{"paper_id":"0c07ebf6-672e-4f93-8cf5-e1a65685e0cd","body_text":"Tracking Transcrustal Magma Ascent Beneath Laguna del Maule, Chile | 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 Tracking Transcrustal Magma Ascent Beneath Laguna del Maule, Chile Jim Bradford, Sankha Subhra Mahanti, Eric Kiser, Susan Beck, Martin Fernandez, and 7 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8060109/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract There is abundant evidence that arc volcanoes are fed by complex networks of storage zones that extend throughout the crust. Though the geometric details of these transcrustal magmatic systems are well resolved beneath several volcanic settings, the relationship between magma transport at depth and volcanic unrest at the surface remains poorly constrained. At Laguna del Maule in central Chile, the site of several Holocene silicic eruptions and present-day surface uplift, we show that seismically imaged magma reservoirs in the upper and lower crust are connected by a zone of deep crustal seismicity. A pronounced one-day swarm of this seismicity in 2018 was followed 3 months later by an increase in the inflation rate observed at the surface. We infer that this earthquake swarm was driven by the injection of a new batch of melt, transported between lower to upper crust magma reservoirs. The lag time between melt transport and surface inflation was governed by the hydraulic diffusivity of the upper crustal reservoir. These results indicate that volcanic unrest at Laguna del Maule begins deep within the crust and months before observable signals of shallow magma reservoir pressurization and may be replicable for volcanic arcs worldwide. Earth and environmental sciences/Natural hazards Earth and environmental sciences/Solid Earth sciences/Seismology Earth and environmental sciences/Solid Earth sciences/Volcanology Full Text Additional Declarations There is NO Competing Interest. Supplementary Files LagunaDeLMauleSupplementaryMaterial.pdf Tracking Transcrustal Magma Ascent Beneath Laguna del Maule, Chile Cite Share Download PDF Status: Under Review 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. 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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-8060109\",\"acceptedTermsAndConditions\":true,\"allowDirectSubmit\":false,\"archivedVersions\":[],\"articleType\":\"Article\",\"associatedPublications\":[],\"authors\":[{\"id\":543520362,\"identity\":\"c5b06489-b4b6-4e5c-b80e-59472d5cff98\",\"order_by\":0,\"name\":\"Jim 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