TY - JOUR

T1 - Structural Controls on Fault Slip Models of the 6 February 2023 Kahramanmaraş, Türkiye Earthquake Doublet With Finite Element Analyses

AU - Tung, Sui

AU - Sippl, Christian

AU - Shirzaei, Manoochehr

AU - Taymaz, Tuncay

AU - Masterlark, Timothy

AU - Medved, Irina

N1 - We would like to express our sincere gratitude to the editor, Germ\u00E1n Prieto, the associate editor, and an anonymous reviewer for their insightful comments and suggestions for making this article a better one. The work of Sui Tung was supported by NSF award #2326785, NSF sub-award #S001463, and SCEC award #24192. NSF award #2136809 provided support for Timothy Masterlark. The authors would like to particularly thank the Center for the Observation and Modeling of Earthquakes, Volcanoes and Tectonics (COMET) for sharing the results of earthquake displacement inverted from Sentinel-1/2 data. We would also like to extend our gratitude to the Ministry of Interior Disaster and Emergency Management of T\u00FCrkiye (AFAD) for providing the seismic data set. We also appreciate Anthony Lomax for sharing his relocated seismic catalog, the USGS for providing the surface-trace information, and the European Space Agency (ESA) for sharing the Synthetic Aperture Radar data. Christian Sippl received funding from the European Research Council (ERC) through the Horizon 2020 program (ERC Starting Grant MILESTONE; StG2020-947856). Tuncay Taymaz acknowledges the Istanbul Technical University Research Fund (ITU-BAP) and the Alexander von Humboldt Foundation Research Fellowship Award for providing computing facilities through the Humboldt-Stiftung Follow-Up Program to support his earthquake research studies. We would like to express our sincere gratitude to the editor, Germ\u00E1n Prieto, the associate editor, and an anonymous reviewer for their insightful comments and suggestions for making this article a better one. The work of Sui Tung was supported by NSF award #2326785, NSF sub\u2010award #S001463, and SCEC award #24192. NSF award #2136809 provided support for Timothy Masterlark. The authors would like to particularly thank the Center for the Observation and Modeling of Earthquakes, Volcanoes and Tectonics (COMET) for sharing the results of earthquake displacement inverted from Sentinel\u20101/2 data. We would also like to extend our gratitude to the Ministry of Interior Disaster and Emergency Management of T\u00FCrkiye (AFAD) for providing the seismic data set. We also appreciate Anthony Lomax for sharing his relocated seismic catalog, the USGS for providing the surface\u2010trace information, and the European Space Agency (ESA) for sharing the Synthetic Aperture Radar data. Christian Sippl received funding from the European Research Council (ERC) through the Horizon 2020 program (ERC Starting Grant MILESTONE; StG2020\u2010947856). Tuncay Taymaz acknowledges the Istanbul Technical University Research Fund (ITU\u2010BAP) and the Alexander von Humboldt Foundation Research Fellowship Award for providing computing facilities through the Humboldt\u2010Stiftung Follow\u2010Up Program to support his earthquake research studies.

PY - 2024/8/28

Y1 - 2024/8/28

N2 - Two major earthquakes of Mw7.8 and Mw7.5 ruptured the Southern East Anatolian Fault (SEAF) and the Savrun-Çardak-Sürgü fault (SCSF), devastating southeast Türkiye and northwest Syria on 6 February 2023. We adopt innovative nonlinear and linear approaches to analyze the coseismic ground displacements and estimate the complex slip geometry. Unlike conventional analytical solutions that simplify crust heterogeneity, finite-element fault models invert the displacement data and simulate the dual-fault geometry with non-uniformly distributed shallow crustal materials. Our results suggest the west-dipping SEAF and north-dipping SCSF accommodate earthquake slips of >10 m. Their respective slip distributions and proximal aftershocks correlate spatially with local seismic velocity anomalies (i.e., ΔVp and ΔVs), which implies differences in structural control along these two faults and provides insights into assessing the seismic hazard of mixed incipient-mature fault systems.

AB - Two major earthquakes of Mw7.8 and Mw7.5 ruptured the Southern East Anatolian Fault (SEAF) and the Savrun-Çardak-Sürgü fault (SCSF), devastating southeast Türkiye and northwest Syria on 6 February 2023. We adopt innovative nonlinear and linear approaches to analyze the coseismic ground displacements and estimate the complex slip geometry. Unlike conventional analytical solutions that simplify crust heterogeneity, finite-element fault models invert the displacement data and simulate the dual-fault geometry with non-uniformly distributed shallow crustal materials. Our results suggest the west-dipping SEAF and north-dipping SCSF accommodate earthquake slips of >10 m. Their respective slip distributions and proximal aftershocks correlate spatially with local seismic velocity anomalies (i.e., ΔVp and ΔVs), which implies differences in structural control along these two faults and provides insights into assessing the seismic hazard of mixed incipient-mature fault systems.

KW - Kahramanmaraş earthquake

KW - Türkiye

KW - finite element

KW - geodesy

KW - inversion

KW - structural controls

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85201283939&origin=inward&txGid=a244cfe4c326400887d0d14b53b56e84

UR - https://www.mendeley.com/catalogue/c9004ea9-e66b-367a-a2d7-1985b09db104/

U2 - 10.1029/2023GL107472

DO - 10.1029/2023GL107472

M3 - Article

VL - 51

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 16

M1 - e2023GL107472

ER -