|
| | Abstract | | Tachikawa fault is one of the most activity faults in the Tokyo metropolitan area and when large earthquake will occur by this fault in the near future, it is expected that large economic and human loss will happen around this area. However, three dimensional subsurface structural model is not clear still enough for the estimation of the strong ground motions in this area. In this study, we estimated the three dimensional subsurface structural model using the receiver function method from the obtained records of the K-NET, KiK-NET and SK-net. The 60 earthquake ground motion stations were used in this area. We calculated the receiver functions from 20 to 50 seismic records obtained at each station, and we identified the subsurface structural model using inversion based on the simulated annealing method. Based on numerical experiments it is indicated that thickness of individual layers are inverted very well. Moreover, we constructed the three dimensional subsurface structural model in this area obtained from P-wave and S-wave velocity profiles of thick sediments at each station. The results indicate that a basement depth in those profiles at down-thrown side of the fault is larger than that at up-thrown side with a difference of about 1.8km. |
|
|
|
| |
|