Investigation of stress and strain rate variations in the Central Alborz by using earthquake focal mechanisms and GPS velocity vector data

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POURBEYRANVAND SH.; TATAR M.

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Journal: GEOSCIENCES Year:2018 | Volume:27 | Issue:108 Page(s): 57-66

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Title

Investigation of stress and strain rate variations in the Central Alborz by using earthquake focal mechanisms and GPS velocity vector data

Author(s)

POURBEYRANVAND SH. | TATAR M. | Issue Writer Certificate

Keywords

Strain partitioningQ1

Central AlborzQ2

Strain rateQ1

StressQ2

InterpolationQ1

Earthquake focal mechanismQ1

InversionQ1

Abstract

The Alborz, as one of important seismotectonic provinces in Iran, has a great vulnerability from natural disasters, especially seismic risk point of view, because of the existence of Tehran megacity in its southern edge. The importance of this area has caused to the establishment of a relatively dense GPS network around it. In this study, Earthquake focal mechanism data obtained from different resources, was used for Stress tensor Inversion in the Central Alborz. On the other hand, Interpolation of the GPS vectors in rectangular grids and differentiation in the center of each grid cell was used for study of Strain rate in this area. The results showed spatialvariations in principle axes of Stress and in Strain rate in different parts of the Central Alborz, which shows the geodynamic complexity of the study area. Finally, the angular differences between the maximum horizontal Stress and compressive axis directions of Strain rate were calculated in the location of the clusters of the earthquakes. These calculations showed that the extent of the Strain partitioning in the middle parts of the mountain range, where strike-slip motions on Mosha and Firuzkuh faults are observed, has more significant effect on the current deformation processes in the Central Alborz. In contrast, in the northern parts of the range, where dominantly dip-slip motions on Khazar Thrust and North Alborz fault occur, deformation partitioning plays a minor role.

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APA: Copy

POURBEYRANVAND, SH., & TATAR, M.. (2018). Investigation of stress and strain rate variations in the Central Alborz by using earthquake focal mechanisms and GPS velocity vector data. GEOSCIENCES, 27(108 ), 57-66. SID. https://sid.ir/paper/32543/en

Vancouver: Copy

POURBEYRANVAND SH., TATAR M.. Investigation of stress and strain rate variations in the Central Alborz by using earthquake focal mechanisms and GPS velocity vector data. GEOSCIENCES[Internet]. 2018;27(108 ):57-66. Available from: https://sid.ir/paper/32543/en

IEEE: Copy

SH. POURBEYRANVAND, and M. TATAR, “Investigation of stress and strain rate variations in the Central Alborz by using earthquake focal mechanisms and GPS velocity vector data,” GEOSCIENCES, vol. 27, no. 108 , pp. 57–66, 2018, [Online]. Available: https://sid.ir/paper/32543/en

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