Multi-sensor acoustic evidence of submarine volcanism across diverse tecto-volcanic regimes ...

• Main Author: Spain, EA
• Format: Thesis
• Language: unknown
• Published: University Of Tasmania 2023
• Subjects: Heard Island
• Online Access: https://dx.doi.org/10.25959/23247113.v1; https://figshare.utas.edu.au/articles/thesis/Multi-sensor_acoustic_evidence_of_submarine_volcanism_across_diverse_tecto-volcanic_regimes/23247113/1

Submarine volcanism and associated submarine venting can be observed using multibeam bathymetry, seafloor backscatter, water-column backscatter, and sub-bottom acoustic profiling. While numerous volcanically-driven gas accumulation and venting phenomena can be observed through these techniques (such as water-column acoustic flares, subsurface acoustic blanking, and seafloor acoustic hardgrounds), detecting active submarine volcanism remains largely enigmatic due to the rarity of observations at appropriate spatial or temporal scales and underutilisation of coincident data. This thesis uncovers and characterises active volcanic processes in three distinct submarine volcanic terrains by capitalising on rich tapestries of acoustic and ancillary data to develop multi-frequency, multi-sensor, and multi-scale acoustic analyses. The first contribution is a multi-frequency water-column backscatter investigation into mechanisms for sediment-hosted seeps and volcanic vents offshore the volcanically active Heard Island ...