THE GEEAT ERUPTION OF SAKUEA-JIMA IN 1914. 23 



volcano, wo have first of {ill to consider tlie mainland that lies close 

 to it, and this the writer believes to have done in the preceding pages 

 (pp. 13-20) in connection with the discussion on the geology and 

 the origin of Kagoshima Bay in which Sakura-jima is situated. 



As already remarked, the bottom of the trench bay of Kago- 

 shima was multifariously slmttered (p. 20), leaving some polygonal 

 blocks as if they were wedged out from the rest of the members. 

 The tectonic movement was therefore similar in kind to that, by 

 which plateaus are usually produced. These uplifted blocks are the 

 low flat islets^^ of Oko-jima (40 m.)p Hakama-goshi (72 y«.),''^ the 

 low Kanzé, the lava-drowned Karasu-jima,^^ and Ko-jima,^^ the last- 

 named being at tiie nortli end of the bay. The bottom is 100 

 fathoms deep, and is a part of the continental shelf. The geology 

 of these islets is interesting in many ways ; firstly, they were 

 never closely studied before, and secondly, they give some clues 

 as to the nature of the foundation of S a k u r a - j i m a. 

 Oko-shijia 1) Oki-kojima (spokcu Ohosliimci) lies on the south- 



west coast of Sakura-jima (Geologic Map ; PL III. Fig. 1), near 

 Moyé-zaki (the ' burning cape ') — the lava-end of the eruption in 

 1475-147G. It is only 400 m. long by 200 m. broad. It rises from 

 the bottom (10 fathoms deep, and its flat top (40 m.) is GO m. 

 lower than that of the ancient citadel of Kagoshima. It is said''^ 

 to be a part of the lava-flow of 147(), which was later severed 

 fi-om the land by a depression of the intervening sea bottom ; 

 but this story is entirely unfounded (p. 42). 



1) The new isLands off the northeastern shore of Siilair.i-jimn, formed during und after 

 the eniption of 1779, will be dealt with elsewhere {]}. d8), since these historic islands form a 

 special group by themselves. 



•2) i^ ^h h !^e Geologic Map. 3) :ff fg or Shiro-yama (Mc lij) 4) .0? % 5) /J. 

 ^ It lies outside the limit of the annexed Geologic IMap. 



6) 'Compendium of Geography of Satsuma, Ôsumi and Hyûga,' Kagoshima. ^ P^ H üi ?1 



