| Abstract |
The previous studies (Saito et al. :1985, 1987a,1987b) showed that the seismic noise in the frequency band 215Hz was observed in an area centered in the recent development zone of Kakkonda geothermal area, which is generated by the stream of steam and hot water going upwards from a deeper geothermal reservoir to the surface. Based on these facts, a seismic noise survey was carried out in the eastern part of Hachimantai geothermal area, northeast Japan, in 1987. The relation between the noise amplitude, distribution of dominant frequency and geothermal activity was investigated. |