大地测量与地球动力学2025，Vol.45Issue(9)：929-936,8.DOI:10.14075/j.jgg.2024.08.414
宜昌站伸缩仪M2波潮汐因子变化特征及影响因素
Variation Characteristics and Influencing Factors of M2 Wave Tidal Factor of Extensometer at Yichang Seismic Station
涂先新 1吕品姬 1翁骋 1安一凡 1曾智辉 1王慧1
作者信息
- 1. 中国地震局地震大地测量重点实验室,武汉市洪山侧路40号,430071||湖北省地震局,武汉市洪山侧路48号,430071
- 折叠
摘要
Abstract
We select the hourly data of two components of extensometer at Yichang station from 2013 to 2023,calculate the M2 wave tidal factors of the two components,perform variational mode decom-position(VMD)on them,and compute the power spectral density(PSD)for each decomposition re-sults.Based on this,a Hilbert time-frequency analysis is conducted.The results show that NS com-ponent contains information with a frequency of 0.002 7/d,which may be related to the annual varia-tion of water level in the Three Gorges reservoir(with a frequency of 0.002 7/d)and the current geo-logical stress state.The EW component contains information with a frequency of 0.004-0.012/d,which may be related to the rapid changes of water level during the flood season in Three Gorges res-ervoir(with frequencies of 0.004-0.007/d and 0.010-0.013/d).Combining the VMD decomposition results of tidal factors and earthquake events with magnitude above 4.0 within 200 km of Yichang sta-tion,abnormal high value is observed in the detailed information of EW component tidal factor before the Badong M5.1 earthquake in 2013.Additionally,in terms of meteorological factors,the tidal fac-tors do not exhibit a regular annual variation similar to temperature.However,trend changes in air temperature lead to cave temperature changes,which has a certain impact on the variation trend of tid-al factors.关键词
M2波潮汐因子/VMD分解/Hilbert时频分析Key words
M2 wave tidal factor/VMD decomposition/Hilbert time-frequency analysis分类
天文与地球科学引用本文复制引用
涂先新,吕品姬,翁骋,安一凡,曾智辉,王慧..宜昌站伸缩仪M2波潮汐因子变化特征及影响因素[J].大地测量与地球动力学,2025,45(9):929-936,8.
