Relationship Between Active Faulting/Fracturing and Magmatism Around Santorini: Seismic Anisotropy From an Active Source Tomography Experiment

Abstract In extending volcanic arcs such as the Aegean, tectonic processes exert a significant control on magmatism. Spanning scales from 1 to 10s of km, vents, edifices, and eruptive centers follow orientation of, are located near, fault zones. Whether this magmatism results individual faults/fractures weakening crust or because regional stresses magma input into is debated. Here we investigate magmatic interactions, specifically focusing role local‐scale (<10 km) in controlling We infer fault/fracture orientations anisotropic active‐source P‐wave travel‐time tomography interactions upper Santorini Volcano, Greece, actively deforming region east. use anisotropy magnitude seismic velocity reduction model relative distribution both consistently oriented randomly faults/fractures. Our show that faulting/fracturing resulting regional‐scale (>10 distributed broadly across at 2–3 km depth, approximately paralleling volcanic/magmatic features. On local‐scale, neither localized areas higher density, nor it accommodating enough extensional strain inhibit host rock. The alignment features shows strong despite lack correlation with local density. These suggest strongly influenced by regional‐scale, not processes. have greater impact than due their effect depth.