The extension of the 186-year period back to A.D. 0 is confirmed.
The presence also of an effective, probably composite, period of 93 years.
The periodic increase of activity, number of shocks, to a sharp maximum followed by a sudden and often nearly complete cessation of activity.
Double, very marked maxima with increasing separations, in double the 186-year period.
A high degree of homogeneity in these early records, and their entire suitability for exacting investigation.
The large number of lunar and lunar-solar periods present in seismic activity establish gravitation as in general the underlying cause of these ruptures.
Similarity of minor details which indicate the presence of other, shorter, lunar periods.