ハワイ火山噴火と地震に関する統計的考察 II

抄録

An attempt was made to discover any statistical relation of earthquakes as premonitory phenomena to volcanic eruptions on the basis of reports of the Hawaiian Volcano Observatory. The results seem to be negative. However certain factors must be kept in mind. First, seismic activity was tabulated according to the method of weekly local seismicity, an unique method employed in Hawaii. Secondly, the data used were obtained from low-powered seismometers. Hence, the possibility of seismic activity serving as premonitory phenomena of eruptions is still not excluded. It is then inferred that for further investigations seismometers of higher magnifications are necessary and consonantly a better way of tabulating seismic activity must be devised. It has also been found that there is a definite statistical relation between the frequency of earthquakes and their strength.