Abstract
The seismic intensity obtained from Aomori seismic intensity information network (ASIIN) is compared with K-NET data. K-NET sites which are located near the ASIIN stations and have same geological condition to that of ASIIN are chosen. We first compare the difference of seismic intensity by ASIIN and K-NET, then calculate spectral ration between them. The absolute value of the difference is smaller than 0.2. Shape of the spectral ratio is almost same without depending on a station. The ratio is almost unity from 0 Hz to 4Hz, while there is a peak around 5 Hz. In the range of frequency which is higher than 5 Hz, spectral ratio decays gradually. We also check the effect of the foundation and case vibration on the records of ASIIN.
