Table 2 Source parameters of the EGF1 event (foreshock) and the EGF2 event (aftershock)

Origin time (JST)^a

2016/04/14, 23:43

2016/04/16, 09:48

Depth (km)^a

14.2

15.9

Seismic moment (N m)^b

2.71 × 10¹⁶

6.27 × 10¹⁶

M ^b_w

4.9

5.2

Strike, dip, rake (deg.)^b

279, 67, −22

230, 38, −112

V _s (km/s)^c

3.4

3.4

Corner frequency (Hz)

1.20

0.73

Fault length (km)

1.86

3.01

Stress parameter (MPa)

10.3

5.4