Teleseismic Radial Anisotropy Reveals a Sill-Dominated Magma Reservoir Beneath the Valles Caldera, New Mexico

Teleseismic Radial Anisotropy Reveals a Sill-Dominated Magma Reservoir Beneath the Valles Caldera, New Mexico | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 4 February 2026 V1 Latest version Share on Teleseismic Radial Anisotropy Reveals a Sill-Dominated Magma Reservoir Beneath the Valles Caldera, New Mexico Authors : Gaoshan Guo 0000-0001-7589-0923 [email protected] , Haiqiang Lan 0000-0001-9638-1095 , Tao Xu 0000-0003-0433-2611 , and Qinya Liu 0000-0002-1071-2314 Authors Info & Affiliations https://doi.org/10.22541/au.177023433.37987156/v1 Published Geophysical Research Letters Version of record Peer review timeline 137 views 90 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract The Valles Caldera, one of the largest Quaternary silicic calderas in North America, formed by explosive rhyolitic eruptions. Seismic studies suggest a crustal magmatic reservoir beneath the caldera with low-velocity anomalies, but resolving the detailed geometry of localized melt requires constraints from seismic anisotropy. To image P-wave velocity and radial anisotropy using dense nodal array data, we develop a teleseismic tomography method that integrates an eikonal solver with the adjoint-state approach. Our results reveal a pronounced low-velocity anomaly (>20% reduction) extending laterally across the resurgent dome and down to 15–20~km depth, consistent with a crustal magma chamber. We also identify a colocated zone showing a previously unrecognized pattern of strong positive radial anisotropy (up to 8%) where horizontally polarized P-waves travel faster than vertically polarized ones. This anisotropy indicates a laterally extensive magmatic sill complex and provides new constraints on magma distribution and reservoir architecture beneath the Valles Caldera. Supplementary Material File (1051630_0_merged_1763043210.pdf) Download 5.45 MB File (tele_tomo_ani_crustal_node_vc.pdf) Download 5.45 MB File (tele_tomo_ani_crustal_node_vc_si.pdf) Download 7.75 MB Information & Authors Information Version history V1 Version 1 04 February 2026 Peer review timeline Published Geophysical Research Letters Version of Record 23 Mar 2026 Published Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords geology geophysics Authors Affiliations Gaoshan Guo 0000-0001-7589-0923 [email protected] University of Toronto View all articles by this author Haiqiang Lan 0000-0001-9638-1095 Institute of Geology and Geophysics, Chinese Academy of Sciences View all articles by this author Tao Xu 0000-0003-0433-2611 Institute of Geology and Geophysics Chinese Academy of Sciences View all articles by this author Qinya Liu 0000-0002-1071-2314 University of Toronto View all articles by this author Metrics & Citations Metrics Article Usage 137 views 90 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Gaoshan Guo, Haiqiang Lan, Tao Xu, et al. Teleseismic Radial Anisotropy Reveals a Sill-Dominated Magma Reservoir Beneath the Valles Caldera, New Mexico. Authorea . 04 February 2026. DOI: https://doi.org/10.22541/au.177023433.37987156/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. 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