2025_programme: Accounting for sound speed profile and source-receiver geometry in the inference of ocean bottom seismometers (OBS) location by triangulation
- Day: June 17, Tuesday
Location / Time: B. ERATO at 14:50-15:10
- Last minutes changes: -
- Session: 24. Underwater Seismoacoustics
Organiser(s): Nathalie Favretto-Cristini, Paul Cristini
Chairperson(s): Nathalie Favretto-Cristini, Paul Cristini
- Lecture: Accounting for sound speed profile and source-receiver geometry in the inference of ocean bottom seismometers (OBS) location by triangulation
Paper ID: 2220
Author(s): Loretta Bardavid, Nathalie Favretto-Cristini, Paul Cristini, Myriam Lajaunie, Elodie Marches, Xavier Demoulin, Vadim Monteiller, Bazile G. Kinda, Jean-Michel Boutonnier, Maxence Ferrari
Presenter: Loretta Bardavid
Abstract: Taking into account ultra-low frequency (ULF) waves in marine environment is becoming more and more usual in underwater acoustics to increase signal range and study biophony and anthropogenic noise. ULF waves can be recorded by ocean bottom seismometers (OBS), but these devices are often dropped without any means of controlling their fall through the water to the bottom, so they can drift. However, the position of these sensors can play an important role in the interpretation of the recorded signals. We present here a methodology to determine the OBS location on the seabed more accurately, as well as their tilt. This methodology is based on a triangulation method combined with a ray tracing code (Bellhop). We present the results obtained and discuss the impact of the sound speed profile in water, as well as the impact of the distance between the source and the receiver, on these results. Preliminary results concerning the interpretation of real OBS data acquired in a shallow water environment will also be presented. Research financially supported by the French Ministry of Defence - Defense Innovation Agency and Aix-Marseille University.
- Corresponding author: Ms Loretta Bardavid
Affiliation: Aix Marseille Univ, CNRS, Centrale Med, LMA UMR 7031, Marseille, France
Country: France
