142 AET. 3. — B. KOTO : 



scattered and the paroxysmal activity was concentrated in No. 2 



— the Yuno-hira crater. 



yentholes rj^^^Q j-f^Qj^ castcm ventliolcs, in contrast to tlie 



ON THE 



^^^ irregular distribution of the western, are arranged in 



straight line {sec Sketch-map, Text-fig. 10) irrespective of topography, 

 from northwest by west to southeast by east. This distinct 

 alignment of orifices marks the trend and location of fracture in 

 the superstructure of the volcano, and apparently justifies the 

 hypothesis on tlio existence of a tectonic line in that direction 

 through the whole mountain. During the first phase, the sight of 

 the glare at night observed by the writer was a splendid one. 

 When one of the vents, either No. 3 or 4, made an outburst, the 

 rest readily followed and sympathized with the forerunner together 

 with minor vents, and the general awakening of fiery torclies 

 ensued one after another, finally fusing together in the form of a 

 carmine-red wair^ of hellish blaze, as if hot lava was running 

 along and underneath the fracture line (Text- fig. 14 [c]). 



Comparing the position of orifices noted during two trips, 

 one in January, 1914, the other in April of the same year, some 

 changes had occurred (Text- fig. 19) ; No. 1 and those marked with 

 small circles on the southern slope of Nabé-yama had been 

 rather active during the first phase, though they later became 

 dormant. The order of their birth according to the writer's opinion 

 was as follows : 



The activity started with the lava-flow at No. 1 (Text-fig. 19), 

 tlie Sen-yemon recess popularly so called, which soon became ex- 

 hausted, and then shifted to No. 2, and the one near by (not in- 

 dicated in Text-fig. 19) was a contemporary. Nos. 3 (250 m) and 4 

 then followed, and displaj^ed vulcanicity on a grand scale with 



1) A continuous glare appeared before the outwelling of fluent lava. 



