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Table 4. Search range, grid interval, and estimated value of model parameters in the grid search.

From: Source model for strong ground motion generation in the frequency range 0.1–10 Hz during the 2011 Tohoku earthquake

  

l = w (km)*

τ (s)*

C

NSL**

NSW**

Vr (km/s)*

SMGA1 (EGF1)

Search range

5.0–15.0

1.0–3.0

5.0–15.0

1–3

1–3

2.8–4.0

Interval

1.0

0.1

1.0

1

1

0.4

Estimated value

12.0

2.3

12.0

2

3

4.0

SMGA2 (EGF1)

Search range

  

5.0–15.0

1–3

1–3

 

Interval

  

1.0

1

1

 

Estimated value

  

14.0

3

1

 

SMGA3 (EGF2)

Search range

3.0–10.0

0.1–0.6

10.6

1–5

1–5

2.8–4.0

Interval

0.5

0.02

fixed

1

1

0.4

Estimated value

7.0

0.34

10.6

2

3

4.0

SMGA4 (EGF2)

Search range

  

4.0

1–5

1–5

 

Interval

  

fixed

1

1

 

Estimated value

  

4.0

1

3

 
  1. *l, w, τ, and V r denote the length, width, rise time, and rupture velocity of EGF1 and EGF2, respectively.
  2. **NSL and NSW indicate the rupture starting subfault within SMGA in the strike and dip directions.