Current-Induced Noise in Ocean Bottom Seismic Data: Insights From a Laboratory Water Flume Experiment
The ocean-bottom currents are believed to be largely responsible for the high noise level in ocean bottom seismograph (OBS) data, in particular on the horizontal components. Due to the lack of in-situ experiments and measurements, the generation mechanism and characteristics of the current-induced noise are still poorly understood. In this paper, we designed an experiment to explore the features of current-induced noise. A sensor module from a typical passive-source OBS was installed in a water flume that can produce controllable steady water flows. We measured and analyzed the recorded noise with changing current velocities, with and without shielding. With other noise sources, such as infragravity waves precluded, this experiment demonstrates that the currents can generate low-frequency noise, particularly <0.1 Hz. The noise level depends on the current velocity as well as the frequency. While the current-induced noise affects the horizontal components significantly, its impacts on the vertical component appear negligible. The experiment shows that current-induced noise has a dominant direction approximately perpendicular to the currents, a pattern consistent with an actual OBS on the flank of Mariana Trench, where the current direction is supposed to be along the trench. Shielding the sensor module with a plastic casing can substantially suppress the noise, indicating that shielding is a practical, low-cost scheme to reduce the current-induced noise.
First ; Corresponding
National Natural Science Foundation of China;Shenzhen Science and Technology Innovation Program[JCYJ20180504170422082];Shenzhen Science and Technology Innovation Program[KQTD20170810111725321];
|WOS Research Area|
Astronomy & Astrophysics ; Geology
Astronomy & Astrophysics ; Geosciences, Multidisciplinary
|WOS Accession No|
Cited Times [WOS]:0
|Document Type||Journal Article|
|Department||Department of Ocean Science and Engineering|
1.OBS Laboratory,Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,China
2.Shanghai Sheshan National Geophysical Observatory,Shanghai,China
3.Southern Marine Science and Engineering Guangdong Laboratory,Guangzhou,China
4.State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai,China
5.Key Laboratory of Hydrodynamics (Ministry of Education),School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai,China
|First Author Affilication||Department of Ocean Science and Engineering|
|Corresponding Author Affilication||Department of Ocean Science and Engineering|
|First Author's First Affilication||Department of Ocean Science and Engineering|
Wu，Yuechu,Yang，Ting,Liu，Dan,et al. Current-Induced Noise in Ocean Bottom Seismic Data: Insights From a Laboratory Water Flume Experiment[J]. Earth and Space Science,2023,10(6).
Wu，Yuechu,Yang，Ting,Liu，Dan,Dai，Yi,&An，Chao.(2023).Current-Induced Noise in Ocean Bottom Seismic Data: Insights From a Laboratory Water Flume Experiment.Earth and Space Science,10(6).
Wu，Yuechu,et al."Current-Induced Noise in Ocean Bottom Seismic Data: Insights From a Laboratory Water Flume Experiment".Earth and Space Science 10.6(2023).
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