Incorporating Seismic Zonation into Earthquake Catalog Declustering

Incorporating Seismic Zonation into Earthquake Catalog Declustering | 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 Incorporating Seismic Zonation into Earthquake Catalog Declustering Mohamed T. Soliman, Yasin Fahjan This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6865502/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Seismic hazard assessment relies upon a complete earthquake catalog, necessitating a declustering procedure to filter out dependent aftershocks or foreshocks from the earthquake catalog. Traditional declustering approaches, such as the Gardner-Knopoff approach, utilize magnitude-dependent temporal and spatial windows to distinguish dependent aftershocks/foreshocks from independent mainshocks. However, these approaches may overlook regional seismic characteristics, which leads to missing out primary independent events occurring within the time and space window following a strong earthquake, particularly when the background rate is elevated. This study proposes a modified declustering approach that employs seismic zonation as an additional parameter in the declustering procedure. The proposed methodology investigates adjustments to the magnitude term within the filtering window criteria based on the correlation of the seismic zone of a designated event with other events. A comparative analysis with the classical Gardner-Knopoff approach is conducted to evaluate the effectiveness of the proposed approach. The findings show that using seismic zonation in declustering improves the depiction of the distribution of seismic activity and reduces the likelihood of filtering out primary independent mainshocks. Seismic hazard declustering earthquake catalog seismic zonation Kahramanmaras earthquake Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted 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. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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-6865502","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":475655966,"identity":"4721f31e-abbc-496f-8ad7-39ed254724ee","order_by":0,"name":"Mohamed T. Soliman","email":"","orcid":"","institution":"West Virginia University","correspondingAuthor":false,"prefix":"","firstName":"Mohamed","middleName":"T.","lastName":"Soliman","suffix":""},{"id":475655967,"identity":"43d6eb63-43d6-48aa-9b57-69ac9ee81d07","order_by":1,"name":"Yasin Fahjan","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAyUlEQVRIiWNgGAWjYBAC9gYeBgMGBhseMI+HGC08B8Ba0nh4oFokiNICBIcZSNDCfvZAwc8d52XsJRIYH7xtY6gzbyCkhScvwbD3zG0eHokEZsO5bQwSMgcIaLFnyDEw4G0Da2GT5gVqIegyHv43BoZ/286BtLD/Jk6LRI6BMW/bAbAtzERqeWNgLNuWzMNz5mGz5JxzEpIzCDssx8zwbZudPXt78sEPb8ps+AmHMgMDmwGEZmxgICZaQID5AVHKRsEoGAWjYOQCAMEfMUA8BNHwAAAAAElFTkSuQmCC","orcid":"","institution":"Istanbul Technical University","correspondingAuthor":true,"prefix":"","firstName":"Yasin","middleName":"","lastName":"Fahjan","suffix":""}],"badges":[],"createdAt":"2025-06-10 17:53:20","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-6865502/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-6865502/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":87223767,"identity":"df17f0e5-703e-4fa8-a7f9-e2a4d289abd7","added_by":"auto","created_at":"2025-07-21 16:46:23","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":2527500,"visible":true,"origin":"","legend":"","description":"","filename":"DeclusteringArticleJournalofSeismology5.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6865502/v1_covered_d14d5bdc-662a-4fc6-8de2-e91c4ebcacb9.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Incorporating Seismic Zonation into Earthquake Catalog Declustering","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Seismic hazard, declustering, earthquake catalog, seismic zonation, Kahramanmaras earthquake","lastPublishedDoi":"10.21203/rs.3.rs-6865502/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6865502/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eSeismic hazard assessment relies upon a complete earthquake catalog, necessitating a declustering procedure to filter out dependent aftershocks or foreshocks from the earthquake catalog. Traditional declustering approaches, such as the Gardner-Knopoff approach, utilize magnitude-dependent temporal and spatial windows to distinguish dependent aftershocks/foreshocks from independent mainshocks. However, these approaches may overlook regional seismic characteristics, which leads to missing out primary independent events occurring within the time and space window following a strong earthquake, particularly when the background rate is elevated. This study proposes a modified declustering approach that employs seismic zonation as an additional parameter in the declustering procedure. The proposed methodology investigates adjustments to the magnitude term within the filtering window criteria based on the correlation of the seismic zone of a designated event with other events. A comparative analysis with the classical Gardner-Knopoff approach is conducted to evaluate the effectiveness of the proposed approach. The findings show that using seismic zonation in declustering improves the depiction of the distribution of seismic activity and reduces the likelihood of filtering out primary independent mainshocks.\u003c/p\u003e","manuscriptTitle":"Incorporating Seismic Zonation into Earthquake Catalog Declustering","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-06-26 14:03:52","doi":"10.21203/rs.3.rs-6865502/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"f1e5af2d-df93-4540-9bb4-f00e85cf8854","owner":[],"postedDate":"June 26th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2025-07-21T16:38:13+00:00","versionOfRecord":[],"versionCreatedAt":"2025-06-26 14:03:52","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-6865502","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-6865502","identity":"rs-6865502","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}