UACE: Interpretation of fin whales diving behaviour in the vicinity of an IMS hydrophone triplet

• Day: June 16, Monday
    Location / Time: A. TERPSIHORI at 15:50-16:10
• Last minutes changes: -
• Session: 04. Comprehensive Nuclear-Test-Ban Treaty Monitoring, and its Civil and Scientific Applications
  Organiser(s): Georgios Haralabus, Mario Zampolli, Tiago Oliveira, Mark Prior
  Chairperson(s): Georgios Haralabus, Tiago Oliveira
• Lecture: Interpretation of fin whales diving behaviour in the vicinity of an IMS hydrophone triplet
  Paper ID: 2166
  Author(s): Ronan Le Bras, Peter Nielsen, Paulina Bittner
  Presenter: Ronan Le Bras
  Abstract: Baleen whale calls are frequently observed at triplets of hydrophones of the International Monitoring System hydroacoustic stations. Fin whale signals emit characteristic time-frequency patterns. Two types of fin whale signals are observed on the southern triplet of IMS stations HA11, located close to Wake Island in the Pacific Ocean. Echoing of the signals is clear on the recorded traces and attributed to multiple bottom and sea surface reflections. Differential move-out between the direct arrivals, sea bottom and surface multiple reflections are modelled and interpreted as indication of the depths reached by the animals within a single dive. The waveforms resulting from the complex interaction between the direct signal and surface and sea bottom reflections signal are modelled. These observations and techniques provide a harmless way to record abundant observations of the animals’ diving behaviour and should help biologists in interpreting the time statistics and variations of the diving behaviour.
• Corresponding author: Dr Ronan Le Bras
  Affiliation: retired
  Country: Austria