Description
E-poster session with display of each e-poster on an assigned touchscreen
On 17 June 2013, the container ship MOL Comfort suffered a crack amidships during inclement weather in the Arabian Sea. The ship broke into two sections that sank on 27 June and 10 July 2013, respectively. A triplet of hydrophone station HA08 of the International Monitoring System recorded underwater sound phases associated with the sinking of the two sections. Arrivals derived from...
The computation of 3D acoustic models for long-range propagation in realistic oceanic environments poses significant computational challenges. Here, we present an extension of our GPU-accelerated hydroacoustic transmission loss solver in Julia. This work is built upon a model previously developed by us, enhancing its capability to run in cloud environments with large-memory GPU instances. It...
Research on tsunami potential in northern Bali is rarely conducted. Most of the prior research was conducted in the southern region of Bali island due to its geographical location near the megathrust subduction zone. However, the earthquake-triggered tsunami may occur due to the existence of a Back Arc Thrust (BAT) zone in the north of Bali. A Back Arc Thrust (BAT) zone runs across the...
Depth assessment is one of the most difficult, however, most effective event screening methods and is usually achieved by the International Monitoring System using seismic sensors. Analysis of waveforms recorded at hydrophones from a small set of events with similar mechanisms and relatively high SNR, located in Central Sumatra, indicated promising depth sensitivity and dependency of T-phase...
The low attenuation in seawater and the low-velocity layer SOFAR (Sound Fixing and Ranging) channel enable the hydroacoustic stations of the International Monitoring System (IMS) to record acoustic waves over long distances. The French National Data Center uses the Progressive Multi-Channel Correlation (PMCC) method to detect low-frequency coherent waves (< 40 Hz). These detected underwater...
A low frequency sound source, deployed in the mid-1990s off the North Coast of Kauai at deep sound channel axis, provides a critical tool for measuring the deep ocean temperature across North Pacific Basin. This temperature measurement is enabled by precisely timed transmissions from a cabled sound source and their reception on distant cabled hydrophones. We focus on hydrophone receptions at...
Rapid changes to the Arctic Ocean impact its acoustic environment. As the Arctic warms, the soundscape is modified by changes to the thermohaline stratification of the water column as well as changes in the distribution and morphology of sea ice. Sea ice attenuates sound through scattering and absorption, emits sounds as it deforms and exerts control over the generation of sea surface waves...
Whale signals are frequently observed at triplets of hydrophones of the IMS hydroacoustic stations. Fin whale signals emit characteristic time-frequency patterns. Two types of fin whale signals are observed at 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...
Indonesia is at the forefront of earthquake and tsunami disasters due to tectonic and geological complexity. Non-seismic tsunamis caused by landslides and volcanic collapses have become an important new disaster issue in Indonesia since the 2018 Palu and 2018 Sunda Strait events. Based on VSI-ESDM (2024), a dozen active volcanoes were found on the coast and under the sea. Mount Gamalama is an...
The predictions made in this paper about sound propagation situations referred to in the title are based on an analysis of the propagation of acoustic wave motion from an explosive point source of a wide spectral range placed in the corresponding benchmark models: a wedge of fluid and a half-space of fluid, each of which is over an elastic solid bottom where the shear-wave velocity is less...
The issuance of tsunami warnings constitutes a pivotal measure aimed at preserving human life and lessening the impact on local communities. The moment magnitude of the P wave (Mwp) alongside the rupture time duration (Tdur) can be employed as rapid parameters for disseminating tsunami warnings. In this manuscript, we analyze the seismic waveform data sourced from a global network to ascertain...
We review opportunities afforded by emerging optical submarine cable-based technologies for sensing the marine environment including earthquakes, water waves and explosions. The goal of the submarine fiber sensing Working Group is to enable tsunami early warning based on operational submarine cables. Monitoring changes in water height and temperature in the deep ocean is challenging because...
This work investigates the T-phase time residuals (defined as differences between the observed arrival times and their theoretical values) at IMS hydrophone stations HA11 and HA3 in the Pacific Ocean. The work is focused on T-phases from earthquakes in the Ring of Fire recorded between 2001 and 2024. Time residuals of T phases from these regions can typically range from minus 150 to 150...
The peril associated with the eruption of Rokatenda Volcano is not solely attributed to its eruptive products, but it also possesses the capacity to induce a tsunami. This investigation seeks to simulate the timing of tsunami arrival and its height, as well as to model the inundation effects stemming from a landslide estimation that could precipitate a tsunami following an eruption of...
