Seismo-acoustics of Tungurahua volcano, Ecuador

Description: Explosive volcanic eruptions produce seismic and acoustic waves that travel through the ground and air, respectively, interacting at the air-ground boundary. This thesis presents a study of these signals and how they correlate during ?ve sustained eruptions at Tungurahua volcano, Ecuador. It is well known that corrections for site effects can be necessary in the study of seismic sources. What is less well known is that acoustic waves, after coupling at the air-ground interface, are also sensitive to site effects, thereby in?uencing seismic records. In this study a new procedure for site effect corrections that uses seismic noise is developed and it is shown that seismic source locations improve after applying such corrections. From acoustic studies about jets, it is well known that the acoustic intensity recorded at a ?xed location depends on the jet velocity. Here, it is proposed that the seismic intensities of waves produced during sustained eruptions depend on the ?ow velocity of the gas-pyroclast mixture that is ejected through the conduit, which forms the volcanic plume and generates the acoustic waves. Additionally, seismic and an acoustic indices

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