Study on coseismic surface deformation of the 2023 Turkey MW7.8 and MW7.5 double strong earthquakes using optical image correlation method

KANG Wenjun; XU Xiwei

doi:10.12090/j.issn.1006-6616.2023144

Volume 30 Issue 2

Apr. 2024

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KANG Wenjun, XU Xiwei, 2024. Study on coseismic surface deformation of the 2023 Turkey MW7.8 and MW7.5 double strong earthquakes using optical image correlation method. Journal of Geomechanics, 30 (2): 289-297. DOI: 10.12090/j.issn.1006-6616.2023144

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KANG Wenjun, XU Xiwei, 2024. Study on coseismic surface deformation of the 2023 Turkey M_W7.8 and M_W7.5 double strong earthquakes using optical image correlation method. Journal of Geomechanics, 30 (2): 289-297. DOI: 10.12090/j.issn.1006-6616.2023144

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Study on coseismic surface deformation of the 2023 Turkey M_W7.8 and M_W7.5 double strong earthquakes using optical image correlation method

doi: 10.12090/j.issn.1006-6616.2023144

KANG Wenjun^{1, 2
,},
XU Xiwei³

1.
National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085, China
2.
Key Laboratory of Compound and Chained Natural Hazards Dynamics, Ministry of Emergency Management of China, Beijing 100085, China
3.
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China

Funds:

the Youth Fund of National Natural Science Foundation of China 42302257

the Fundamental Research Fund for the National Institute of Natural Hazards ZDJ2021-06

the Earthquake Joint Fund of National Natural Science Foundation of China U1839204

More Information

Received: 2023-09-04
Revised: 2024-03-24
Accepted: 2024-03-24

Available Online: 2024-04-11

Published: 2024-04-28

Abstract

Abstract

Objective On February 6, 2023, double strong earthquakes of M_W7.8 and M_W7.5 occurred consecutively within 10 hours in the Kahramanmaraş province in central-southern Turkey. After these double-strong earthquakes, domestic and foreign seismologists studied coseismic surface deformation using field measurements, GNSS, and differential InSAR methods. However, owing to the limitations in the techniques employed, the current coseismic surface deformation results suffer from low spatial resolution and missing data near fault surface ruptures. This study aims to address these limitations and comprehensively present the coseismic surface deformation of the double earthquakes in Turkey. Methods Using Sentinel-2 optical image data, the east-west and north-south surface coseismic deformation fields of Turkey' s double-strong earthquakes were obtained using the image correlation method, and these surface deformations were converted into sinistral strike-slip displacement along the fault direction. Results The deformation field results showed that the surface rupture lengths of the double earthquakes are approximately 280 and 130 km, respectively. The average strike-slip displacement of the first M_W7.8 earthquake is 4.2±1.66 m; the maximum strike-slip displacement is 6.9±0.81 m. The average strike-slip displacement of the subsequent M_W7.5 earthquake is 4.9±2.45 m, and the maximum strike-slip displacement is 9.6±1.16 m. Conclusion Comparison of the horizontal displacement results obtained using the COSI-Corr method and field measurements revealed that the maximum horizontal displacements obtained using the two methods are consistent. In contrast, the average displacement results obtained using the COSI-Corr method are slightly larger than the horizontal displacement results obtained using field measurements, attributed to the inclusion of "off-fault" deformations. Significance This study not only provides deformation data and constraints for the fault-slip inversion model but also deepens the understanding of factors controlling the rupture behavior of strike-slip faults.
- double strong earthquakes in Turkey,
- East Anatolian Fault,
- Sentienl-2,
- optical image correlation,
- coseismic surface deformation,
- Cardak Fault

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