THE OREAl^ EllUPTION OF SAKURA-JIMA IN 1914. 101 



silent aiul at last, four days later, the memorable eruption at 

 Sakura-jima occurred. 



The above conclusion concerning the maximal frequency of 

 the earthquakes, which responded to the subterranean activity of 

 Sakura-jima, namely that this frequency, prior to the great vol- 

 canic catastrophe, had some relation with the maximal period of 

 the local atmospheric pressure, is verified by the following facts. 

 According to the ' Report of the Meteorological Observatory in 

 Kagoshima,' the daily frequency of shocks has been high between 

 >>-9 A.M. and 8-0 p.m., corresponding to the pressure-maxima of 8-9, 

 9-10 A.M., and 8-9, 9-11 p.m. Sakura-jima also burst out on January 

 12th, 10.5 A.M. after the maximal period of local atmospheric pres- 

 sure. The writer could not find any relation between the direction 

 of pressure gradient and the oè^urrence of shocks. 



iii. The Phases of Eruptions. — F. Omoei {I.e. p. 57) tabulated his 

 tromometer observations, carried out under his direction in the city 

 of Kagoshima and in Sakura-jima, the registration being started 

 on the 16th, and the writer reproduces it hero in order to explain 

 various phases of activity recorded in his diary (pp. 56-95). 



The first phase of the Sakura-jima eruptions passed away 

 during Jan. 12th to 13th. The second phase (p. 73) was ushered 

 in on the 14th, continuing till the 20th. On examining the second 

 column, the eruptions of the first order were 60 in daily average 

 from 16th to 20th, these numbers being decidedly the joint records 

 0Î the eruptions of both the western and the eastern vents. From 

 the 21st the western vents came to a standstill, while the macro- 

 scopic lava movement of the west came to rest only on the 27th. 



From 21st to 27th — the interval of the third phase (p. 87), 

 the daily average of outbursts was 30 and they were recorded 

 from the eastern vents only, while the macroscopic lava-flowage 



