A5008824262- Underwater Acoustics Research
- Seismic Waves and Analysis
- Marine animal studies overview
- Underwater Vehicles and Communication Systems
- Seismic Imaging and Inversion Techniques
- Arctic and Antarctic ice dynamics
- Geophysics and Sensor Technology
- Oceanographic and Atmospheric Processes
- Drilling and Well Engineering
- Geological and Geophysical Studies
- Advanced Fiber Optic Sensors
- Geophysical Methods and Applications
- Remote Sensing and LiDAR Applications
Norwegian University of Science and Technology
2021-2024
PTT Public Company Limited (Thailand)
2021-2023
Acoustics (Norway)
2022-2023
Abstract Our oceans are critical to the health of our planet and its inhabitants. Increasing pressures on marine environment triggering an urgent need for continuous comprehensive monitoring stressors, including anthropogenic activity. Current ocean observational systems expensive have limited temporal spatial coverage. However, there exists a dense network fibre-optic (FO) telecommunication cables, covering both deep coastal areas around globe. FO cables untapped potential advanced acoustic...
In a post-industrial whaling world, flagship and charismatic baleen whale species are indicators of the health our oceans. However, traditional monitoring methods provide spatially temporally undersampled data to evaluate mitigate impacts increasing climatic anthropogenic pressures for conservation. Here we present first case wildlife using distributed acoustic sensing (DAS). By repurposing globally-available infrastructure sub-sea telecommunication fiber optic (FO) cables, DAS can (1)...
Distributed acoustic sensing (DAS) transforms submarine telecommunication cables into densely sampled seismic receivers. To demonstrate DAS applications for imaging, we have used an optical cable on the seafloor in Trondheimsfjord, Norway, to record data generated by a controlled source. The are simultaneously recorded towed hydrophone array and fiber-optic cable. Following our processing methods, can produce images of underlying geologic structures from data. We find that comparable...
Distributed acoustic sensing (DAS) leverages an ocean-bottom telecommunication fiber-optic cable into a densely sampled array of strain sensors. We demonstrate DAS applications to passive monitoring through experiment on submarine in Longyearbyen, Svalbard, Norway. find that can measure many types signals the frequency range from 0.01 20 Hz generated by dynamics atmosphere, ocean, and solid earth. These include loading pressure fluctuation ocean surface waves storms, winds, airflow...
Climate change is impacting the Arctic faster than anywhere else in world. As a response, ecosystems are rapidly changing. result, we can expect rapid shifts whale migration and habitat use concurrent with changes human patterns. In this context, responsible management conservation requires improved monitoring of presence movement over large ranges, at fine scales near-real-time compared to legacy tools. We demonstrate that could be enabled by Distributed Acoustic Sensing (DAS). DAS converts...
We investigate the feasibility of distributed acoustic sensing (DAS) for marine traffic monitoring in Trondheimsfjord, Norway. deployed a DAS system on fiber-optic telecommunication cable trenched at seabed fjord and recorded continuous signals generated by passing vessels. In this study, we if an alternative method workflow can be used to monitor despite noisy environment poor coupling surrounding sediments. apply 2D image processing techniques various signal filters data achieve further...
In time-lapse (also called 4D) seismic analysis, the time shift of a certain reflection event is caused by changes in velocity and depth event. An interpretation 4D shifts normally simplified neglecting displacement (strains) or assuming linear relations between thickness strains. Here, we go beyond these assumptions propose least-squares optimization method to simultaneously estimate strains vertical transverse isotropic media from angle-dependent Through examples synthetic field data, show...
Shear-wave (S-wave) resonances are typically observed when the surficial marine sediments over a rock substrate have relatively low S-wave velocities. We observe these phenomena using ocean-bottom fiber-optic distributed acoustic sensing (DAS) in two subsea telecommunication cables Svalbard, Norway. Strong seismic energy from sufficiently large earthquakes is required to trigger and enhance multiple-order modes of resonances. Here, we use interpreted resonance frequencies first determine...
In a post-industrial whaling world, flagship and charismatic baleen whale species are indicators of the health our oceans. However, traditional monitoring methods provide spatially temporally undersampled data to evaluate mitigate impacts increasing climatic anthropogenic pressures for conservation. Here we present first case wildlife using distributed acoustic sensing (DAS). By repurposing globally-available infrastructure sub-sea telecommunication fiber optic (FO) cables, DAS can (1)...
Summary For this extended abstract, a 120 km long fibre-optic cable has been used to enhance the Signal-to-Noise Ratio of recorded P- and S-wave signals from local earthquake estimate hypocenter location. The Distributed Acoustic Sensing (DAS) technique provides unique possibility increase receiver density globally. It can, for example, improve detection rate small, induced earthquakes in CO2 storage sites or producing oil gas fields. This work shows how DAS alone can be locate small...
Our oceans are critical to the health of our planet and its inhabitants. Increasing pressures on marine environment triggering an urgent need for continuous comprehensive monitoring stressors, including anthropogenic activity. Current ocean observational systems expensive have limited temporal spatial coverage. However, there exists a dense network Fibre-Optic (FO) telecommunication cables, covering
Summary In a time-lapse (also called 4D) seismic analysis, the time-shift of certain event is caused by changes in velocity and depth event. An interpretation 4D time-shifts normally simplified neglecting displacement (strains) or assuming linear relation thickness strains. Here we go beyond these assumptions propose least-squares inversion method to simultaneously estimate strains from angle stacks. We show, through examples synthetic field data, that can be estimated without an assumption...
Distributed acoustic sensing (DAS) transforms submarine telecommunication cables into densely sampled seismic receivers. To demonstrate DAS applications for imaging, we use an optical cable on the seafloor in Trondheim Fjord, Norway, to record data generated by a controlled source. The are simultaneously recorded towed hydrophone array and fiber optic cable. Following our processing methods, can produce images of underlying geological structures from both data. We find that have comparable...
Abstract Among major seismic imaging challenges in Vulcan Sub-basin of Timor Sea, Australia, the presence thick, high-velocity, and faulted Tertiary carbonates shallow section overlaid with low acoustic impedance contrast within a soft Cretaceous claystone at target reservoir makes water multiples most prominent artifacts this exploration area. The challenge frontier environment is mainly from inefficient water-layer-related (WLRMs) attenuation. primary reflectors are contaminated short...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Geophysical Research - Oceans. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Observation atmospheric oceanic dynamics using ocean-bottom distributed acoustic sensingAuthorsKittinatTaweesintananoniDMartinLandrøiDStåle EmilJohansenJohn...