Analysis of the stress field and strain rate in Zagros-Makran transition zone

Rostam, Ghasem Ghorbani; Pakzad, Mehrdad; Mirzaei, Noorbakhsh; Sakhaei, Seyed Reza

doi:10.1007/s10950-017-9705-x

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…There are various studies that have tried to investigate present-day stresses and deformations of the Zagros-Iranian Plateau region using focal-mechanism inversions, GPS data, and numerical modeling. The stresses were computed through the inversion of focal mechanisms in areas like the Zagros fold-and-thrust belt (Nouri et al, 2023;Sarkarinejad et al, 2018;Yaghoubi et al, 2021), the Zagros-Makran transition zone (Ghorbani Rostam et al, 2018), western Zagros (Navabpour et al, 2008), northwestern Iran to southeastern Turkey (Mokhoori et al, 2021), the northeastern Lut block, eastern Iran (Rashidi et al, 2022;Raeesi et al, 2017), and the southern Caspian Sea (Jackson et al, 2002). The GPS studies also provided constraints on the presentday deformation in the Zagros-Makran transition zone (Bayer et al, 2006), Makran subduction zone (Frohling and Szeliga, 2016), Iran (Khorrami et al, 2019;Masson et al, 2006Masson et al, , 2007Vernant et al, 2004;Walpersdorf et al, 2014), and the Nubia-Arabia-Eurasia plate system (Reilinger and McClusky, 2011).…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of stresses and deformation in the Zagros–Iranian Plateau region

Singh,

Yadav

2023

Solid Earth

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Abstract. The Zagros orogenic system resulted due to collision of the Arabian plate with the Eurasian plate. The region is characterized by ocean–continent subduction and continent–continent collision, and the convergence velocity shows variations from east to west. Therefore, this region shows the complex tectonic stress and a wide range of diffuse or localized deformation between both plates. The in situ stress and GPS data are very limited and sparsely distributed in this region; therefore, we performed a numerical simulation of the stresses causing deformation in the Zagros–Iran region. The deviatoric stresses resulting from the variations in lithospheric density and thickness and those from shear tractions at the base of the lithosphere due to mantle convection were computed using thin-sheet approximation. Stresses associated with both sources can explain various surface observations of strain rates, SHmax, and plate velocities, thus suggesting a good coupling between lithosphere and mantle in most parts of Zagros and Iran. As the magnitude of stresses due to shear tractions from density-driven mantle convection is higher than those from lithospheric density and topography variations in the Zagros–Iranian Plateau region, mantle convection appears to be the dominant driver of deformation in this area. However, the deformation in the east of Iran is caused primarily by lithospheric stresses. The plate velocity of the Arabian plate is found to vary along the Zagros belt from the north–northeast in the southeast of Zagros to the northwest in northwestern Zagros, similarly to observed GPS velocity vectors. The output of this study can be used in seismic hazards estimations.

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Section: Introductionmentioning

confidence: 99%

Numerical modeling of stresses and deformation in the Zagros–Iranian Plateau region

Singh,

Yadav

2023

Solid Earth

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“…This reverse and right-lateral, NNW trending fault system, offsets the topographical deformation in the Zagros and the Makran prisms 11 . Many studies have been made on this transition zone, such as stress distribution (see 10,12 and 13 ), source parameters and/or slip distribution (e.g. 14 ), joint gravity and surface wave tomography 15 , and ambient seismic noise tomography (e.g.…”

Section: Introductionmentioning

confidence: 99%

Crustal Structure of the Collision-Subduction Zone in South of Iran Using Virtual Seismometers

Shirzad

Riahi

Assumpção

2019

Sci Rep

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Improving the resolution of seismic tomography by adding virtual seismometers is an ambitious aim in regions with poor instrumental coverage. In this study, inter-event empirical Green’s functions (EGFs) were retrieved using cross-correlation of the vertical component of 630 earthquakes with M ≥ 4 which occurred around the collision-subduction transition zone in south Iran. To extract reliable inter-event EGFs and obtain stable tomographic results, we used about 1300 event pairs with good signal-to-noise ratio, each pair well aligned to a seismic station. Our results show that the retrieved inter-event EGFs agree well with those obtained from earthquakes in similar paths. The inverted velocity model presents two main layers including upper crust (up to ~16 km) and middle crust (deeper than ~18 km) in both sides of the Minab-Zendan-Palami transition zone. The upper crust contains two main layers: sedimentary and basement layers with thicknesses ~6 and ~10 km, respectively. Moreover, the main faults cause lateral variations in these main layers. The difference between the average velocities of the middle crust, between the collision and subduction zones, is about 0.5 km/s, delimited by faults. Also, an area with a 30 km width along these faults can be defined as the collision-subduction transition zone.

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Fault stability analysis and its application in stress inversion quality assessment

Li,

Wan,

Liu

et al. 2023

Environ Earth Sci

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Fault stability analysis plays an important role in assessing the potential hazard of faults and in studying the mechanism of earthquake occurrence. Fault stability depends on the magnitude of the normal and shear stresses imposed on the fault by the tectonic stress and rock friction, while the magnitude of the normal and shear stresses is related to the spatial orientation of the fault normal with respect to the three principal stress axes, so it is easier to understand the variation of fault stability with its orientation by expressing the stability of different faults in the principal axis coordinate system. In this paper, we first developed a method to plot the stability of faults with different orientations in the principal stress axis coordinate system, then investigated the influence of the magnitude of principal stresses and friction on fault instability, and reached the conclusion that the instability is mainly affected by the relative magnitude of principal stresses (shape ratio). Finally, we proposed to use fault stability as an indicator to evaluate the quality of inverted stress obtained from fault slip data or earthquake focal mechanisms, that is, to evaluate the reliability of the inverted stress according to the compatibility of stress and fault stability. It is described in detail in terms of measured fault slip data from two regions.

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Analysis of the stress field and strain rate in Zagros-Makran transition zone

Cited by 5 publications

References 27 publications

Numerical modeling of stresses and deformation in the Zagros–Iranian Plateau region

Numerical modeling of stresses and deformation in the Zagros–Iranian Plateau region

Crustal Structure of the Collision-Subduction Zone in South of Iran Using Virtual Seismometers

Fault stability analysis and its application in stress inversion quality assessment

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