Aftershock characteristics of the 2024 Noto Peninsula earthquake (Mw7.5) through centroid moment tensor analysis using a 3-D seismic velocity structure model

Aftershock characteristics of the 2024 Noto Peninsula earthquake (Mw7.5) through centroid moment tensor analysis using a 3-D seismic velocity structure model | 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 Research Article Aftershock characteristics of the 2024 Noto Peninsula earthquake (Mw7.5) through centroid moment tensor analysis using a 3-D seismic velocity structure model Lina Yamaya, Hisahiko Kubo, Katsuhiko Shiomi, Takeshi Kimura This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5618048/v2 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 16 May, 2025 Read the published version in Earth, Planets and Space → Version 2 posted 4 You are reading this latest preprint version Show more versions Abstract A crustal earthquake of the 2024 Noto Peninsula earthquake with a moment magnitude of 7.5 occurred on January 1, 2024, and was followed by many aftershocks distributed in both onshore and offshore regions. The mainshock was characterized as a reverse fault with NW-SE pressure- (P-) axes. We conducted centroid moment tensor (CMT) inversions for the aftershocks using a three-dimensional seismic velocity structure model to capture the detailed stress state and fault geometries around the source region. CMT solutions were obtained for 221 aftershocks with moment magnitudes of 3.2–6.1 at depths shallower than 15 km. Our approach showed substantial improvement in depth determination of CMT solutions, compared to that of the hypocenter determination using P- and S-wave arrival times, even for the early aftershock period when no seismic station was available close to the earthquake source region. Our CMT solutions were characterized as follows: (1) reverse faults with an NW-SE P-axis, which is consistent with that of the mainshock mechanism; (2) strike-slip faults in predominantly shallower regions compared to type 1; (3) reverse faults with ENE-WSW P-axes, possibly activated following the mainshock in the shallow southwestern aftershock region; and (4) earthquakes predominantly featuring normal and strike-slip faults localizing at a depth of approximately 5 km around the dip transition zone in geologically constructed fault models. Additionally, we conducted the same CMT inversion for earthquakes that occurred between 2007 and 2023 to further understand the effect of the mainshock on the aftershock dynamics. We confirmed that CMT solutions of types 3 and 4 appeared as new earthquake categories after the mainshock, suggesting that the mainshock could have triggered them. Our results provide a deeper understanding of complex stress fields and fault geometries in the source region. Centroid moment tensor inversion 2024 Noto Peninsula earthquake aftershocks Full Text Cite Share Download PDF Status: Published Journal Publication published 16 May, 2025 Read the published version in Earth, Planets and Space → Version 2 posted Reviewers agreed at journal 17 Mar, 2025 Reviewers invited by journal 17 Mar, 2025 Editor assigned by journal 13 Mar, 2025 First submitted to journal 09 Mar, 2025 You are reading this latest preprint version Show more versions 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-5618048","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":429981926,"identity":"86085552-92ba-4bc1-a953-f1d69d6a09e3","order_by":0,"name":"Lina Yamaya","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAvUlEQVRIiWNgGAWjYBACPmYg8bEBSDCD+WyEtbABVTLOJE0LSDFvAykOY2PnPfjZdoeNPX87A/OLDwx8eUQ4jC9ZOvdMWuKMwwxsljMY2IqJ0MJjIJ3bdjiBAajFmIeBLZGgI4FajH9bth22lydFi5k0Y9thxg2HGZgfE63Fshfol42HGdsYZxgQ4Rd+/jPGN34CQ0zu/OHDHz5UHCMcYkiAsU2CweBYAilaGJg/MDDUkKZlFIyCUTAKRgQAAIxUMPK2wScjAAAAAElFTkSuQmCC","orcid":"https://orcid.org/0000-0001-9628-2871","institution":"National Research Institute for Earth Science and Disaster Resilience: Bosai Kagaku Gijutsu Kenkyujo","correspondingAuthor":true,"prefix":"","firstName":"Lina","middleName":"","lastName":"Yamaya","suffix":""},{"id":429981927,"identity":"d04f1747-ae5c-4e5a-a8ca-29dbf47f6093","order_by":1,"name":"Hisahiko Kubo","email":"","orcid":"","institution":"National Research Institute for Earth Science and Disaster Prevention: Bosai Kagaku Gijutsu Kenkyujo","correspondingAuthor":false,"prefix":"","firstName":"Hisahiko","middleName":"","lastName":"Kubo","suffix":""},{"id":429981928,"identity":"470a7863-e003-4853-8ec8-a1d6ab58241c","order_by":2,"name":"Katsuhiko Shiomi","email":"","orcid":"","institution":"National Research Institute for Earth Science and Disaster Resilience: Bosai Kagaku Gijutsu Kenkyujo","correspondingAuthor":false,"prefix":"","firstName":"Katsuhiko","middleName":"","lastName":"Shiomi","suffix":""},{"id":429981929,"identity":"81162883-4ef7-4059-b53c-5bc5c9b5a845","order_by":3,"name":"Takeshi Kimura","email":"","orcid":"","institution":"National Research Institute for Earth Science and Disaster Prevention: Bosai Kagaku Gijutsu Kenkyujo","correspondingAuthor":false,"prefix":"","firstName":"Takeshi","middleName":"","lastName":"Kimura","suffix":""}],"badges":[],"createdAt":"2024-12-10 15:28:07","currentVersionCode":2,"declarations":"","doi":"10.21203/rs.3.rs-5618048/v2","doiUrl":"https://doi.org/10.21203/rs.3.rs-5618048/v2","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1186/s40623-025-02196-8","type":"published","date":"2025-05-16T15:57:55+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":83067960,"identity":"4f926cd5-6c36-48fb-8f36-9228ab2a3500","added_by":"auto","created_at":"2025-05-19 16:08:40","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":676963,"visible":true,"origin":"","legend":"","description":"","filename":"yamaya.pdf","url":"https://assets-eu.researchsquare.com/files/rs-5618048/v2_covered_f16d55bc-2d84-4611-841f-4448af8157bc.pdf"}],"financialInterests":"","formattedTitle":"Aftershock characteristics of the 2024 Noto Peninsula earthquake (Mw7.5) through centroid moment tensor analysis using a 3-D seismic velocity structure model","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":true,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"earth-planets-and-space","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"epsp","sideBox":"Learn more about [Earth, Planets and Space](http://earth-planets-space.springeropen.com)","snPcode":"","submissionUrl":"https://www.editorialmanager.com/epsp/default.aspx","title":"Earth, Planets and Space","twitterHandle":"@SpringerOpen","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"BMC/SO AJ","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"Centroid moment tensor inversion, 2024 Noto Peninsula earthquake, aftershocks","lastPublishedDoi":"10.21203/rs.3.rs-5618048/v2","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-5618048/v2","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eA crustal earthquake of the 2024 Noto Peninsula earthquake with a moment magnitude of 7.5 occurred on January 1, 2024, and was followed by many aftershocks distributed in both onshore and offshore regions. 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