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- DI51B-0009: How Anisotropy Biases Seismic Imaging at Volcanic Systems – Insights from Body-Wave Tomography at Mt. Etna
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Board 0009‚ Hall EFG (Poster Hall)NOLA CC
Author(s):Generic 'disconnected' Message
Kira van Helden, University of Padova (First Author, Presenting Author)
Brandon VanderBeek, University of Leeds
Gianmarco Del Piccolo, University of Padova
Manuele Faccenda, University of Padova
Rosalia Lo Bue, Istituto Nazionale di Geofisica e Vulcanologia
Elisabetta Giampiccolo, Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo
Ornella Cocina, Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo
Marco Firetto Carlino, Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo
Seismic tomography is a common method to image the subsurface structure of volcanoes, with travel times of seismic waves providing information about thermal and compositional heterogeneities in the crust and mantle. For simplicity, most tomography studies ignore the potential directional dependence of seismic wave velocity (seismic anisotropy). However, seismic anisotropy is a common phenomenon at volcanic fields, due to the shape preferred orientation of (fluid-filled) cracks. Neglecting this may create substantial imaging artifacts in isotropic seismic tomography studies. Here we present both isotropic and anisotropic tomography results of synthetic body-wave travel time data generated through a known 3D reference model of the Etna volcano (based on prior imaging), with and without anisotropy present in the model. Our results reveal imaging artifacts due to the neglection of seismic anisotropy, and show how taking anisotropy into account is required to uncover true isotropic velocity anomalies. Future work will include (time-dependent) anisotropic S-wave tomography of real data at Mt. Etna and subsequent geodynamic modelling of the volcano’s subsurface structure and stress state.
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