Abstract：Gravity gradient is the main physical parameters in gravity measurements，6 components of the gravity gradient contain more information about the earth than usual gravity measurement. The co-seismic space distribution and temporal variation of the gravity gradient are analized acooeding to the results computed with 112 periods GRACE observed during Jan.,2003 and Jan.,2012 for the area of Japan 9.0 earthquake，based on the spherical function formulas of the 6 components of the gravity gradient in earth fixed coordinate. The theory and methods to eliminate singularity of the spherical function formulas of the 6 components of the gravity gradient are discussed. The results show that the component Tλλ,Trr,Tθλ of gravity gradients are consistent with the tectonics in the area. Temporal variation of the 6 components of the gravity gradient in about 1 year before the earthquake appeared anomaly，and the coseismic variation of the 6 components of the gravity gradient are also obvious.
$author.xingMing_EN,$author.xingMing_EN,$author.xingMing_EN et al. TEMPORAL AND SPACE CONTRIBUTION OF GRAVITY GRADIENTS IN
JAPAN MW 9.0 EARTHQUAKE AREA[J]. jgg, 2013, 33(6): 1-4.
