iGrav-007 SG and Detection of the Spherical Free Oscillation Modes ₀S_m

iGrav Superconducting Gravimeter is the newest portable gravimeter with high accuracy in the world, which provides the most stable relative gravity measurement. Based on Tsoft software, this paper processed the consecutive iGrav-007 observation data of 5 months at Wuhan Jiufeng Station. Correction of station air pression and variations of polar motion on the gravity field and analysis of the nature of gravity residual error and drifting was made. Through the spectrum analysis, detaction of the spherical free oscillation modes ₀S_m caused by the 2013 Lushan Earthquake(Mw=6.6) was made. The result of detaction is evident. It comprehensively shows that iGrav-007 having a good performance on observation.