1982 年 91 巻 4 号 p. 217-238
Spatial and temporal relations between large interplate earthquakes and eruptive activities along Northeast Japan was studied by means of a two-dimensional model using the finite element method. Stress fields were calculated using seismological data in Northeast Japan. The stress value for each earthquake was normalized by using the seismic moment Mo instead of earthquake magnitude M. Stress differences before and after great earthquakes show close relationships with eruptive activities in Northeast Japan. The results suggest that eruptive activities increase under the increased compressive strain of pre-seismic conditions and their activities abruptly decrease under post-seismic conditions.