88 



H. Simotomai — TaTiimai Dome in Jajpan. 



Several eruptions are recorded in history, but tliej have few 

 direct bearings on the present discussion. From 1896 until 

 the beginning of 1909 the volcano was quiet. In the latter 

 year, between January and March, small activities were noted 

 eight times by the inhabitants of the territory in the form of 

 ash-rain, fire phenomena, detonation, and earthquake. On the 

 30th of March a tremendous explosion took place, throwing 



Fig. 1. 



Fig. 1. The location of Tarumai Volcano. 



out ashes, bombs, lapilli, etc., and therewith a smoke column 

 about 7 km. high rose from the volcano. On April 4:th Oinoue 

 visited the mountain and saw a new, deep, fuming pit on the 

 floor of the crater bottom. On April 12th another explosion 

 occurred in full violence, accompanied by ashes, bombs, lapilli 

 of several sizes, and an enormous smoke column. The sur- 

 rounding inhabitants did not notice any change on the moun- 

 tain until April 19th; when, the cloud clearing up, a dark 

 elevation on the summit came in sight. Indeed, a dome of augite- 

 andesitic lava was rising in the inner crater. On April 23d 



