Table 1 Specifications and observational periods of the stations

Number of OBS

74

74

74

Number of land station

15

15

48

Method

1. Hypocenter location using a simplified 3-D model

2. Focal mechanisms using a simplified 3-D model

1. Initial hypocenter location using 1-D model

2. Seismic tomography

1. Initial hypocenter location using 1-D model

2. Seismic tomography

3. Focal mechanisms using the 3-D velocity structure by tomography

4. RF analysis