Table 1 Summary of settings in waveform inversion analysis

Origin time^a

2016/04/14 21:26:34.43

2016/04/16 01:25:05.47

Epicenter^a

32.7417°N, 130.8087°E

32.7545°N, 130.7630°E

Hypocenter depth^a

11.39 km

12.45 km

Fault segment

#1

#2

Strike/dip

212°/89°

205°/72°

235°/65°

Rake angle variation

−164° ± 45°

−142° ± 45°

−142° ± 45°

Length

14 km

14 km

28 km

Width

13 km

18 km

18 km

Subfault size

1 km × 1 km

2 km × 2 km

Number of subfaults

182

63

126

Number of time windows

5

9

Duration/time-shift of time window

1.0 s/0.5 s

1.0 s/0.5 s

Target frequency range

0.05–1 Hz

0.05–0.5 Hz

Resampling of data

10 Hz

5 Hz

Number of stations

13

15