Abstract
First, it is emphasized that epicenters of large earthquakes are not the centers of source regions, but only starting points of large fractures called“earthquakes,”so that it is only natural that the relations between locations of epicenters of large earthquakes and the intensity distribution due to these earthquakes are very peculiar in some cases.
Secondly, it is pointed out that the strong correlations can be seen between intensity distributions and aftershock areas as in the case of the Tonankai earthquake on 7 December 1944, because the latters can be considered as the fracturing areas due to the earthquakes concerned.
Thirdly, in more detailed discussion, it is pointed out that aftershock area which show the strong correlations with intensity distributions are not the whole aftershock areas but the area of concentrated aftershock energy where only direct aftershocks in the present author's definition take places.
Lastly, some related geophysical and seismological features are briefly discussed.
