Using Gphone Gravimeter Data To Research Characteristics Of Ocean Tide Loading In Coastal Areas Of China

With the development of the"Crustal Movement Observation Network of China"project,the China Earthquake Administration has set up a nationwide gravity monitoring network,which provides sufficient gravity observation data for the research on the Earth tide.Based on the gravity observation data of the 7 gPhone gravimeter stations,this thesis discusses the suitability of the global ocean tide model in the coastal areas of China.First,the Tsoft data preprocessing software recommended by the international earth tide center is used to modify the interference signals caused by earthquake,speak,step and drift in the observed data.Then,the gravity tidal parameters of the main tidal wave were obtained by using the harmonic analysis software Eterna to analyze the pretreated gravity observation data.The results show that the standard deviation of harmonic analysis is within 16 nm/s²,and achieves high accuracy.The ocean tidal loading correction of the tidal gravity parameters using the most commonly used global ocean tide models FES2004,EOT11a,DTU10,HAMTIDE11a,NAO99b,GOT4.7,TPXO7.2,and TPXO7.2atlas was selected.The results show that:?1?The Observational residuals after ocean tide loading correction are reduced,and the gravity tide parameters after the ocean tidal loading correction have good regional consistency?except for individual stations and individual tidal waves?.For the coastline stations,the consistency of gravity tidal parameters after M₂ ocean tidal loading correction is relatively poor.This may be due to the poor accuracy of the coastal ocean tide models.?2?The ocean tide model has obvious regional applicability,and the tide correction effect is also related to the tidal wave component.?3?From the overall correction effect of ocean tide loading in the coastal area of China,There is little difference in the correction effect of the different ocean tide models on the diurnal tidal waves O₁ and K₁.For the semidiurnal wave M₂,the correction effect of TPXO7.2atlas and GOT4.7 is better than that of the other 6 models.