36 EARTHQUAKES ON THE PACIFIC COAST 



1843. September 28; 



Eruption of Mt. St. Helens, Oregon. — Perrey. [?] 



1842. November 23; 



Eruption of Mt. St. Helens.— Perrey. (1843?) [?] 



1842. 



Eruption of Mt. Baker, W. T.— Perrey. [?] 



1843. June 23; 3:30 p. m,; VIH? or more severe? 



Very severe earthquake in California, which, extended to Mexico. — 

 Perrey. 



1843. November 23; 



Eruption of Mt. Eaynier. — Perrey. (See 1842, November 23, and 

 1841.) [?] 



1843. 



Eruption of Mt. Baker, Oregon. — Perrey. [?] 



1846-52; exact date not given. 



In Oregon City, on Eock Creek, near Portland, Oregon, explosions 

 like those of a cannon were heard for nearly the whole of a day. 

 At first these were about half an hour apart; then they came 

 nearer together, until at last they were no further apart than one 

 minute or so; finally they died away. The water in Eock Creek 

 did not run for three days.— Verbal account of Geo. J. Ainsworth, 

 Esq. 



1847. VI. 



St. Paul's Island, Alaska. — P. 



1S4S. January 4; III. 



Slight shock at Los Angeles. — B. Ms. 



1849. September 16; evening. 



At Santa Isabel, betAveen San Diego and the mouth of the Eio Gila, 

 —Perrey. 



1849. September 22; 3 p. m. 



Twelve miles from Curisco Creek, in the desert between Santa Isabel 

 and the Gila. — Perrey. 



1850-1854. 



" A Eecent Volcano in Plumas County, Cal." by Dr. H. W. Harkness. 

 Dr. Harkness describes his visit to a spot near the borders of 

 Lassen and Plumas counties, directly across the northern end of 

 Snag Lake (Lake Anna), twelve miles east of Lassen's Butte, and 

 gives his own observations, showing a recent eruption, together 

 with the evidence of other persons, all going to prove an active 

 eruption about 1851.— Proc. Cal. Acad. Sci., vol. 5, pp. 408-412. 



