Postseismic gravity changes after the 2011 Tohoku earthquake observed by superconducting gravimeters at Mizusawa, Japan

Earth, Planets and Space

Table 2 Results of fitting Eq. (5) to the gravity data at Mizusawa (39.1°N, 141.1°E) from GRACE/GRACE-FO processed with eight different filters (DDK1–8) and no filter

Filter	Linear	Coseismic	Postseismic		Standard deviation of residuals (µGal)
Filter	\({b}^{(S)}\)(µGal/yr)	\({\xi }^{(S)}\)(µGal)	\({\zeta }^{(S)}\)(µGal)	\({\tau }^{(S)}\)(day)	Standard deviation of residuals (µGal)
DDK1	0.030 ± 0.021	− 2.31 ± 0.19	6.3 ± 2.1	5398 ± 2622	0.50
DDK2	− 0.015 ± 0.030	− 4.21 ± 0.26	10.4 ± 1.3	3656 ± 758	0.64
DDK3	− 0.055 ± 0.044	− 6.69 ± 0.37	15.2 ± 1.6	3444 ± 599	0.86
DDK4	− 0.062 ± 0.050	− 7.33 ± 0.42	16.1 ± 1.8	3394 ± 604	0.95
DDK5	− 0.077 ± 0.065	− 8.22 ± 0.54	17.9 ± 2.4	3475 ± 729	1.22
DDK6	− 0.085 ± 0.072	− 8.40 ± 0.59	18.5 ± 2.6	3497 ± 790	1.35
DDK7	− 0.099 ± 0.085	− 8.62 ± 0.70	19.3 ± 3.0	3450 ± 861	1.60
DDK8	− 0.101 ± 0.088	− 8.71 ± 0.72	19.4 ± 3.0	3392 ± 848	1.65
none	− 0.101 ± 0.091	− 9.06 ± 0.75	19.3 ± 2.7	3094 ± 712	1.71

Hydrological contributions (GLDAS-2.1) have been subtracted from GRACE/GRACE-FO time series. For the definition of the parameters \({b}^{(S)}\), \({\xi }^{(S)}\), \({\zeta }^{(S)}\) and \({\tau }^{(S)}\), see the text after Eq. (5)