Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet
Abstract Despite advancements in understanding the rupture processes and surface deformations of the 2023 Türkiye earthquake doublet, their seismogenic mechanisms remain elusive. Here, we employed a joint tomographic method utilizing 215,906 P- and S-wave arrival time pairs to determine the fine-sca...
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| Format: | Article |
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Nature Portfolio
2025-04-01
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| Series: | Communications Earth & Environment |
| Online Access: | https://doi.org/10.1038/s43247-025-02266-5 |
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| author | Zhi Wang Qiang Qiu Yi Fu Jian Lin Shunping Pei |
| author_facet | Zhi Wang Qiang Qiu Yi Fu Jian Lin Shunping Pei |
| author_sort | Zhi Wang |
| collection | DOAJ |
| description | Abstract Despite advancements in understanding the rupture processes and surface deformations of the 2023 Türkiye earthquake doublet, their seismogenic mechanisms remain elusive. Here, we employed a joint tomographic method utilizing 215,906 P- and S-wave arrival time pairs to determine the fine-scale seismic and porosity structures in the rupture zones. We find that the first Mw 7.8 earthquake occurred in a brittle or near-brittle structure zone with low porosity and fluid saturation, offering a potential condition for brittle failure with supershear rupture. By contrast, the second Mw 7.6 quake initiated in a ductile belt characterized by high porosity and fluid saturation, explaining the observed sub-shear rupture behaviors. The former induces large decreasing normal stress, thus opening the Çardak fault, accelerating the migration of saturated fluids towards the fault zone through intra-crustal faults and extended cracks, increasing pore pressure, and delaying triggering a second earthquake. Our findings reveal the diverse seismogenic mechanisms of the Türkiye earthquake doublet, suggesting that fluid intrusion may have played a crucial role in triggering the second Mw 7.6 quake. |
| format | Article |
| id | doaj-art-cdb7459f305b484d9bd5b59f952aa9d2 |
| institution | OA Journals |
| issn | 2662-4435 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Earth & Environment |
| spelling | doaj-art-cdb7459f305b484d9bd5b59f952aa9d22025-08-20T02:27:11ZengNature PortfolioCommunications Earth & Environment2662-44352025-04-016111310.1038/s43247-025-02266-5Distinct triggering mechanisms of the 2023 Türkiye earthquake doubletZhi Wang0Qiang Qiu1Yi Fu2Jian Lin3Shunping Pei4State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of SciencesState Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of SciencesCAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of SciencesCAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of SciencesSchool of Earth Sciences, Yunnan UniversityAbstract Despite advancements in understanding the rupture processes and surface deformations of the 2023 Türkiye earthquake doublet, their seismogenic mechanisms remain elusive. Here, we employed a joint tomographic method utilizing 215,906 P- and S-wave arrival time pairs to determine the fine-scale seismic and porosity structures in the rupture zones. We find that the first Mw 7.8 earthquake occurred in a brittle or near-brittle structure zone with low porosity and fluid saturation, offering a potential condition for brittle failure with supershear rupture. By contrast, the second Mw 7.6 quake initiated in a ductile belt characterized by high porosity and fluid saturation, explaining the observed sub-shear rupture behaviors. The former induces large decreasing normal stress, thus opening the Çardak fault, accelerating the migration of saturated fluids towards the fault zone through intra-crustal faults and extended cracks, increasing pore pressure, and delaying triggering a second earthquake. Our findings reveal the diverse seismogenic mechanisms of the Türkiye earthquake doublet, suggesting that fluid intrusion may have played a crucial role in triggering the second Mw 7.6 quake.https://doi.org/10.1038/s43247-025-02266-5 |
| spellingShingle | Zhi Wang Qiang Qiu Yi Fu Jian Lin Shunping Pei Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet Communications Earth & Environment |
| title | Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet |
| title_full | Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet |
| title_fullStr | Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet |
| title_full_unstemmed | Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet |
| title_short | Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet |
| title_sort | distinct triggering mechanisms of the 2023 turkiye earthquake doublet |
| url | https://doi.org/10.1038/s43247-025-02266-5 |
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