rjS Vol. XLIII., Art. ß. — S. Tsuboi : 



Mardi 1912 CH^fèKi-5:^P) till May 1914 (:fcjEH^). Daring this 

 eruption, several experts^-* visited the island and reported in detail 

 tlieir observations on the actual state of the eruption. 



Lavas were extruded in five periods with short intervals of 

 quietude between each two successive periods. They did not run 

 over the brim of the Mihara crater but they changed the state of 

 the inside of the crater. 



As a premonitory symptom, slight roarings were frequently 

 lieard as early as in 1910. 



The first activity began with the pouring out of lava from a 

 vent at the crater bottom in March 1912 and terminated on June 

 10. During this interval, lava was raised to a level of 62 on. 

 below Kawajiri^^ (the lowest point of the upper margin of the 

 craten* wall of Mihara, K in Figs. 18-20), half burying Naumann'» 

 cone, while a small new spatter cone — Nakamura's cone''^ — was 

 formed on the surface of the lava layer, somewhat to the south- 

 west of the centre of the crater -bottom. 



On July 27, a sudden depression of the consolidated lava 

 layer took place, due to its own weight, leaving the peripheral 

 part in the form of a terrace. This accompanied the breaking up 

 of Nakamura's cone and the squeezing out of a new lava, from 

 July 27 to 29, from the clefts and cracks that traversed the lava 

 layer. 



The volcano broke out again in a remarkable eruption on 



1) Omoet, " Preliminary Rei^ort on tlie Eruption of Volcano Mihara," Report Earthq. Invest. 

 Com., No. 81, 1915 (in Japanese). 



Nakamuea, " The Eruption of Volcano Mihara, Osliima, Iclzu," Tôijô Qakugei Zussld, 

 Nos. 368 A' 369, 1912 (in Japanese). 



Sato, " The Present ActiA-ity of the Mihara Volcano,"' Juur. Geogr. Tokyo, No. 289, 1912 

 (in Japanese). 



Okairtka, " Report on the Eruption of Volcano Mihara," Jrleiwrt G'eol. Surv. Japan, Na_ 

 48, 1914 (in Japanese). 



2) )]\K 3) tfi^Oj 



