Fig. 1
Distribution of the observation stations used for the inversion analysis. A rectangle shows the projection of the assumed fault plane. A star indicates the rupture starting point. Red circles are aftershocks, relocated by JMA unified catalog for 24 hours after the main shock. Circle, triangles, and rectangles show observation stations. Their symbles are changed according to the velocity strcuture models.

Fig. 2
Velocity structure models. Blue and red lines show P-wave and S-wave velocity, respectively.

Fig. 3
Top: Total slip distribution. The largest slip occured at the hypocenter.

Bottom: Moment rate funcions.

Fig. 4
Comparison between observed and synthetic waveforms. Solid lines under records of NIG021, NIG022, and NIGH011 represent pulses generated from asperity (c).

Fig. 5
Time progression of rupture. Rupture propagated toward east.

References

Previous version
--The main differences--

• A common velocity strucuture model (Ukawa et al., 1984) is used.
• The fault size is 30kmx18km.
• The frequency range for the analysis is 0.1-0.6Hz.
• 7 K-NET and KiK-net stations are used.