Analysis of background noise level of PET/gPhone gravimeter in Mainland China
The broadband seismometer or gravimeter installed on the surface of the earth record not only the seismic wave signal excited by the big earthquake, but also the continuous weak high-frequency vibration signal, which is the earth background noise. Therefore, the research on the background noise of t...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
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Editorial Office of Reviews of Geophysics and Planetary Physics
2022-05-01
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| Series: | 地球与行星物理论评 |
| Subjects: | |
| Online Access: | https://www.sjdz.org.cn/en/article/doi/10.19975/j.dqyxx.2021-058 |
| _version_ | 1797858720341819392 |
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| author | Jianing Gou Xiaotong Zhang Ying Jiang Hao Zhou Gongzhe Wei Ziwei Liu |
| author_facet | Jianing Gou Xiaotong Zhang Ying Jiang Hao Zhou Gongzhe Wei Ziwei Liu |
| author_sort | Jianing Gou |
| collection | DOAJ |
| description | The broadband seismometer or gravimeter installed on the surface of the earth record not only the seismic wave signal excited by the big earthquake, but also the continuous weak high-frequency vibration signal, which is the earth background noise. Therefore, the research on the background noise of the gravimeter is helpful for the site selection of the station, the adjustment of the instrument, the judgment of whether the instrument has the ability to detect the normal mode of earthquake in the near future, and the detection of weak geodynamic signals. In order to evaluate the background noise level of PET/gPhone gravimeters of the National Gravity Network of China, we collected and processed 4-yr continuous gravity data recorded by the 52 PET/gPhone gravimeters from 2014 to 2017. The power spectral density during the quiet period of the gravimeter will be used as an estimate of the background noise level. Firstly, we compared and analyzed the existing background noise level calculation methods, and proposed an improved data selection strategy (called DaySNM method) for SNM (seismic noise level). Then we calculated background noise level at seismic frequency band (200～600 s) based on the Banka method(Banka and Crossley, 1999), presenting a new low-noise level model (CN-NLNM) by fitting the lower envelope of 52 power spectral density curves. Finally, the spatial distribution map of background noise in mainland China was obtained by Continuous Curvature Spline Interpolation with the SNM data. The results show that: (1) DaySNM method can find a lower SNM, compared with the Banka and Bandpass method. (2) the variation range of SNM in mainland China is 2.013 (Yutian station)～4.654 (Yinchuan station). (3) SNM of gravimeters in coastal areas generally larger than inland, indicating that ocean noise may be the main reason for the greater noise of coastal stations; (4) SNM in North China, eastern and northern Qinghai-Tibet Plateau is huge, which may be related to the frequent tectonic activities in these areas. |
| first_indexed | 2024-04-09T21:17:56Z |
| format | Article |
| id | doaj.art-f4614e6f1f4e4e76ba32dafa9ec1f4f3 |
| institution | Directory Open Access Journal |
| issn | 2097-1893 |
| language | zho |
| last_indexed | 2024-04-09T21:17:56Z |
| publishDate | 2022-05-01 |
| publisher | Editorial Office of Reviews of Geophysics and Planetary Physics |
| record_format | Article |
| series | 地球与行星物理论评 |
| spelling | doaj.art-f4614e6f1f4e4e76ba32dafa9ec1f4f32023-03-28T07:02:47ZzhoEditorial Office of Reviews of Geophysics and Planetary Physics地球与行星物理论评2097-18932022-05-0153337037710.19975/j.dqyxx.2021-0582021-058Analysis of background noise level of PET/gPhone gravimeter in Mainland ChinaJianing Gou0Xiaotong Zhang1Ying Jiang2Hao Zhou3Gongzhe Wei4Ziwei Liu5Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, ChinaKey Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, ChinaKey Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, ChinaKey Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, ChinaKey Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, ChinaKey Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, ChinaThe broadband seismometer or gravimeter installed on the surface of the earth record not only the seismic wave signal excited by the big earthquake, but also the continuous weak high-frequency vibration signal, which is the earth background noise. Therefore, the research on the background noise of the gravimeter is helpful for the site selection of the station, the adjustment of the instrument, the judgment of whether the instrument has the ability to detect the normal mode of earthquake in the near future, and the detection of weak geodynamic signals. In order to evaluate the background noise level of PET/gPhone gravimeters of the National Gravity Network of China, we collected and processed 4-yr continuous gravity data recorded by the 52 PET/gPhone gravimeters from 2014 to 2017. The power spectral density during the quiet period of the gravimeter will be used as an estimate of the background noise level. Firstly, we compared and analyzed the existing background noise level calculation methods, and proposed an improved data selection strategy (called DaySNM method) for SNM (seismic noise level). Then we calculated background noise level at seismic frequency band (200～600 s) based on the Banka method(Banka and Crossley, 1999), presenting a new low-noise level model (CN-NLNM) by fitting the lower envelope of 52 power spectral density curves. Finally, the spatial distribution map of background noise in mainland China was obtained by Continuous Curvature Spline Interpolation with the SNM data. The results show that: (1) DaySNM method can find a lower SNM, compared with the Banka and Bandpass method. (2) the variation range of SNM in mainland China is 2.013 (Yutian station)～4.654 (Yinchuan station). (3) SNM of gravimeters in coastal areas generally larger than inland, indicating that ocean noise may be the main reason for the greater noise of coastal stations; (4) SNM in North China, eastern and northern Qinghai-Tibet Plateau is huge, which may be related to the frequent tectonic activities in these areas.https://www.sjdz.org.cn/en/article/doi/10.19975/j.dqyxx.2021-058pet/gphone gravimeterbackground noise levelseismic noise magnitudepower spectral density |
| spellingShingle | Jianing Gou Xiaotong Zhang Ying Jiang Hao Zhou Gongzhe Wei Ziwei Liu Analysis of background noise level of PET/gPhone gravimeter in Mainland China 地球与行星物理论评 pet/gphone gravimeter background noise level seismic noise magnitude power spectral density |
| title | Analysis of background noise level of PET/gPhone gravimeter in Mainland China |
| title_full | Analysis of background noise level of PET/gPhone gravimeter in Mainland China |
| title_fullStr | Analysis of background noise level of PET/gPhone gravimeter in Mainland China |
| title_full_unstemmed | Analysis of background noise level of PET/gPhone gravimeter in Mainland China |
| title_short | Analysis of background noise level of PET/gPhone gravimeter in Mainland China |
| title_sort | analysis of background noise level of pet gphone gravimeter in mainland china |
| topic | pet/gphone gravimeter background noise level seismic noise magnitude power spectral density |
| url | https://www.sjdz.org.cn/en/article/doi/10.19975/j.dqyxx.2021-058 |
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