Pankun: A New Generation of Broadband Ocean Bottom Seismograph

Liu, Dan; Yang, Ting; Wang, Yizhi; Wu, Yuechu; Huang, Xinfeng

doi:10.3390/s23114995

Cited by 2 publications

(2 citation statements)

References 21 publications

(33 reference statements)

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“…Various types of OBSs may respond differently to the impingements of bottom currents due to their different physical form factors. In this experiment, we use a typical passive-source OBS called Pankun, developed by the OBS Lab at the Southern University of Science and Technology (SUSTech) (Liu et al, 2022(Liu et al, , 2023Wang et al, 2022). As shown in Figure 1, Pankun is a passive-source OBS adopting the standard layout, which separates the sensor from the mainframe once deployed.…”

Section: Instrumentation and Experiments Settingsmentioning

confidence: 99%

Current‐Induced Noise in Ocean Bottom Seismic Data: Insights From a Laboratory Water Flume Experiment

Yang

Liu

et al. 2023

Earth and Space Science

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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.

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Section: Instrumentation and Experiments Settingsmentioning

confidence: 99%

Current‐Induced Noise in Ocean Bottom Seismic Data: Insights From a Laboratory Water Flume Experiment

Yang

Liu

et al. 2023

Earth and Space Science

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“…The studies of the OBSIP project [4][5][6], like many others [7][8][9], are primarily focused on determining the deep structure of the crust and upper mantle, rather than studying the seismic regime, which requires a longer recording period. For this purpose, permanent cabled OBS networks located in seismically active zones are more suitable.…”

Section: Introductionmentioning

confidence: 99%

Features of Seismological Observations in the Arctic Seas

Krylov,

Novikov,

Kovachev

et al. 2023

JMSE

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This paper is devoted to the features of seismological observations in the Arctic seas, which are complicated by harsh climatic conditions, the presence of ice cover, stamukhi and icebergs, and limited navigation. Despite the high risk of losing expensive equipment, the deployment of local networks of bottom seismographs or stations installed on ice is still necessary for studying the seismotectonic characteristics and geodynamic processes of the region under consideration, the deep structure of the crust and upper mantle, seismic hazards, and other marine geohazards. Various types of seismic stations used for long-term and short-term deployments in the Russian sector of the Arctic Ocean, as well as various schemes and workflows for their deployment/recovery, are described. The characteristics of seafloor seismic noise and their features are also considered. The results of deployments demonstrate that the characteristics of the stations make it possible to reliably record earthquake signals and seismic noise. Based on the experience gained, it was concluded that the preferred schemes for deploying ocean-bottom seismographs are those in which their subsequent recovery does not depend on their power resources. Usually, such schemes allow for the possibility of dismantling stations via trawling and are suitable for the shelf depths of the sea. The advantages of such schemes include the possibility of installing additional hydrophysical and hydrobiological equipment. When using pop-up ocean-bottom seismographs, special attention should be paid to the careful planning of the recovery because its success depends on the possibility of a passage to the deployment site, which is not always possible due to changing meteorological and ice conditions. Seismic records obtained on the seafloor are characterized by a high noise level, especially during periods of time when there is no ice cover. Therefore, it is recommended to install bottom stations for periods of time when ice cover is present. The frequency range of the prevailing noise significantly overlaps with the frequency range of earthquake signals that must be taken into account when processing bottom seismic records.

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Pankun: A New Generation of Broadband Ocean Bottom Seismograph

Cited by 2 publications

References 21 publications

Current‐Induced Noise in Ocean Bottom Seismic Data: Insights From a Laboratory Water Flume Experiment

Current‐Induced Noise in Ocean Bottom Seismic Data: Insights From a Laboratory Water Flume Experiment

Features of Seismological Observations in the Arctic Seas

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