The seismological situation in the zone of Avacha Bay is found to be similar to that within the second kind of the seismic gap during the precursory seismic quiescence of the 1978 Oaxac earthquake with M = 7.8 in Central Mexico.
Such a result can be considered as a suggestion of the possibility of the occurrence in Avacha Bay of an earthquake with M ～ 8 according to the long-term forecast for the region of the Kuriles and Kamchatka made by S.A.
From these we learnt that, in Shanxi fault-depression system, the run-through activity of two boundary faults of depression-basins might generate great earthquake with M=8.
Table 2 indicates that on average New Zealand normally experiences an earthquake with M $ 7.0 about every8 years.
The seismogenic source located in Eastern Nepal region, which has been the site of 1934 Bihar-Nepal great earthquake of M 8.4, is presently experiencing N-S to NE-SW directed compressive stresses.
Considering both the result of inversion and tectonic environment around the source, the first rupture might result from the extension along the NNW directed Zhongdian-Yongsheng fault belt where an earthquake of M=6.4 occurred in 1966.
Among the five earthquakes, the quake of M=7.3 on September 16, 1994 in Taiwan Strait is the strongest one in the southeastern coast area since Nan'ao earthquake of M=7.3 in 1918.
It is generally accepted that the 1969 Bohai earthquake of M=7.4 and the 1975 Haicheng earthquake were not triggered by the tidal force.
The result shows that decades or even one hundred years is the common value for a great earthquake of M=8.0, 30 years for one with magnitude about 7 and 20-30 years for a strong quake of M=6.0.