Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet

Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Distinct triggering mechanisms of the 2023 Türkiye earthquake doublet Zhi Wang, Qiang qiu, Yi Fu, Jian lin, Shunping Pei This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4851358/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 14 Apr, 2025 Read the published version in Communications Earth & Environment → Version 1 posted You are reading this latest preprint version Abstract Despite advancements in understanding the rupture processes and surface deformations of the 2023 Türkiye earthquake doublet, their seismogenic mechanisms remain elusive. Here, we determined the three-dimensional 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 an earthquake. Earth and environmental sciences/Solid Earth sciences/Geophysics Earth and environmental sciences/Solid Earth sciences/Seismology 2023 Türkiye earthquake doublet joint seismic tomography fluid intrusion brittle-ductile deformation earthquake asperity Full Text Additional Declarations There is NO Competing Interest. Supplementary Files 20240801SIFinal.pdf Cite Share Download PDF Status: Published Journal Publication published 14 Apr, 2025 Read the published version in Communications Earth & Environment → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4851358","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":339833157,"identity":"0c67fedf-2732-44f2-999f-31b3bd671cdc","order_by":0,"name":"Zhi 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