THE GREAT ERUPTION OF SAKURA-JEVIA IN 1914. 147 



western field occupying an area of 7.202 sq. km. with volume of 

 0.2881 cub. kw. (p. 107). Sec Sketch-map, Text-fig. 19. 



A.t the western slope of the North Cone between the knob of 

 Hikino-hira and the parasitic cone of Furuhata, there was a cul- 

 tivated talus slope at the upper limit, at about an altitude of 

 300 VI., and there are a few ancient vents, one of which being the 

 Yuno-hira, as may be seen on Map and in all the pictures of the 

 western side. The Hikino-hira and Furuhata lavas are scars left 

 from old wounds and the spots mark the weak portions of the 

 old volcanic body. 



The slope between them is entirely changed in relief, a large 

 cauldron having been formed with a margin of concentric terraces, 

 each separated by gaping and fuming lines of fissures,^^ as can 

 be distinctly seen in the background of the pictures in Pis. XIV.-XV. 

 Then from the engulfed and collapsed bottom rose a gigantic 

 * live ' dome, not unlike those of Tarumai of Japan and Bogosloß" 

 of the Aleutian Islands. An excellent view of the smooth, bulging 

 dome of lava from the north side in Text-fig. 28, taken 7 days 

 after its birth, can tell the story bettor than words can depict. 

 On seeing the successive slipping on the background of the figures 

 in Pis. XIV.-XV. it soon suggested to the mind, that the solid 

 ground was stoped and assimilated by ascending lava underneath, 

 and the syntectic magma so formed contributed to the substance 

 of the outwehed cupola. '^ 



1) In a verbal commimicalion by Prof. F. Ômori, wlio visited the region in April, 1915, 

 fifteen months after the spasm, he said that he had actually seen within one of the gaping 

 fissnres here cited, a still fresh red-hot lava-ton// cf about 15 feet below. His important ob- 

 servation gives weighty corroborative e%àdence in siipport of the writer's assertion that the 

 lava in the local reservoir either stoped or assimilated the wall upwards, leaving only a thin 

 margin of old surficial crust. Or, it may be assumed that the ramifying lava tongiies simply 

 ran into open fissiires from a local reservoir by hydrostatic i^ressure. 



2) It is not unlike Daly's " foundering " eruption. He says this type of eruption is con- 

 ditioned by stoping and assimilation of bathoUthic magma, but in the present case we have 

 before us the melting of the thin roof of a satellitic chamber. 



