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Surface deformations of the 6 February 2023 earthquake sequence, eastern Türkiye
Jiannan Meng1,2, Timothy Kusky1,2,3, Walter D Mooney4
1State Key Laboratory of Geological Processes and Mineral Resources, Center for Global Tectonics, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China.
Science (New York, N.Y.)
|January 18, 2024
Summary
Two major earthquakes in Türkiye on February 6, 2023, demonstrated complex rupture dynamics. The study documents surface deformation and slip transfer between the Dead Sea and East Anatolian fault zones.
Area of Science:
- Seismology
- Tectonics
- Geophysics
Background:
- Two powerful earthquakes, a moment magnitude (Mw) 7.8 and a Mw 7.5, struck Türkiye on February 6, 2023.
- The seismic events initiated on the Dead Sea fault zone and transferred rupture to the East Anatolian fault zone (EAFZ).
- A significant Mw 4.5 aftershock preceded the second large earthquake, suggesting a causal link.
Purpose of the Study:
- To provide quantitative documentation of surface offsets and kinematics from the slipped faults.
- To analyze surface deformation during large continental strike-slip earthquakes.
- To investigate rupture propagation mechanisms and slip transfer between complex fault systems.
Main Methods:
- Collection of quantitative ground and aerial documentation of surface offsets.
- Analysis of fault kinematics and surface deformation.
- Seismic data analysis to understand rupture propagation and transfer.
Main Results:
- Detailed documentation of surface offsets and fault kinematics was obtained.
- Maximum displacements and energy release occurred on the East Anatolian fault zone (EAFZ).
- Evidence suggests a causal relationship between the aftershock and the second large earthquake.
Conclusions:
- The study provides crucial data on surface deformation in large continental strike-slip earthquakes.
- Slip transfer mechanisms between complex fault systems were elucidated.
- Insights into how linked fault systems accommodate global plate motions were gained.
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