InSAR study of current tectonic deformation and seismic hazard analysis of the Kongur tension system in northeastern Pamir's

doi:10.13474/j.cnki.11-2246.2024.0814

Abstract

Abstract: The Pamir Syntaxis is characterized by frequent strong earthquakes and has been a key area of interest in continental dynamics research. The Kongur tension system located within the Pamir is one of the most important tensional faults within the central and eastern Pamir. Studying its current tectonic deformation is of great significance for exploring the current deformation state,dynamic mechanism, strong earthquake activity and disaster prevention in the Pamir. This paper processed Sentinel-1 SAR data from two orbits during the period from 2018 to 2022, obtained a high-density 3D deformation rate field in the study area, and discussed the seismic hazard in the study area in combination with Coulomb stress. The results show that in the east-west direction, the Muji Fault had a dextral strike-slip of 10 and the Kungai Shan South Fault and the Kongur Shan Fault had a tensile rate of 11 mm/a and 5 mm/a, respectively. The Mushtag Fault almost did not undergo tensile movement; vertically, the south wall of the Muji fault rose by 7 mm/a and the north wall rose by 3 mm/a. Both sides of the Kungai Shan South Fault, the Kongur Shan Fault, and the Mushtag Fault had a certain degree of uplift, about 3 mm/a; static Coulomb stress indicated that the northern section of the Kongur tension system is a dangerous area for future strong earthquakes.

Key words: Kongur tension system, InSAR, tectonic deformation, Coulomb stress, earthquake hazard

CLC Number:

P237

CHEN Rongliu, LI Jie, LIU Daiqin. InSAR study of current tectonic deformation and seismic hazard analysis of the Kongur tension system in northeastern Pamir's[J]. Bulletin of Surveying and Mapping, 2024, 0(8): 79-83,89.

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