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Jia Z, Jin Z, Marchandon M, Ulrich T, Gabriel AA, Fan W, Shearer P, Zou X, Rekoske J, Bulut F, Garagon A, Fialko Y. The complex dynamics of the 2023 Kahramanmaraş, Turkey, Mw 7.8-7.7 earthquake doublet. Science 2023; 381:985-990. [PMID: 37535759 DOI: 10.1126/science.adi0685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Accepted: 07/19/2023] [Indexed: 08/05/2023]
Abstract
The destructive 2023 moment magnitude (Mw) 7.8-7.7 earthquake doublet ruptured multiple segments of the East Anatolian Fault system in Turkey. We integrated multiscale seismic and space-geodetic observations with multifault kinematic inversions and dynamic rupture modeling to unravel the events' complex rupture history and stress-mediated fault interactions. Our analysis reveals three subshear slip episodes during the initial Mw 7.8 earthquake with a delayed rupture initiation to the southwest. The Mw 7.7 event occurred 9 hours later with a larger slip and supershear rupture on its western branch. Mechanically consistent dynamic models accounting for fault interactions can explain the unexpected rupture paths and require a heterogeneous background stress. Our results highlight the importance of combining near- and far-field observations with data-driven and physics-based models for seismic hazard assessment.
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Affiliation(s)
- Zhe Jia
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
| | - Zeyu Jin
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
| | - Mathilde Marchandon
- Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
| | - Thomas Ulrich
- Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
| | - Alice-Agnes Gabriel
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
- Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
| | - Wenyuan Fan
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
| | - Peter Shearer
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
| | - Xiaoyu Zou
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
| | - John Rekoske
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
| | - Fatih Bulut
- Geodesy Department, Bogazici University Kandilli Observatory and Earthquake Research Institute, Istanbul 34342, Turkey
| | - Aslı Garagon
- Geodesy Department, Bogazici University Kandilli Observatory and Earthquake Research Institute, Istanbul 34342, Turkey
| | - Yuri Fialko
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
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Lyakhovsky V, Ben-Zion Y, Agnon A. Earthquake cycle, fault zones, and seismicity patterns in a rheologically layered lithosphere. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jb900218] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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