|
| | Abstract | | We study about an estimation error on average S-wave velocity (AVS) by using only two stations records in a circular or triangular array which has been performed in Tachikawa-Fault zone. First, we investigate the relationship between AVS and the phase velocity which correspond to AVS to easily estimate AVS using that wavelength. Then we applied SPAC method to the previously measured microtremors array data by supposing only two stations records were measured. The comparison between AVS30 estimated using two stations records and actual AVS30 showed better correlation than the AVS30 estimated from geomorphological information especially, bias was reduced. Similar investigations for AVS5, 10, 20 and 50 indicate that estimation error on AVS5 exhibits low standard deviation. We found the possible cause of large estimation errors occurs in the process of estimation of AVS using the wavelength of which phase velocity corresponds to AVS, but not the influence of the limitation of the number of stations. |
|
|
|
| |
|