred due to second and third order stress fields with variable SHmax directions from N006° to N081° and in different tectonic regimes. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170901
Appears in Collections: 气候变化与战略
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作者单位: Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran; International Institute of Earthquake Engineering and Seismology, Tehran, Iran; Geological Survey of Iran, Azadi Square, Meraj Avenue, Tehran, 13185-1494, Iran
Recommended Citation:
Sheikholeslami M.R.,Mobayen P.,Javadi H.R.,et al. Stress field and tectonic regime of Central Iran from inversion of the earthquake focal mechanisms[J]. Tectonophysics,2021-01-01,813