TY - JOUR T1 - Magma accumulation beneath Santorini volcano, Greece, from P-wave tomography JF - Geology Y1 - 2020 A1 - McVey, B.G. A1 - Hooft, E.E.E. A1 - Heath, B.A. A1 - Toomey, D.R. A1 - Paulatto, M. A1 - Morgan, J.V. A1 - Nomikou, P. A1 - Papazachos, C.B. AB - Despite multidisciplinary evidence for crustal magma accumulation below Santorini volcano, Greece, the structure and melt content of the shallow magmatic system remain poorly constrained. We use three-dimensional (3-D) velocity models from tomographic inversions of active-source seismic P-wave travel times to identify a pronounced low-velocity anomaly (–21%) from 2.8 km to 5 km depth localized below the northern caldera basin. This anomaly is consistent with depth estimates of pre-eruptive storage and a recent inflation episode, supporting the interpretation of a shallow magma body that causes seismic attenuation and ray bending. A suite of synthetic tests shows that the geometry is well recovered while a range of melt contents (4%–13% to fully molten) are allowable. A thin mush region (2%–7% to 3%–10% melt) extends from the main magma body toward the northeast, observed as low velocities confined by tectono-magmatic lineaments. This anomaly terminates northwest of Kolumbo; little to no melt underlies the seamount from 3 to 5 km depth. These structural constraints suggest that crustal extension and edifice loads control the geometry of magma accumulation and emphasize that the shallow crust remains conducive to melt storage shortly after a caldera-forming eruption. VL - 48 UR - https://pubs.geoscienceworld.org/gsa/geology/article/48/3/231/579527/Magma-accumulation-beneath-Santorini-volcano ER - TY - JOUR T1 - Seismic imaging of Santorini: Subsurface constraints on caldera collapse and present-day magma recharge JF - Earth and Planetary Science Letters Y1 - 2019 A1 - Hooft, E.E.E. A1 - Heath, B.A. A1 - Toomey, D.R. A1 - Paulatto, M. A1 - Papazachos, C.B. A1 - Nomikou, P. A1 - Morgan, J.V. A1 - Warner, M.R. VL - 514 UR - https://linkinghub.elsevier.com/retrieve/pii/S0012821X19301360 ER -