Abstract:In order to investigate the relationship between the temporal and spatial distribution characteristics of gravity tide parameters and earthquake gestation, this paper takes the 2013 Lushan M7.0 earthquake as an example. The continuous gravity observation data of 17 stations in the vicinity of the Lushan earthquake area are collected and analyzed. The parameters of the daily and half-day wave tidal parameters are analyzed by VAV harmonic analysis method. The tidal factors of the half-day M2 wave are studied with time trend and spatial distribution. The results show that the spatial distribution of the trend of the trend of the M2 wave tidal factor before the Lushan earthquake generally shows a four-quadrant distribution of rising and falling trends. The Lushan earthquake is at the center of the four quadrants, which may be caused by the “locking shear force” existing before the earthquake deformation or density disturbance.
HUANG Ya,SHEN Chongyang,WEI Jin et al. Temporal and Spatial Variation of Gravity Tide Parameters before the Lushan M7.0 Earthquake in 2013[J]. jgg, 2020, 40(2): 165-169.