Abstract
We examine the interplay between the Cobb hotspot and the Juan de Fuca ridge by mapping the base of the crust at their intersection near Axial Volcano. PmP traveltimes from an extensive active source seismic experiment are used in conjunction with prior crustal tomography to map crustal thickness. A cross‐section along the ridge axis consists of two distinct trends. In addition to 1–2 km of excess crust, inferred from gravity along a 100 km section of the central ridge, we find a narrow 20–40 km diameter root extending to 11 km directly beneath the volcano. Focused magma flux from the Cobb hotspot (0.3–0.8 m3/s) is inferred to be the cause of both the narrow root, and the large magma reservoir, at Axial. The rapid return to thinner crust, away from the intersection, marks a transition back to ridge‐dominated magmatism.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
