地球固体潮观测对验证各种地球模型、研究地球内部构造具有重要意义，可为地震预报提供重要的参考依据。BBVS-120甚宽带地震计具有较低的自噪声水平，在低频端输出信号的频率很低，涵盖固体潮信息频带范围。本文首次提出：BBVS-120地震计输出信号中存在周日波、半日波和1/3日波的固体潮信号，利用小波分析，提取垂直分量中的重力固体潮信号，并作调和分析。

Earth solid tide is a cyclic deformation caused by Sun, Moon and other celestial bodies attract Earth. Earth solid tide observations has great significance in validate various Earth models and study the internal structure of Earth, can provide an important reference for earthquake prediction also. BBVS-120 very broadband seismometer has a lower noise level, output signal frequency is very low at the low frequency end, including tidal information frequency band. This article first propose there are diurnal tide, semidiurnal tide and 1/3 diurnal tide in output signal of BBVS-120 seismometer, extract the gravity solid tide with wavelet analysis in the vertical signal from the seismometer and harmonic analysis of the extracts.