A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Near-surface characterization using shear-wave resonances: A case study from offshore Svalbard, Norway
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 fiber-optic telecommunication cables in Svalbard, Norway. Strong seismic energy from sufficiently large earthquakes is required to trigger and enhance the multiple-order modes of S-wave resonances. Here, we use the interpreted S-wave resonance frequencies of the first two modes to determine the thickness and the S-wave velocity of the near-surface low-velocity layer (LVL) beneath the seafloor. In addition, we use existing active P-wave seismic reflection data to determine the LVL thickness and to help build a more accurate S-wave velocity model from the S-wave resonance frequencies. The estimated S-wave velocity varies laterally within the LVL formation. Here, we find that the sediments or deposits with high S-wave velocity presented in the estimated LVL model agree with the distribution of some glacigenic sediments and landforms deposited in the survey area. Therefore, S-wave resonances measured by ocean-bottom DAS can be used to characterize the corresponding near-surface LVLs
Near-surface characterization using shear-wave resonances: A case study from offshore Svalbard, Norway
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 fiber-optic telecommunication cables in Svalbard, Norway. Strong seismic energy from sufficiently large earthquakes is required to trigger and enhance the multiple-order modes of S-wave resonances. Here, we use the interpreted S-wave resonance frequencies of the first two modes to determine the thickness and the S-wave velocity of the near-surface low-velocity layer (LVL) beneath the seafloor. In addition, we use existing active P-wave seismic reflection data to determine the LVL thickness and to help build a more accurate S-wave velocity model from the S-wave resonance frequencies. The estimated S-wave velocity varies laterally within the LVL formation. Here, we find that the sediments or deposits with high S-wave velocity presented in the estimated LVL model agree with the distribution of some glacigenic sediments and landforms deposited in the survey area. Therefore, S-wave resonances measured by ocean-bottom DAS can be used to characterize the corresponding near-surface LVLs
Near-surface characterization using shear-wave resonances: A case study from offshore Svalbard, Norway
Taweesintananon, Kittinat (author) / Rørstadbotnen, Robin Andre (author) / Landrø, Martin (author) / Johansen, Ståle Emil (author) / Arntsen, Børge (author) / Forwick, Matthias (author) / Hansen, Alfred (author)
2024-06-14
Article (Journal)
Electronic Resource
English
British Library Online Contents | 2014
Governor's headquarters, Svalbard, Norway
| British Library Online Contents | 2001
Svalbard Research Centre, Norway
| British Library Online Contents | 2006
| British Library Online Contents | 2002
Coastal Erosion of Arctic Cultural Heritage in Danger: A Case Study from Svalbard, Norway
| DOAJ | 2021