p values of continental aftershock activity in China

The temporal attenuation characteristics of the frequency of aftershock activity for 32 earthquakes (M being more than or equal to 5) were quantitatively analyzed by using the maximum likelihood estimation for point process. The results indicated that the average value of the attenuation coefficient of aftershock activity (p-value in the modified Omori’s formula) of the East China and the North—South Seismic Belt of China (NSB) was 0.91, being less than thep value of the western China. Comparing thep values of aftershock activities in the continental part of China with those in the Japanese islands, it was found that thep value in the continental part of China was less than that in the Japanese islands. Wherewith thep value is not related to the magnitude of main shock.