Source rupture processes of the foreshock and mainshock in the 2016 Kumamoto earthquake sequence estimated from the kinematic waveform inversion of strong motion data

Earth, Planets and Space

Table 1 Summary of settings in waveform inversion analysis

	Foreshock	Mainshock
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