302 



Sierra Club Bulletin 



No. Date 



Time 



Character of 



Duration 



Crater Size 



Thur. 7/16 



Thur. 7/16 



Fri. 7/17 



Fri. 7/17 



Sat. 7/18 



Mon. 8/10 



Wed. 8/19 



Fri. 8/21 



Sat. 8/22 



Sat. 8/22 



Sat 8/22 



Sun. 8/23 



Sun. 8/23 



Sat. 9/5 

 Sat. 9/5 



12 :30 am 

 4 130 am 

 6 :oo am 



II :47 am 



5 :28 am 



5 -30 pm 

 7 :24 am 



11 :io am 



8 140 am 



12 :4o pm 



4:35 pm 



6 :33 am 

 7 :43 pm 



12 :23 pm 

 4 :25 pm 



Very heavy. Vol- 

 canic dust fell at 

 Mineral 



Heavy eruption 



Heavy eruption. 

 Volcanic ash fell 

 at Mineral 



Heavy eruption 



By far most violent 

 eruption to date, 

 Ash, steam, etc., 

 rose to height of 

 11,000 feet. 



Medium. Small 

 quantity ash 



Very heavy. Huge 

 clouds ash thrown 

 out. Height 10,500 

 feet 



One of the largest 

 eruptions to date. 

 Entire crater ac- 

 tive. Height 10,500 

 feet 



Heavy. Ash col 

 umn shot up ob- 

 liquely instead of 

 vertically, as in all 

 former eruptions 

 Altitude, 7,590 ft. 



Heavy. Entire cra- 

 ter active. Height 

 5,940 ft. 



Medium. Height, 6,- 

 000 ft. 



Medium. Height, 5,- 

 610 ft. 



Larger than morn- 

 ing disturbance. 

 Height, 5,940 ft. 



Medium. Full 

 length crater ac- 

 tive. Height, 5,600 

 ft. 



Medium. Larger 

 quantities ash than 

 morning eruption. 

 Height, 4,950 ft. 



Intermit- 

 tently thru 

 early morn- 

 ing hours. 



Several hrs. 



Several hrs. 

 Several hrs. 



Practically 

 entire 

 morning. 



Continued 

 after dark. 



4 hours. 



I hr. 40 min 



I hr. 20 min. 



55 min. 



I hr. 53 min, 



Continued 

 after dark. 



4 hours. 

 I hr. 35 min. 



605 X 208 ft. 

 C. H. Lee's 

 measure- 

 ment. 



