624 



Jaggar — Activity of Mauna Loa. 



ing a sudden cessation in seismic activity. In the first half of 

 1915 the seismioity has been normal. . 



All the evidence accumulated concerning this summit out- 

 break of Manna Loa shows that the main eruption expended 

 itself during the first twelve hours in aline of tremendous lava 

 fountains rising through a rift in the crater floor and probably 

 spouting to heights over five hundred feet in some instances. 

 No one saw the fountains from the rim of the crater during 



Fig. 3. 



Fig. 3. Mauna Loa and Kilauea from east rim of Kilauea crater Nov. 26. 

 1914, 12.30 a. m. The width of the fume column in Mauna Loa calculated 

 from measurement of photograph was 7300 feet, or approximately 1'4 miles ; 

 the distance 116,250 feet or 22 miles. South is on the left. T. A. Jaggar, 

 phot. 



the first two days, and it is probably no exaggeration to assert 

 that no one has ever seen an outbreak of Mauna Loa from a 

 viewpoint close at hand. These first twelve hours presented a 

 spectacle quite different from what was seen by Palmer and 

 Forrest on the third day, for those observers reported spatter 

 heaps of large size beside dwindled fountains which had built 

 them, and night photographs taken by the writer November 

 26* and November 27 under like conditions of distance, light 

 * This Journal, Feb. 1915, page 165. 



