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Detection of Earth's Free Oscillation Modes Based on NTFT
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Yingqi ZHANG1, Gong XU1, Chenchen WANG1, Zheng MU1, Yaxin ZHAO1
Journal of Geodesy and Geodynamics | 2025, 45(1) : 86 - 90
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Journal of Geodesy and Geodynamics | 2025, 45(1): 86-90
Detection of Earth's Free Oscillation Modes Based on NTFT
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Yingqi ZHANG1, Gong XU1, Chenchen WANG1, Zheng MU1, Yaxin ZHAO1
Affiliations
  • 1 School of Civil Engineering and Geomatics, Shandong University of Technology, 266 West-Xincun Road, Zibo 255000, China

    • ZHANG Yingqi, postgraduate, majors in principles and applications of geodesy,

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ZHANG Yingqi, postgraduate, majors in principles and applications of geodesy,

Published: 2025-01-15 doi: 10.14075/j.jgg.2024.02.085
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Large earthquakes can simultaneously excite numerous normal modes of Earth's free oscillations. Due to the Earth's ellipticity, rotation, and internal anisotropy, these normal modes undergo splitting, with frequencies of splitting modes becoming very close(only a few μHz apart). This imposes higher demands on the detection of Earth's free oscillation modes. This article derives and verifies a new method for detecting free oscillation modes based on normal time-frequency transform(NTFT). Taking the detection of 3S1 splitting modes as an example, compared with the classical FT spectrum method and the latest OSE method, our method has higher frequency resolution for detecting free oscillation modes.

normal time-frequency transform  /  Fourier transform  /  optimal sequence estimation  /  peak splitting  /  mode detection
张英琦, 徐工, 王辰晨, 穆峥, 赵亚鑫. 基于NTFT的地球自由振荡模型检测. 大地测量与地球动力学, 2025 , 45 (1) : 86 -90 . DOI: 10.14075/j.jgg.2024.02.085
Yingqi ZHANG, Gong XU, Chenchen WANG, Zheng MU, Yaxin ZHAO. Detection of Earth's Free Oscillation Modes Based on NTFT[J]. Journal of Geodesy and Geodynamics, 2025 , 45 (1) : 86 -90 . DOI: 10.14075/j.jgg.2024.02.085
Funding
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  • National Natural Science Foundation of China(41704003)
Appendix
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Year 2025 volume 45 Issue 1
28
10
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Article Info
doi: 10.14075/j.jgg.2024.02.085
  • Receive Date：2024-02-29
  • Online Date：2026-10-30
  • Published：2025-01-15
Article Data
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History
  • Received：2024-02-29
Funding
National Natural Science Foundation of China(41704003)
Affiliations
    1 School of Civil Engineering and Geomatics, Shandong University of Technology, 266 West-Xincun Road, Zibo 255000, China
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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