THE GREAT ERUPTION OF SAKURA-JIMA IN 1914. 



169 



Fig. 35.— Vents No. 3 :xud 1 in tlie same liiva-tiekl as in Text-fig. 34. 



the lava-field called Byôbu-hira or Shibano {see Geologic Map) in 

 a south by southwestern direction. Though comparatively small 

 in size, especially Nos. 2-4, these ventholes must have displayed 

 tremendous phenomena in detonating and throwing up cloud dust, 

 just as recent ones have done and are still doing on both flanks 

 of Sakura-jima. We find no particulars of their activity on record. 

 Tlie v/riter is not cei'tain whether all these represent the vents on 

 the body of the mountain. Some may be secondary vents formed 

 by the escape of accumulated gases within the fluent lava stream. 

 A well-defined venthole lies between the 100- and 200-metre 

 counter lines. It is the Takachiki vent (Geologic Map, No. 0, i^), 

 and it probably poured forth the fluent lava which ran down to 

 the sea forming Cape Moyé-zaki. 



b) Pétrographie Characters of Pyroxene-andesite.— The lavas are 

 identical with those of Urano-mayé (p. 165), although they occupy 



