| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
LIU Yanan, LIU Baohua, LIU Chenguang, HUA Qingfeng, YAN Wenhua. Research on seismic background noise in the Eastern Subbasin of the South China Sea[J]. Marine Geology & Quaternary Geology, 2021, 41(2): 109-117. doi: 10.16562/j.cnki.0256-1492.2020051501
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Research on seismic background noise in the Eastern Subbasin of the South China Sea
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Abstract
The intensity of background noise is an important factor that affects the observation of seismic stations. Acquiring the characteristics of the background noise is of great significance to the evaluation of the quality of the data recorded by the Ocean Bottom Seismometer (OBS) and the noise reduction of the recorded data. Using the Probability Density Function (PDF) method to obtain the probability distribution characteristics of the Power Spectral Density (PSD) of the recorded data and comparing them with the results of new high-noise model (NHNM) and new low-noise model (NLNM) is a favorable method to research the background noise level around the station. Based on the long-term observation data of a large-scale passive source OBS array in the South China Sea (SCS), the background noise in the SCS is studied by using the PDF method. Firstly, the background noise in the whole frequency band is analyzed and compared with that from other stations. It is found that the background noise in the ocean is greater than the NHNM in the microseisms and low frequency band, and far greater than the background noise of the land-based station in the whole frequency band, which indicates that the data quality of the OBS is poor. Secondly, the probability density distribution of the earthquakes and other signals in the observation process is summarized, and it is found that the teleseismic, near earthquake and data dropout signal have different dominant frequency bands respectively, which has important significance for subsequent filtering processing and quality inspection. Finally, the time variation characteristics of background noise are studied, and it is found that typhoon is the main cause of time variation in microseisms period.
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References
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LIU Yanan, LIU Baohua, LIU Chenguang, HUA Qingfeng, YAN Wenhua. Research on seismic background noise in the Eastern Subbasin of the South China Sea[J]. Marine Geology & Quaternary Geology, 2021, 41(2): 109-117. doi: 10.16562/j.cnki.0256-1492.2020051501
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Figure 1.
Location map of the stations The red stars represent OBS stations, orange double dotted lines represent extinct spreading ridges, the pink solid line with triangles represents the Manila subduction zone.
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Figure 2.
The PDF of station HY15 The two blue solid lines represent NHNM and NLNM. The black solid line represents the mode value.
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Figure 3.
The PDF of station HY17The two blue solid lines represent NHNM and NLNM. The black solid line represents the mode value.
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Figure 4.
The PDF of station AnkangThe two blue solid lines represent NHNM and NLNM. The black solid line represents the mode value.
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Figure 5.
The waveform of teleseismic of station HY16
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Figure 6.
The waveform of near earthquake of station HY17
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Figure 7.
The data dropout signal of station HY15
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Figure 8.
The PDF of teleseismic, near earthquake and data dropout signal The top panel represents teleseismic, the middle panel represents near earthquake, the bottom panel represents data dropout signal. The two blue solid lines represent NHNM and NLNM. The black solid line represents the mode value.
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Figure 9.
The map of time variation of PSD of background nose. The above three maps are results of station HY15 From left to right, they are vertical component, horizontal component 1 and horizontal component 2 respectively. The following three pictures are results of station HY17.