Conveners
O1.3 The Oceans and their Properties
- Silvia Blanc (Argentinian Navy Research Office (ARA) & UNIDEF (CONICET))
- Tiago Oliveira (CTBTO Preparatory Commission)
Shallow-water environments, such as the Argentinian continental shelf, present challenges for monitoring underwater acoustic events due to high transmission losses (TL) at low frequencies. While the International Monitoring System (IMS) hydroacoustic network is highly proficient in detecting global low-frequency signals, its coverage in coastal zones is relatively limited due to...
Indonesia is prone to tsunamis caused by seismic (e.g. submarine earthquakes) and non-seismic events (e.g. volcanic activity). Five massive tsunamigenic earthquakes with very different rupture lengths occurred in different parts of the Sunda–Java Trench from 2004 to 2010. This work investigates T-phases recorded at IMS hydrophone stations HA1 and HA8 triggered by these five earthquakes using...
Sound energy density between 50 and 100 Hz in the northeast Pacific Ocean increased roughly in proportion with global shipping tonnage in the second half of the 20th century, consistent with expectation for ambient sound dominated by contributions from distant shipping. Increases were larger in the frequency range 10-40 Hz than can be explained by increased tonnage alone, with largest...
Monitoring and modeling of ship sound are crucial due to its large contribution to underwater ambient sound. The NAVISON (Navis Sonus) project, sponsored by the European Maritime Safety Agency (EMSA), addresses this issue by calculating hindcast (2016–2023) and forecast (2030, 2040, 2050) shipping sound maps for all European seas. These maps focus on two decidecade frequency bands (63 Hz and...
