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Table 4 Parameters of the earthquake of 2016/04/16 01:25 (Mw 7.1)

From: Strong ground motion simulations of the 2016 Kumamoto earthquakes using corrected empirical Green’s functions: methods and results for ESG6 blind prediction Steps 2 and 3 with improved parameters

 

Subevent 1

Subevent 2

Subevent 3

Strike*

205\(^\circ\)

235\(^\circ\)

235\(^\circ\)

Dip*

72\(^\circ\)

60\(^\circ\)

60\(^\circ\)

Seismic moment

0.4E + 18 Nm

0.3E + 18 Nm

1.0E + 18 Nm

Rupture propagation velocity

2.5 km/s

2.5 km/s

2.5 km/s

Rise time

0.5 s

0.3 s

0.8 s

Length and width

3 km, 3 km

3 km, 3 km

4 km, 4 km

Number of divisions

(along strike, along dip, time)

(3, 3, 3)

(3, 3, 3)

(4, 4, 4)

Relative rupture time from the origin time

0.0 s

1.0 s

3.5 s

Small earthquake for phase spectra (strike, dip, rake)**

2016-04-17 04:46 (MJ 4.5) (181, 82, 150)

2016-04-21 21:52 (MJ 4.0) (262, 78, − 26)

2016-04-21 21:52 (MJ 4.0) (262, 78, -26) or 2016-04-18

08:35 (MJ 4.2) (98, 61, − 112)***

  1. * Strike and dip angles were obtained from an analysis of crustal deformation by the Geospatial Information Authority of Japan (GSI) (see Availability of Data and Materials for details)
  2. ** From F-net
  3. *** The earthquake of 2016-04-21 21:52 was used at KMM008, KMMH14, and NGS012 because of the availability of the observed data. The earthquake of 2016-04-18 08:35 was used at other sites