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Table 1 The five-layer half-space Earth model used in the prediction of co- and postseismic gravity changes

From: Monthly GRACE detection of coseismic gravity change associated with 2011 Tohoku-Oki earthquake using northern gradient approach

Depth (km)

Density ( ρ ) (10 3kg m −3 )

V P (km s −1 )

V S (km s −1 )

Viscosity ( η ) (10 19Pa s)

Material type

0-1

2.10

2.10

1.00

Elastic

1-8

2.70

6.00

3.40

Elastic

8-15

2.90

6.60

3.70

Elastic

15-22

3.05

7.20

4.00

Elastic

22-∞

3.40

8.20

4.70

0.93

Maxwell body

  1. The layer depths, densities, and seismic velocities are extracted from the CRUST2.0 global tomography model (Bassin et al. 2000), and the viscosity of the upper mantle is quoted from Sato et al. (1981) and Suito and Hirahara (1999).