P. Nyffenegger et C. Frohlich, Aftershock occurrence rate decay properties for intermediate and deep earthquake sequences, GEOPHYS R L, 27(8), 2000, pp. 1215-1218
We perform a detailed analysis of seven aftershock sequences with intermedi
ate- or deep-focus main-shocks occurring in the Aleutian Islands, Japan, th
e Pamir-Hindu Kush (PHK), Tonga, and Bolivia. For each sequence we determin
e the modified Omori law (MOL) p value and goodness of fit. For all sequenc
es, we are able to find a time interval where the sequence conforms to MOL
decay with either c = 0 or c variable. The two sequences with deep-focus ma
inshocks have slightly larger p values than the intermediate depth sequence
s. Despite the rarity of well defined intermediate or deep aftershock seque
nces, neither the observed p values nor the overall sequence decay behavior
significantly differ from that observed for shallow sequences.