Superconduct gravimeter (SG) has a wide dynamical linear measure range and low noise level, so it is the most precision device used to monitor the vertical distortion and gravity field. Global Geodynamics Projects (GGP) researches geophysics and geodynamical by using continuous synchronization observe data which come from worldwide distributed SGs. WHIGG is the exclusive research institute participating in this international cooperation.

On March 11 at 1:46pm BJT a massive 9.0-magnitude earthquake occurred near the northeastern coast of Japan, creating extremely destructive tsunami waves which hit Japan just minutes after the earthquake, and triggering evacuations and warnings across the Pacific Ocean. The earthquake resulted in a big global free oscillation. SG(C032) of Wuhan Geodesy Field Scientific Observatory(WHIGG) not only recorded the big hit, but also detected the earth free oscillation triggered by the earthquake. The real measurement earth free oscillation vibration mode can be used to constrain the research the deep interior of the earth, the ellipticity of the earth and the rotation of the Earth